Momentum, Impulse and Momentum Change

Object A: 5-kg object moving at 2 m/s Object B: 2-kg objrct moving 5 m/s Which one of the following statements describing the two objects is true?

Object A and Object B have the same amount of momentum

Object A: 2-kg object moving 4 m/s Object B: 4-kg object moving at 4 m/s Based on this description, Object A has what momentum compared to Object B.

One-fourth as much

A 4.0-kg object experience a force of 8.0 N for a time of 0.20 seconds. What is the momentum change experienced by the object?

1.6 kg×m/s

Two carts with masses of 0.5 kg and 2.0 kg are positioned next to one another on a low-friction track. A spring-loaded plunger is released, propelling the carts away from one another in an explosion. The cart on the left begins moving with a speed of 40 cm/s. With what speed will the cart on the right begin moving?

10 cm/s

A football player is running down the field. He has 240 kg×m/s of northward momentum. He experience a southward impulse of 80 N×s l. What is the final momentum - magnitude and direction - of the player?

160 kg×m/s, northward

A 2.0-kg is thrown towards a wall with a speed of 6.0 m/s. The ball hits the wall and rebounds backwards with a speed of 4.0 m/s. What is the magnitude of the impulse experienced by the ball?

20.0 N×s

A 50.0-kg object has an eastward momentum of 350 kg×m/s. The object encounters a westward impulse of 100 N×s. What is the magnitude of the final momentum of the object?

250 kg×m/s

A 2.0-kg object moving at 5.0 m/s experiences a 30-Newton resistive force over a duration of 0.10 seconds. What is the impulse experienced by the object?

3.0 N×s

Two carts with a mass of 0.5-kg are positioned next to one another on a low-friction track. A spring-loaded plunger is released, propelling the carts away from one another in an explosion. The cart on the left begins moving with a speed of 40 cm/s. With what speed will the cart on right begin moving?

40 cm/s

A 40.0-kg object has an eastward momentum of 360 kg×m/s. The object encounters a westward impulse of 120 N×s. What is the magnitude of the final velocity of the object?

6.0 m/s

An object that undergoes a collision will always experience an impulse. This impulse is

A force multiplied by a time that causes a change in momentum

Which one of the following objects has the greatest amount of momentum?

A pencil that is rolling across the desk towards the edge

An object that is speeding up would have

An increasing momentum

The value of the before- and after-collison is indicated by the arror. What is the total momentum of the system before the collison and after the collison?

Before the collison: ptotal = 45 kg×m/s

In a physic's demonstration, students are placed on separate carts. Cart A is 16 times more massive than Cart B. A student pushes on Cart A pushes upon Cart B. Which of the following statements describes the resulting motion of the two carts?

Cart A and Cart B will move away from each other with the same momentum.

In a physic's demonstration, two teams of equal-mass students are place on each of two identical carts. A student on Cart A pushes upon Cart B. Which of the following statements describes the resulting motion of the two carts?

Cart A and Cart B will move away from each other with the same speed.

Consider the mass and velocity values of Objects A and B below. Compare to Object B, Object A has what momentum.

Four times the

What a catching a baseball bare-handed, a person will draw their hand backwards in the direction of the ball's motion. The act of drawing the hand backwards is much safer than catching the ball with stiff arms. What affect does this have upon the collison of the ball and the hand?

It causes the time of the collison to be greater and the force to be less

Which one of the following is a unit of momentum?

Kg×m/s

An object that has momentum must be

Moving

The law of conservation of momentum applies to any collison between two objects that occurs in an isolated system. Assuming that the collison between Object A and Object B occurs in an isolated system, which of the following statements are consistent with this law?

The change in Object's A momentum will be equal and opposite to the change on Object B's momentum

An object experiences and impulse during a collision. What does the impulse equal?

The impulse is equal to the object's momentum change

What two quantities affect the of momentum an object possesses?

The mass of the object and the speed with which it is moving

Consider a collision between a more massive object and a less massive object. Which one of the following statements is correct?

The momentum change of the two objects is equal to magnitude

An object is moving to the left and speeding up. What is the direction of the momentum vector?

The momentum vector is directed leftward

Momentum is a vector quantity. What does being a vector indicate about momentum?

The quantity has both a magnitude and a direction associated with it

A small fish is at rest in the water. A big fish with four times the mass is gliding along with a speed of 20 cm/s. The big fish opens its mouth and captures the small fish. With what speed do the two fish glide through the water after the collison?

With a slower speed - perhaps 16 cm/s