Third Law, Momentum, and Impulse Review

Newton's Third Law States...

• Objects in motion stay in motion and objects at rest stay at rest

• Force is equal to mass times acceleration

• For each action there is an equal and opposite reaction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

An archer shoots an arrow. The action force is the bowstring against the arrow, the reaction force is...

• Air resistance against the bow

• the arrow's push against the bowstring

• the grip of the archer's hand on the bow

Tags

NGSS.MS-PS2-1

A player throws a ball. The action force is the player impact on the ball. The reaction force is...

• The force of the ball impact on the player

• The force of the grip of the ball

• The celebration the player is thinking of

Tags

NGSS.MS-PS2-1

A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction force is...

• The grip of the player's hands on the ball

• the air resistance of the ball

• the force of the ball against the bat

Tags

NGSS.MS-PS2-1

A baseball player bats a ball with a force of 1,000 N. The ball exerts a reaction force (without any additional forces action on it) against the bat of...

• Less than 1, 000 N

• 1,000 N

• More than 1,000 N

Tags

NGSS.MS-PS2-1

Momentum is a measure of the ________ 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 equation to calculate momentum is

• p=mv

• p=1/2mv²

• p=mgh

• p=mg

To calculate the momentum of an object you must:

• divide mass by velocity

• multiply mass by velocity

• add the mass by velocity

• subtract the mass by velocity