Vash Education: Motion

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Kinetic Energy and Gravitational Potential Energy

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1. What formula is used to find kinetic energy?

1 point

Kinetic energy = mass x velocity2

Kinetic energy = 0.5 x mass x velocity

Kinetic energy = 0.5 x mass x velocity2

Kinetic energy = mass x velocity

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2. A dog has a mass of 20kg and is running at 15 m/s.

Calculate the kinetic energy of the dog.

1 point

3. The same dog then accelerates at 2.5 m/s2 within 4s. Its starting velocity is 15m/s.

Find out its kinetic energy, in joules, after it finishes accelerating.

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4. A person with mass 60kg walks along a street while transferring a kinetic energy of 58.8J.

Calculate their velocity in m/s.

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5. What is the acceleration due to gravity on Earth, to 2 decimal places?

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8.74 m/s2

10.34 m/s2

7.91 m/s2

9.81 m/s2

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6. Find the gravitational potential energy of a girl at the top of a 2m slide who has a mass of 40kg in Joules.

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7. A roman catapult uses a larger rock pushed from higher ground to launch a smaller mass into the air. The large rock has a mass of 150kg and is pushed off from a height of 4m. What is the greatest mass it could launch over a 10m high wall in Kilograms?

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8. A ball is thrown off a building.

At the top of the building, it had a gravitational potential energy of 40J. The mass of the ball is 0.5kg.

Find the height of the building in meters. Use acceleration due to gravity=10m/s.

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9. A ball is dropped from a height of 2m with a mass of 0.5kg.

What is the kinetic energy, in joules, of the ball just before it hits the ground?

(Assume energy transfer is 100% efficient)

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10. A boy who has a mass of 45kg jumps to a height with a velocity of 2m/s.

Find the maximum height, in centimetres, he could have jumped, assuming energy transfer is 100% efficient.

(Use acceleration due to gravity = 10m/s2)

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