HP Unit 06 Review

HP Unit 06 Review

6-1: Momentum and Impulse

• Momentum is the product of an object's mass and velocity.

• More mass or a greater velocity means Higher Momentum.

• An impulse is any change in momentum.

• More force or less time means Greater Impulse.

Multiple Choice

If a net force is acting on an object,

• its velocity must be constant

• its velocity must be changing

• its mass must be changing

• its acceleration = 0

Multiple Choice

Which of the following has the greatest momentum?

• a scurrying cockroach

• a parked semi-truck

• more information is needed

Multiple Choice

Which of the following has more momentum? 

• a moving SUV
• a moving semi-truck
• more information is needed

Multiple Choice

Which takes more force to catch, a bowling ball or a ping pong ball?

• bowling ball because it has more momentum

• ping pong ball because it has more momentum

• both require the same amount of force when catching

Multiple Choice

Most modern vehicles have padded dashboards. This reduces collision injuries by...

• increasing the time of impact

• increasing the driver's change in momentum

• increasing the force of impact

Multiple Choice

The impulse-momentum theorem states that

• the impulse on an object is equal to the change in momentum it causes 
• the force on a moving object is equal to the magnitude of the impulse.
• the impulse on an object is greater than the change in momentum it causes 
• the impulse on an object is less than the change in momentum it causes

6-2: Elastic Collisions

• Elastic collisions involve objects that hit each other and bounce away from one another.

• BOTH momentum and kinetic energy are conserved. The Total Amount stays constant!

• No collision is perfectly elastic.

6-2: Inelastic Collisions

• Inelastic collisions involve objects that hit each other and stick together.

• Momentum and Kinetic Energy are NOT conserved, as some energy is transferred into thermal and sound energy.

• No collision is perfectly inelastic.

Multiple Choice

What makes things happen?

• matter

• velocity

• energy

• mass

Multiple Choice

The picture shows what type of collision?

• Inelastic Collision

• Elastic Collision

Multiple Choice

Jorge noticed a collision outside the coffee shop where two cars crashed and stuck together. What type of collision did he observe?

• Elastic

• Inelastic

Multiple Choice

No collision is either perfectly elastic or perfectly inelastic.

• True

• False

Multiple Choice

Which of the following is true about what happens to energy when two cars collide?

• The total amount of energy between the two cars becomes zero.

• The total amount of energy between the two cars stays the same.

• The total amount of energy between the two cars increases.

• The total amount of energy between the two cars decreases.

6-3: Kinetic Energy

• The energy of motion!

• Greater Velocity = More KE

• Higher Mass = More KE

• A change is Kinetic Energy is defined as Work.

6-3: Potential Energy

• Stored Energy!

• Gravitational: Position

• Elastic: Stretchiness

• Chemical: Bonds

Multiple Choice

As mass increases, KE ...

• increases

• decreases

• stays the same

Multiple Choice

As the velocity of an object decreases its KE will...

• increase
• decrease
• stay the same

Multiple Choice

Steve, Mary, Annie, and James hit four identical tennis balls with a racket. The diagram below shows the top speed at which each tennis ball moved when it was hit.

Based on the diagram, which of the following is true about the tennis balls when they were at their top speed?

• James's ball had the most kinetic energy.

• Steve's ball had the most kinetic energy.

• Mary's ball had the most kinetic energy.

• Annie's ball had the most kinetic energy.

Multiple Choice

At which point does the ball has the greatest gravitational potential energy (GPE)?

• A

• G

• D

• C

• G

Multiple Choice

Which of the following is an example of chemical energy being changed into kinetic energy?

• Digested food giving you energy to jump.

• An apple falling from a tree.

• A hand hitting a drum making music.

• Two liquids mixed together and get hot.