Momentum Quiz Review

Momentum is a measure of the (a)   of an object.

Tags

NGSS.HS-PS2-2

What is the momentum of a 5 kg object that has a velocity of 1.2 m/s?

• 3.8 kg • m/s

• 4.2 kg • m/s

• 6.0 kg • m/s

• 6.2 kg • m/s

Answer explanation

$p\ =\ m\cdot v$ $\rightarrow p=5\cdot1.2$

Tags

NGSS.HS-PS2-2

A car has a momentum of 20,000 kg • m/s. What would the car’s momentum be if its velocity doubles?

• 10,000 kg • m/s

• 20,000 kg • m/s

• 40,000 kg • m/s

• 80,000 kg • m/s

Answer explanation

Think about the momentum formula ( $p=m\cdot v$ )

Tags

NGSS.HS-PS2-2

The law of conservation of momentum states that, if left alone, what happens to the total momentum of two interacting objects that make up a system?

• it increases over time

• it remains the same

• it eventually becomes zero

• changes based on how they collide

Answer explanation

Law of conservation states that the initial momentum will be the same as a final momentum.

Tags

NGSS.HS-PS2-2

Objects 1 and 2 collide and stick together. Which best describes the momentum of the resulting single object?

• It is less than the momentum of object 1 but greater than the momentum of object 2.

• It is greater than the momentum of object 1 but less than the momentum of object 2.

• It is equal to the momentum of object 1 minus the momentum of object 2.

• It is equal to the momentum of object 1 plus the momentum of object 2.

Answer explanation

Law of momentum states that initial momentum EQUALS final momentum.

Tags

NGSS.HS-PS2-2

Which formula can be used to express the law of conservation of momentum, where p = momentum?

• pi = pf

• pi > pf

• pi < pf

• pi ≠ pf

Answer explanation

Law of conservation is initial momentum = final momentum

Tags

NGSS.HS-PS2-2

Two carts collide and bounce apart. Cart 1 had a momentum of –6 kg • m/s before the collision. Cart 2 had a momentum of 10 kg • m/s before the collision. What is the total momentum of the carts after the collision?

• –16 kg • m/s

• –10 kg • m/s

• 4 kg • m/s

• 10 kg • m/s

Answer explanation

$-6+10\ =\$

Initial momentum = final momentum

Tags

NGSS.HS-PS2-2

According to Newton’s third law of motion, which are equal?

• momentum and velocity

• collision time and stop time

• mass and momentum

• action force and reaction force

Answer explanation

When there is an action force there is an EQUAL reaction force.

Tags

NGSS.MS-PS2-1

When someone throws a ball, the action force is the person pushing on the ball. What is the reaction force?

• the ball pushing on the person

• the ball pushing against air

• the ball being pulled toward the ground

• the ball being pulled away from the person

Answer explanation

Think of Newton's Third Law of Motion.

Tags

NGSS.HS-PS2-1

Denise is riding her bike and falls to the ground. During the collision, she hits both grass and cement. Which best explains why Denise had fewer injuries to the area of her body that hit the grass?

• The grass did not exert a reaction force

• The grass did not exert an action force.

• The grass shortens the time of the collision.

• The grass extends the time of the collision.