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JCE (Botswana) Potential and Kinetic Energy — practice questions

Explore 4 free Potential and Kinetic Energy questions in JCE (Botswana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Potential and Kinetic Energy questions and exercises with answers

Showing questions 1–4 of 4.

Which one of these has kinetic energy?Read the answer and worked solution →A marble is released from higher up a ramp. Why does it push the cup further?Read the answer and worked solution →What does the law of conservation of energy state about energy in a system?Read the answer and worked solution →A ball is thrown straight upwards. At the very top of its path, what is true of its energy?Read the answer and worked solution →

Worked practice questions

Which one of these has kinetic energy?

  1. A stone on a wall
  2. A bird in flight
  3. A book on a shelf
  4. A parked bicycle
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Correct answer: B. A bird in flight

1. Kinetic energy is the energy an object has because it is moving. 2. A bird in flight is moving, so it has kinetic energy. 3. A stone on a wall, a book on a shelf and a parked bicycle are all still. 4. Those three have stored energy but no kinetic energy. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Kinetic energy_

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A marble is released from higher up a ramp. Why does it push the cup further?

  1. It starts with less stored energy
  2. It has a much greater mass
  3. It has a much smaller size
  4. It starts with more stored energy
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Correct answer: D. It starts with more stored energy

1. Energy is not created by the ramp, it is only stored and then released. 2. A marble held higher up the ramp starts with more stored energy. 3. Rolling down turns that stored energy into movement energy. 4. The marble therefore reaches the bottom moving faster than before. 5. More movement energy is passed on to the cup when the two collide. 6. So the cup is pushed further across the table. 7. The same marble is used every time, so its mass and its size never change. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), How can we make the foam cup move further?_

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What does the law of conservation of energy state about energy in a system?

  1. Energy can only be transferred
  2. Energy can only be destroyed
  3. Energy can only be created
  4. Energy can only be weighed
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Correct answer: A. Energy can only be transferred

1. Energy is never made from nothing and never disappears. 2. It only moves from one part of a system to another. 3. It can also change form, for example from stored energy to movement energy. 4. That is why the total energy of a system stays the same. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Law of conservation of energy_

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More Science topics

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