Unit 4 Final Exam

force=

(This is the original version of Newton's 2nd Law!)

• change in momentum

• change in momentum per unit time

• change in velocity

• change in velocity per unit time

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NGSS.HS-PS2-1

A bowling ball and a ping-pong ball are rolling towards you with the same momentum, and you stop them with the same force before they hit you. How do their stop times compare?

• The bowling ball stops first

• The ping-pong ball stops first

• They stop in the same amount of time

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NGSS.HS-PS2-2

What is the direction of the ball's impulse (change in momentum)?

• straight down

• straight up

• to the right

• to the left

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NGSS.HS-PS2-1

NGSS.HS-PS2-2

All of these collisions are completely inelastic. Which will cause the most damage (dissipate the most energy)?

• I

• II

• III

• All are the same

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NGSS.HS-PS2-1

NGSS.HS-PS2-2

In a perfectly elastic collision, which is conserved?

• energy

• momentum

• energy and momentum

• neither

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NGSS.HS-PS2-2

In a perfectly inelastic collision, which is conserved?

• energy

• momentum

• energy and momentum

• neither

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NGSS.HS-PS2-2

In a ballistic pendulum, a spring pushes a ball from rest. After the ball leaves the spring, it flies through the air and lodges inside the pendulum amd they move together.

What best explains the second process?

• Conservation of energy

• Conservation of momentum

• Newton's first law

• Newton's third law

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NGSS.HS-PS2-2

In a ballistic pendulum, a spring pushes a ball from rest. It flies through the air and sticks in the base of a pendlum that swings upwards. The ball and pendulum move together and reach some maximum height and maximum angle.

To find the maximum angle to which the pendulum swings, the best concept to use is

• Conservation of energy

• Conservation of momentum

• Newton's first law

• Newton's third law

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NGSS.HS-PS2-2

NGSS.HS-PS3-1

The cart is initially at rest on a frictionless surface. The person on the cart is throwing balls at this wall and they bounce straight back. What does the cart do?

• Moves to the left

• Moves to the right

• Stays still

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NGSS.HS-PS2-1

NGSS.HS-PS2-2