Speed and Energy

Two model trains are running on tracks that are lined up next to each other. The two trains are not moving at the same speed. What would cause one train to move faster than the other?

• The slower train's cars have less mass

• The faster train has a wider track

• The faster train has more energy

• The slower train has an older engine

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We observe a moving object. When we observe the object moving more slowly, we know that it

• will move in a new direction

• has more gravity pulling on it

• can't go back to where it started

• had less energy than it did before

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A student has some short and tall ramps and a toy car and decides to use them to create an investigation. After her investigation, she discovers some ramps gave more energy to the car. Which ramps gave the car more energy?

• the taller ramp

• the shorter ramp

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The transfer of energy from one object to another or one form to another

• energy

• movement

• energy transfer

• motion

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Which will have more energy?

• a swing being pushed by a small child

• a swing being pushed by an adult

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A moving object will have more energy when the object–

• moves faster

• changes direction

• loses mass

• stops moving

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

A student has some short and tall ramps and a toy car. She decides to use them to create an investigation. She wants to know which ramp will give the car the most energy. What evidence should she look for? Explain.

• She should see which care moves the fastest down a ramp. The type of car makes a difference.

• She should use one ramp and test many cars. Car design is most important.

• She should see which ramp makes the car moves the fastest. The faster the car the more energy it has.

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That which is needed to do work

• Decrease

• Increase

• Speed

• Energy

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Rate of motion

• Energy

• Speed

• Increase

• Decrease

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NGSS.MS-PS3-1

Four identical balls are rolled from the same position at the same time. The illustration shows each ball’s starting position and ending position after rolling for two seconds. Which ball had the most energy?

• Ball 1

• Ball 2

• Ball 3

• Ball 4

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