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Physics Exam 2 Multiple Choice
Terms in this set (50)
If you push for an hour against a stationary wall, you do no work
On the wall.
A given net force propels an object along a straight line path. If the net force were doubled, its acceleration would
When a simple machine multiplies force, it decreases
A heavy ball hangs by a string, with a second string attached to its bottom. A quick pull in the bottom string breaks the
To catch a fast moving softball with your bare hand, you extend your hand forward just before the catch and then let the ball ride backward with your hand. Doing this reduces the catching force because the
Time of catch is increased.
Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the rock tends at first to
Follow a straight line path.
Compared with a 1 kg block of solid iron, a 2 kg block of solid iron has twice as much
Mass, volume, and inertia.
When Peter tosses an egg against a sagging sheet, the egg doesn't break due to
Neither reduced momentum and reduced impulse.
When the bottom string is pulled slowly in the heavy ball and strings demonstrate, tension
In the top string is due to your pull plus the weight of the ball.
In raising a 5000 N piano with a pulley system, for every 1 m of rope pulled down, the piano rises 0.1 m. Ideally, this means the force needed to lift the piano is
A skydiver, who weighs 500 N, reaches terminal velocity at 90 km/h. The air resistance on the skydiver is
A car moves 4 times as fast as another identical car. Compared to the slower car, the faster car has
16 times the kinetic energy.
A Mack truck and a Mini Cooper traveling at the same speed collide head on. The collision force is created on the
Same on both.
If a charging rhinoceros has momentum, it must also have
An 800-N man stands at rest with his weight evenly distributed on two bathroom scales. The reading on each scale is
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is
Greater with the brick wall.
A chunk of metal has a mass of 1 kg on Earth. If the same chunk were on the Moon its mass would be
When Jean standing on slippery ice catches her leaping dog Daisy, the momentum of both Jean and Daisy after the catch is
Equal to their combined momentum before the catch.
An object is pulled with three forces: one at 20 N to the right, another at 40 N to the right, and the third at 30 N to the left. The net force is
None of the choices.
If you do work on an object in half the time, your power output is
While driving down the highway a bug spatters onto your windshield. Which experiences the greater force of impact?
Both the same but with different consequences.
While driving down the highway a bug spatters onto your windshield. Which undergoes the greater change in momentum during the time of contact?
Both the same.
A pulley system can
Multiply a force and change the direction of a force.
The gain in speed each second for a freely falling object is about
A heavy truck and a small truck roll down a hill. Neglecting friction, at the bottom of the hill the heavy truck has greater
When a boxer is moving away from a punch, the force experienced is reduced because
The time of contact is increased.
A given net force propels an object along a straight line path. If the mass were doubled, it's acceleration would
Stay the same.
Arnold Strongman and Suzie Small each pull very on opposite ends of a rope in a tug-of-war. The greater force on the rope is exerted by
Same by each.
A circus diver drops from a high pole into water far below. When he is halfway down
He has gained an amount of kinetic energy equal to half his initial potential energy, his kinetic and potential energies are equal and his potential energy is halved.
A girl pushes a cart to the left with 100 N force. At the same time a boy pushes it to the right with a 50 N force. The net force exerted on the cart is
50 N to the left.
When you push a crate across a level floor at constant velocity, friction between the crate and the floor is
The same amount as your pushing force.
A heavy rock and a light rock in free fall have the same acceleration because the
Ratio of force to mass is the same.
Compared with falling on a wooden floor, a wine glass may not break when it falls on carpeted floor because of
Longer time to stop.
A 10 kg brick and a 1 kg book are dropped in a vacuum. The acceleration of the 10 kg brick is
The same as that of the 1 kg book.
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, it's momentum is
A skydiver jumps from a high flying plane. As her velocity of fall increases, her acceleration
A motor scooter undergoes acceleration when it
All of the choices
The equilibrium rule states that the vector sum of all forces acting on a
All 3 choices.
A shopping cart moves with a kinetic energy of 40 J. If it moves at twice the speed, its kinetic energy is
An object may have potential energy because of its
A free falling object has a speed of 30 m/s at one instant. Exactly 2 seconds later it's speed will be
A karate expert executed a swift blow and breaks a cement block with her bare hand. The magnitude of the force on her hand is
The same as the force applies to the block.
When dishes remain on a table when you yank the tablecloth beneath them, you're demonstrating
If an object falls with constant acceleration, the velocity of the object must
Continually change by the same amount each second.
A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration is
When an object falls through the air, as velocity increases the net force
When a cannon fires a cannonball at a given speed, the smaller recoil speed of the cannon is due to differences in
A hockey puck slides across a frozen pond. If ice friction and air resistance are neglected, the force needed to keep the puck sliding at constant velocity is
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
Both the same.
A kilogram is a measure of an object's
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