Physics 4th 6 Weeks Test Review

6 Weeks Test Review

By Stacy King

Momentum is the product of mass and velocity.

​Mass in motion

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​Momentum

Multiple Select

A car is parked in the school parking lot, identify what properties the car is exhibiting? (CHECK ALL that APPLY)

• inertia

• momentum

• velocity

• mass

Multiple Select

A car is parking in the schools west facing parking lot, identify what properties the car is exhibiting? (CHECK ALL that APPLY)

• inertia

• momentum

• velocity

• mass

In a closed system, energy is conserved.

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​Law of Conservation of Momentum

​Conservation of Momentum

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The system Total momentum = 0 ​

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object 1's momentum = - object 2's momentum

or

total initial momentum =

- total final momentum

Multiple Choice

The Law of Conservation of Momentum states:

• The total momentum before a collision is equal to the total momentum after a collision.

• The total momentum before a collision is greater than the total momentum after a collision.

• The total momentum before a collision is less than the total momentum after a collision.

• The total momentum before a collision is not related to the total momentum after a collision.

WRITE DOWN the given information

​ Remember

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​Calculating Impulse (J)

​J is the impulse

Multiple Choice

A rocket launches from a platform with a momentum of 6800 Kg m/s, why does the platform not move?

• inertia

• velocity

• mass in motion principle

• momentum principle

Multiple Choice

An object having a p_i of 30kg m/s has ended with a p_f of 40 kg m/s. What impulse caused this?

• 2kg m/s

• 10kg m/s

• 70kg m/s

• 5kg m/s

Multiple Choice

Pre- and post-collision information is shown. Identify the collision parameters that are consistent with the indicated change in momentum.

• change in momentum = 48 kg m/s

• change in momentum = 12 kg m/s

• change in momentum = 0 kg

• change in momentum = 3 kg m/s

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​If Impulse is the same what is changing?

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Time? ​ and Force? ​

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Force and Impulse

Multiple Choice

A boy kicks a football with a force of 20 N in 0.3 s.
Calculate the impulse on the ball.

• 1 N.s
• 6 N.s
• 66 N.s 
• None of these

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​The momentum before the collision equals the momentum after the collision.

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The energy before the collision equals the energy after the collision. But—the energy may be transformed.

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​Some text here about the topic of discussion.

​Collision Conservation

Perfectly inelastic collision: The objects stick together.

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Inelastic collision: These collisions are somewhat bouncy.

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Elastic collisions: These collisions are “perfectly” bouncy.

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Collision Types

Multiple Choice

Two objects stick together and move with a common velocity after colliding. Identify the type of collision.

• elastic

• perfectly elastic

• inelastic

• perfectly inelastic

​Collision Equation

Inelastic Collision Equation

Multiple Choice

The diagram shows a 2 kg box travelling at 3 m/s colliding with and sticking to a second box on a frictionless surface. The resultant velocity of the two boxes combined is 1 m/s. What is the mass of the second box, to the nearest kilogram?

• 4.0 kg

• 3.0 kg

• 0 m/s

• 1 m/s