Measuring Kinetic Energy - TCI Forces and Energy Lesson 8

Kinetic energy is measured in

• Newtons (N)

• Joules (J)

• Kilograms (kg)

• miles per hour (mph)

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What two factors affect an object's kinetic energy?

• area and volume

• mass and weight

• weight and height

• mass and speed

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As mass increases, KE ...

• increases
• decreases
• stays the same

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

• increase
• decrease
• stay the same

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NGSS.MS-PS3-1

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Why is it harder to stop a four-person bobsled than a three-person bobsled?

• the four-person sled has more KE
• the four-person sled has less KE

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The mathematical formula to find the amount of kinetic energy is....

• $\left(mass\ x\ speed^2\right)\ \div\ 2$

• $mass\ x\ speed\ \div\ 2$

• $2\ x\ mass\ x\ speed^2$

• $2\ x\ mass\ x\ speed$

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NGSS.MS-PS3-1

A cheetah can run briefly with a speed of 31.0 m/s. Suppose a cheetah with a mass of 47.0 kg runs at this speed. What is the cheetah’s kinetic energy?

• 1457 Joules

• 22,584 Joules

• 15 Joules

• 45,167Joules

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Calculate the kinetic energy of a moving 4 kg object travelling at a velocity of 3 m/s.

• 18 J
• 36 J
• 12 J
• 6 J

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NGSS.MS-PS3-1

A 60 kg Ewok is travelling at a constant speed of 7 m/s. What is its kinetic energy in KJ?

• 1.47 KJ
• 210 KJ
• 147 KJ
• 1470 KJ

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Mass and kinetic energy have a

• proportional relationship

• linear relationship

• both

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