Relationship Between Speed and Energy

Car 1 and Car 2 have the same mass. Which of the following statements is true?

• Car 1 has the most kinetic energy because it is moving at a faster rate of speed.

• Car 2 has the least amount of kinetic energy because it is actually smaller than car one.

• Car 2 has the most kinetic energy because it is moving at a slower rate of speed.

• Car 1 has the least amount of kinetic energy because it is moving at a faster rate of speed.

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This is the equation for kinetic energy. Based on the equation, we know that the relationship between kinetic energy (KE) and speed or velcity (v) is _______________.

• linear

• non-linear

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• 
• 

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Kinetic energy is...

• energy carried in ultraviolet waves

• energy stored in food

• energy in motion

• energy from splitting an atom

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Frank throws the same ball three different times. The diagram below shows the top speed at which the ball traveled during each throw.

• The ball had the most kinetic energy during the first throw.

• The ball had the most kinetic energy during the third throw.

• The ball had the most kinetic energy during the second throw.

• The ball had the same kinetic energy during all three throws.

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Which example best illustrates kinetic energy?

• A light bulb that is turned on.

• A car that is parked on top of a hill.

• A comet that is flying through space.

• A battery that is connected to a circuit.

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A roller coaster car moves on a roller coaster track through positions w, x, y, and z. At what position will the roller coaster car most likely have the greatest kinetic energy?

• W

• X

• Y

• Z

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How can he describe the relationship between the temperature of the water and the energy of the water molecules in the system?

• The lower the temperature of the water, the greater the amount of energy in the system and the faster the water molecules move.

• The higher the temperature of the water, the greater amount of energy in the system and the faster the water molecules move.

• The higher the temperature of the water, the lower amount of energy in the system and the slower the water molecules move.

• The temperature of the water has no effect on the speed of the molecules, so the amount of energy in the system does not change.

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NASA is testing identical miniature rockets using the same platform. The data collected from one launch are shown in the graph. Which of these describes the relationship between the rocket’s speed and its kinetic energy?

• A. There is a linear relationship between speed and kinetic energy.

• B. There is a constant relationship between speed and kinetic energy.

• C. There is a nonlinear relationship between speed and kinetic energy.

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NGSS.MS-PS3-1

What happens to the kinetic energy of an object if its speed is doubled?

• It remains the same

• It doubles

• It quadruples

• It halves

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