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Physic
Q:
A softer landing occurs when an falling object bounces from a surface
A) in a extended time.
B) quickly.
C) either of these
D) neither of these
Q:
A karate chop is more effective if one's hand
A) follows through upon impact.
B) bounces upon impact.
C) extends the time upon impact.
Q:
The greater efficiency achieved with the curved blades of a Pelton wheel is due to
A) bouncing.
B) greater time of water impact.
C) rotational momentum.
D) divided impulse.
Q:
As Bronco Brown steps off a hovering high-flying helicopter and falls through the air, he experiences
A) an impulse.
B) an increasing speed.
C) a decreasing acceleration.
D) all of the above
Q:
A bungee jumper attains a speed of 30 m/s just as the bungee cord begins to stretch. If the period of stretch is 2 s while coming to a halt, the jumper's average deceleration is about
A) 0.5 g.
B) g.
C) 1.5 g.
D) 2 g.
Q:
A falling 1-N apple hits the ground with a force of about
A) 1 N.
B) 2 N.
C) 4 N.
D) 10 N.
E) need more information
Q:
The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is
A) 1000 N.
B) 2000 N.
C) 3000 N.
D) 4000 N.
E) 5000 N.
Q:
The force that accelerates a rocket in outer space is exerted on the rocket by the
A) rocket's nose cone.
B) rocket's wings.
C) atmospheric pressure.
D) exhaust gases.
E) none of the above
Q:
A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is
A) greater.
B) smaller.
C) the same.
Q:
A tiny gun made of a strong but very light material fires a bullet more massive than the gun itself. For such a weapon
A) the target would be safer than the shooter.
B) recoil problems would be lessened.
C) conservation of energy would not hold.
D) conservation of momentum would not hold.
E) both conservation of energy and momentum would not hold.
Q:
A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the
A) force against the cannon is smaller than against the ball.
B) momentum is mainly concentrated in the cannonball.
C) cannon has much more mass than the cannonball.
D) momentum of the cannon is smaller.
Q:
When a boxer is moving away from a punch, the force experienced is reduced because
A) momentum transfer is reduced.
B) the time of contact is increased.
C) the force is less effective.
D) all of the above
Q:
When a boxer moves into an oncoming punch, the force experienced is
A) decreased.
B) increased.
C) no different, but the timing is different.
D) all of the above
Q:
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
A) greater with the haystack.
B) greater with the brick wall.
C) both the same
Q:
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is
A) greater with the haystack.
B) greater with the brick wall.
C) both the same
Q:
Which produces more force: driving into a very massive concrete wall with no "give," or having a head-on collision with an identical car moving toward you at the same speed?
A) car
B) wall
C) both the same
D) need more information
Q:
A karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force on her hand is
A) zero.
B) less than the force applied to the cement block.
C) the same as the force applied to the block.
D) more than the force applied to the block.
E) need more information
Q:
If you can't avoid being hit by a fast-moving object, you'll suffer a smaller contact force if you can extend that force over a
A) longer time.
B) shorter time.
C) both the same
Q:
When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of the contact about 10 times that of a stiff-legged landing. In this way the average force your body experiences is
A) less than 1/10 as great.
B) more than 1/10 as great.
C) about 1/10 as great.
D) about 10 times as great.
Q:
To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because the
A) force of contact is reduced.
B) relative velocity is less.
C) time of contact is increased.
D) time of contact is decreased.
E) none of the above
Q:
Compared with falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the
A) carpeted floor provides a smaller impulse.
B) stopping time is shorter on the carpet.
C) stopping time is longer on the carpet.
D) carpet provides a smaller impulse and a longer time.
Q:
When Peter tosses an egg against a sagging sheet, the egg doesn't break due to
A) reduced impulse.
B) reduced momentum.
C) both of these
D) neither of these
Q:
The force on a dropped apple hitting the ground depends upon
A) the speed of the apple just before it hits.
B) the time of contact with the ground.
C) whether or not the apple bounces.
D) all of the above
Q:
Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting the dashboard encounter
A) lengthened time of contact.
B) shorter time of contact.
C) decreased impulse.
D) increased momentum.
Q:
A car traveling along the highway brakes to a stop over a certain distance. More braking force is required if the car has
A) more mass.
B) more momentum.
C) less stopping distance.
D) all of the above
E) none of the above
Q:
The impulse-momentum relationship is a direct result of
A) Newton's 1st law.
B) Newton's 2nd law.
C) Newton's 3rd law.
D) Newton's law of gravity.
Q:
It is correct to say that impulse is equal to
A) momentum.
B) a corresponding change in momentum.
C) force multiplied by the distance it acts.
D) velocity multiplied by time.
