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Section 1

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Two blocks of ice, one four times as heavy as the other, are at rest on a frozen lake. A person pushes each block the same distance d. Ignore friction and assume that an equal force F⃗ is exerted on each block. Now assume that both blocks have the same speed after being pushed with the same force F⃗ . What can be said about the distances the two blocks are pushed?

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5 years ago

Date created

Mar 1, 2020

Cards (20)

Section 1

(20 cards)

Two blocks of ice, one four times as heavy as the other, are at rest on a frozen lake. A person pushes each block the same distance d. Ignore friction and assume that an equal force F⃗ is exerted on each block. Now assume that both blocks have the same speed after being pushed with the same force F⃗ . What can be said about the distances the two blocks are pushed?

Front

The heavy block must be pushed 4 times farther than the light block.

Back

You have two identical balls and you throw them directly upward. What happens when the speed of one of them is doubled?

Front

the ball whose's speed was doubled will go four times as high

Back

For an elastic collision, which of the following statements are true?

Front

Momentum is conserved. , Kinetic energy is conserved.

Back

If a spring is compressed a distance of 2x, what happens to the speed?

Front

the box will travel twice as fast

Back

A baseball is thrown vertically upward and feels no air resistance. As it is rising,

Front

it's momentum is not conserved, but it's mechanical energy is conserved.

Back

For an INELASTIC collision, which of the following statements are true?

Front

Momentum is conserved. , Kinetic energy is lost.

Back

During a collision, how does the magnitude of the impulse imparted to a lighter object by a heavier object compare to the impulse imparted by a lighter object to a heavier object?

Front

They both feel the same impulse.

Back

When a person steps forward out of a small boat onto a dock, the boat recoils backward in the water. Why does this occur?

Front

The total momentum of the system is conserved.

Back

Now consider two springs A and B that are attached to a wall. Spring A has a spring constant that is four times that of the spring constant of spring B. If the same amount of energy is required to stretch both springs, what can be said about the distance each spring is stretched?

Front

Spring A must stretch half the distance spring B stretches.

Back

Two blocks of ice, one four times as heavy as the other, are at rest on a frozen lake. A person pushes each block the same distance d. Ignore friction and assume that an equal force F⃗ is exerted on each block. Compared to the speed of the heavier block, what is the speed of the light block after both blocks move the same distance.

Front

twice as fast

Back

A lump of putty and a rubber ball have equal mass. Both are thrown with equal speed against a wall. The putty sticks to the wall. The ball bounces back at nearly the same speed with which it hit the wall. Which object experiences the greater momentum change?

Front

The ball experiences the greater momentum change.

Back

Two identical springs are attached to two different masses, MA and MB, where MA is greater than MB. The masses lie on a frictionless surface. Both springs are compressed the same distance, d, as shown in the figure. Which of the following statements descibes the energy required to compress spring A and spring B?

Front

Spring A requires the same amount of energy as spring B.

Back

A box of mass m is pressed against (but is not attached to) an ideal spring of force constant k and negligible mass, compressing the spring a distance x. After it is released, the box slides up a frictionless incline as shown in the figure and eventually stops. If we repeat this experiment with a box of mass 2m, what will happen to the height of the lighter box?

Front

the lighter box will go twice as high up the incline as the heavier box.

Back

A lump of putty and a rubber ball have equal mass. Both are thrown with equal speed against a wall. The putty sticks to the wall. The ball bounces back at nearly the same speed with which it hit the wall. Which object experiences the greater momentum change?

Front

The ball

Back

If the net work done on an object is zero, what can you determine about the object's kinetic energy?

Front

KE remains the same.

Back

Person B does twice the work of person A, and in one-half of the time . How does the power output of person B compare to person A?

Front

Person B has four times the power output of person A.

Back

In a lab environment, you are investigating the impulse of a force exerted on a brick when the brick's speed is reduced from 2.5 m/s to a complete stop. First, you allow the brick to slam into a secured piece of wood, bringing the brick to a sudden stop. Second, you allow the brick to plow into a large slab of gelatin so that the brick comes to a gradual halt. In which situation is there a greater impulse of the force on the brick?

Front

Impulse is the same.

Back

Two objects are moving at equal speed along a level, frictionless surface. The second object has twice the mass of the first object. They both slide up the same frictionless incline plane. Which object rises to a greater height?

Front

The two objects rise to the same height

Back

A person applies a 50 N force on a crate, causing it to move horizontally at a constant speed through a distance of 10 m. What is the net work done on the crate?

Front

0. CONSTANT SPEED.

Back

Two blocks of ice, one four times as heavy as the other, are at rest on a frozen lake. A person pushes each block the same distance d. Ignore friction and assume that an equal force F⃗ is exerted on each block. Which of the following statements is true about the kinetic energy of the heavier block after the push?

Front

It is equal to the kinetic energy of the lighter block. Work-Energy Theorem

Back