Designing a Device to Minimize Net Force During Collisions

Collisions where no energy is lost are

• epileptic

• elastic

• erectic

• erratic

The energy of the moving ball ​ (a)   to the still ball when they ​ (b)   . With the energy it ​ (c)   during the collision, the ball that was still now is set in ​ (d)   . The ball that was moving now is ​ (e)   .

• transfers

• collide

• gains

• motion

• still

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NGSS.MS-PS2-1

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NGSS.MS-PS3-5

Identify the collision sport

• Hockey

• Soccer

• Badminton

• Squash

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1.1

Imagine that a truck rolling down a hill hits a stationary car at the bottom. Which of the following is most likely to happen?

• When the truck and car collide, they will move in opposite directions.

• When the truck and car collide, the car is pushed and begins moving and the truck slowly comes to a stop.

• When the truck and car collide, the truck rolls over the car and keeps moving.

• When the truck and car collide, the car does not move and the truck comes to a stop.

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NGSS.MS-PS2-1

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In which direction will the ball most likely go after it hits the wall?

• 
• 
• 
• 

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NGSS.MS-PS2-1

In a two-body collision,

• momentum is always conserved

• kinetic energy is always conserved

• neither momentum nor kinetic energy is conserved

• both momentum and kinetic energy are always conserved

More collisions correspond to a: 

• Faster reaction rate  

• Slower reaction rate

• Constant reaction rate 

• None of the above

A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

• For every action there is an equal and opposite reaction.

• Every mass exerts a force on every other mass.

• An object at rest tends to stay at rest.

• Friction opposes the motion of an object.

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NGSS.MS-PS2-1

A 12.0 kg green toy car cruises left at 4 m/s and hits a 6.0 kg blue toy car moving the opposite direction at 2 m/s. The blue car bounces at 1 m/s. What was the velocity of the green car?

• -4.5 m/s

• -3.5 m/s

• -2.5 m/s

• -12 m/s

Collisions may take place between: 

• atoms

• ions

• molecules

• all of the above