Q:
A motorcycle of mass 100 kilograms slowly rolls off the edge of a cliff and falls for three seconds before reaching the bottom of a gully. Its momentum upon hitting the ground is
A) 1,000 kg m/s.
B) 2,000 kg m/s.
C) 3,000 kg m/s.
D) 4,000 kg m/s.
E) 9,000 kg m/.
Q:
If several balls are thrown straight up with different initial speeds, the quantity that will have the same value along their paths is their
A) initial momentum.
B) maximum height.
C) time of travel.
D) acceleration.
E) none of the above
Q:
The total momentum of a flock of identical birds could be zero only if the birds are
A) taking off from the ground.
B) flying in the same direction.
C) flying in different directions.
D) very tired and coming down to rest.
Q:
A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will likely have
A) less momentum.
B) about the same momentum.
C) more momentum.
Q:
The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is
A) 4 kg.
B) 12 kg.
C) 16 kg.
D) 144 kg.
E) none of these
Q:
The speed of a 4-kg ball with a momentum of 12 kg m/s is
A) 3 m/s.
B) 4 m/s.
C) 12 m/s.
D) 48 m/s.
E) none of the above
Q:
A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
A) speed.
B) acceleration.
C) momentum.
D) all of the above
E) none of the above
Q:
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is
A) zero.
B) twice.
C) four times as much.
D) unchanged.
Q:
Which of the following has the largest momentum relative to Earth's surface?
A) a tightrope walker crossing Niagara Falls
B) a pickup truck speeding along a highway
C) a Mack truck parked in a parking lot
D) the Science building on campus
E) a mouse running across your room
Q:
Which has the greater momentum when moving?
A) a container ship
B) a bullet
C) either of these depending on speed
Q:
A river 100 m wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water leaves the west bank. To land at a point due east of its starting point, the boat must be pointed
A) northeast.
B) east.
C) southeast.
D) nowhere"it can't be done.
Q:
A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat crosses in
A) 50 s.
B) 100 s.
C) 141 s.
D) 200 s.
Q:
A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is greater than 90o, their resultant is
A) less.
B) the same.
C) greater.
Q:
A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is less than 90o, their resultant is
A) less.
B) the same.
C) greater.
Q:
The airspeed of an airplane is 200 km/h. When it is caught in a 200-km/h crosswind, its speed across the ground below is
A) 0 km/h.
B) 200 km/h.
C) 283 km/h.
D) 400 km/h.
E) 1600 km/h.
Q:
An airplane travels at 141 km/h toward the northeast. What is its component of velocity due north?
A) 41 km/h
B) 100 km/h
C) 110 km/h
D) 141 km/h
Q:
Nellie tosses a ball upward at an angle. Neglecting air resistance, the vertical component of the initial velocity
A) decreases with time to reach the top.
B) remains constant.
C) increases with time to reach the top.
Q:
Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity
A) decreases with time.
B) remains constant.
C) increases with time.
Q:
Three kids pull on a toy. Kim pulls with a force of 30 N north, Jim pulls with a force of 30 N south, and Tim pulls with a force of 15 N east. The acceleration of the toy is
A) 10 m/s2.
B) 15 m/s2.
C) 33 m/s2
D) need more information
Q:
When Monkey Mo is suspended at rest by holding a rope with one hand and the side of his cage with the other, all the force vectors that act on him
A) have equal magnitudes.
B) cancel except for his weight vector, mg.
C) have a vector sum of zero.
Q:
As the sloped surface supporting a shoe becomes steeper
A) the shoe's weight mg remains unchanged.
B) the normal force becomes less.
C) friction needed to keep it at rest increases.
D) all of the above
E) none of the above
Q:
A shoe on an inclined surface barely remains at rest when friction equals the
A) weight mg of the shoe.
B) component of mg perpendicular to the surface.
C) component of mg parallel to the surface.
D) none of the above
Q:
The normal force that acts on a block of ice that slides on a ramp
A) is equal to mg at all angles.
B) decreases as the slope of the ramp increases.
C) becomes greatest when the ramp is vertical.
Q:
The force due to gravity that acts on a block of ice that slides down an icy ramp
A) remains equal to mg at all angles.
B) decreases as the slope of the ramp increases.
C) becomes greatest when the ramp is vertical.
Q:
Art museums use weaker wires than those used in homes because paintings in museums
A) are suspended by pairs of vertical wires.
B) are usually lighter in weight.
C) are more firmly attached.
Q:
When Nellie hangs suspended from a pair of ropes that are not vertical, the tension in each rope is
A) less than half her weight.
B) half her weight.
C) more than half her weight.
D) her weight.
Q:
Nellie's weight and normal force usually have the same magnitude when she stands on a
A) horizontal surface.
B) inclined surface.
C) either a horizontal or inclined surface.
Q:
A 10-unit vector at 60o from the vertical has a vertical component with a magnitude
A) less than 10 units.
B) 10 units.
C) greater than 10 units.
Q:
Nellie Newton pulls her sled by a rope that is 45o to the horizontal. The horizontal and vertical components of force are
A) equal in magnitude.
B) each about 0.7 times the force she exerts on the rope.
C) both of these
D) neither of these
Q:
Two equal-size vectors at right angles to each other have a resultant that isA) equal to that of either vector.B) 2 the length of either vector.C) twice the length of either vector.
Q:
A vertical vector of 3 units combined with a horizontal vector of 4 units has a resultant of
A) 1 unit.
B) 5 units.
C) 7 units.
Q:
If vertically falling rain makes slanted 45o streaks on the side windows of a moving car, the speed of the car
A) is less than the speed of the falling drops.
B) equals the speed of the falling drops.
C) exceeds the speed of the falling drops.
D) need more information
Q:
You stand on your skateboard and exert a 50-N push on the wall next to you. If your mass is 60 kg you'll momentarily accelerate from the wall at about
A) 0.08 m/s2.
B) 0.8 m/s2.
C) 8.0 m/s2.
D) none of the above
Q:
An astronaut of mass 70 kg weighs 700 N on Earth's surface. His weight on the surface of Mars, where the acceleration due to gravity is 3.7 m/s2, would be about
A) the same as on Earth.
B) 130 N.
C) 260 N.
D) 370 N.
E) none of the above
Q:
When a rocket forces exhaust gases downward, the exhaust gases
A) as the name implies, soon exhaust their influence.
B) play no further role in the motion of the rocket.
C) exert an upward force on the rocket.
Q:
When a cannonball is fired from a cannon, which undergoes the greater acceleration?
A) the cannonball
B) the recoiling cannon
C) both the same
Q:
The force that propels a cannonball when fired from a cannon is
A) huge compared to the recoil force on the cannon.
B) equal and opposite to the force the ball exerts on the cannon.
C) in some cases, equal and opposite to the force the ball exerts on the cannon.
Q:
A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. Acceleration will be greater for the
A) heavier car.
B) lighter car.
C) same on each.
Q:
A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the
A) heavier car.
B) lighter car.
C) same on each.
Q:
Earth pulls on the Moon, and the Moon pulls on Earth, which tells us that
A) these two pulls comprise an action-reaction pair.
B) both Earth and Moon circle a common point.
C) more massive objects pull harder.
D) all of the above
Q:
The force with which Earth pulls on the Moon is
A) somewhat greater than Moon's pull on Earth.
B) the only force acting between Earth and Moon.
C) equal in magnitude to the force that Moon pulls on Earth.
Q:
The attraction between Earth and Sydney is equal to her weight. The reaction to Earth's pull on Sydney is
A) Sydney pushing against Earth's surface.
B) the support of Earth's surface on Sydney.
C) Sydney's pull on Earth.
D) none of the above
Q:
Joshua is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Joshua with a force of
A) zero.
B) 250 N.
C) 500 N.
D) 1000 N.
Q:
A pair of air pucks on an air table are set in motion when a compressed spring between them is released. If one puck moves with twice the speed of the other, then its mass is
A) half the mass of the other.
B) the same mass as the other.
C) twice the mass as the other.
D) need more information
Q:
As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the
A) air resistance acting against the ball.
B) acceleration of the ball.
C) ball's pull on Earth.
D) none of the above
Q:
When a tennis racquet hits a ball,
A) the racquet loses as much speed as the ball gains.
B) the ball is set in motion with the same speed of the racquet upon contact.
C) the ball hits the racquet.
D) all of the above
Q:
A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact is
A) greater on the bug.
B) greater on the car.
C) the same for both.
Q:
Two people, one twice as massive as the other, attempt a tug-of-war with 12 meters of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of
A) 3 m.
B) 4 m.
C) 6 m.
D) 0 m.
Q:
A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the
A) Volkswagen.
B) Mack truck.
C) same for both.
Q:
An automobile and a golf cart traveling at the same speed collide head-on. The impact force is
A) greater on the automobile.
B) greater on the golf cart.
C) the same for both.
Q:
When a ball falls downward, it may have a net force
A) equal to its weight.
B) of zero.
C) equal to its weight minus air drag.
D) any of the above
E) none of the above
Q:
Neglecting air resistance, once a tossed ball leaves your hand
A) no further forces act on it.
B) only the force due to gravity acts on it.
C) inertia becomes the force acting on it.
D) your tossing force remains while the ball goes upward.
E) your tossing force remains until it comes to a stop.
Q:
The force exerted on the tires of a car that directly accelerate it along a road is exerted by the
A) engine.
B) tires.
C) air.
D) road.
E) none of the above