Let's go through each of the questions in your quiz and solve them one by one, with explanations.
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1. A force that tries to stop a moving object is known as?
A) Electrical force
B) Gravitational force
C) Mechanical force
D) Force of friction
✔ Correct Answer: D) Force of friction
Explanation: Friction is a force that opposes motion between two surfaces in contact. It acts to slow down or stop a moving object. For example, when you slide a book on a table, friction between the book and the table eventually stops it.
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2. Ability to do work is known as?
A) Work
B) Machine
C) Energy
D) Force
✔ Correct Answer: C) Energy
Explanation: Energy is defined as the ability or capacity to do work. Work is the transfer of energy, so energy is what enables work to be done.
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3. The energy used to turn the blades of a windmill is called ________
A) Water energy
B) Solar energy
C) Wind energy
D) Muscular energy
✔ Correct Answer: C) Wind energy
Explanation: Windmills use the kinetic energy of moving air (wind) to turn their blades. This is called wind energy, which is a renewable source of energy.
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4. The energy obtained from the Sun is known as?
A) Wind energy
B) Solar energy
C) Electrical energy
D) Water energy
✔ Correct Answer: B) Solar energy
Explanation: "Solar" comes from the word "Sun." Solar energy is the energy derived from sunlight, often captured using solar panels.
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5. Identify whether work is done or not in the picture
*(Image shows a boy throwing a ball)*
A) Yes
B) No
✔ Correct Answer: A) Yes
Explanation: Work is done when a force causes an object to move in the direction of the force. In this case, the boy applies a force to the ball, and the ball moves — so work is done.
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6. Force can move a stationary object or stop a moving object.
A) True
B) False
✔ Correct Answer: A) True
Explanation: Force is responsible for changing the state of motion of an object. A force can:
- Start motion (move a stationary object)
- Stop motion (stop a moving object)
- Change direction or speed
This is based on Newton’s First Law of Motion.
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Summary of Answers:
| Question | Answer | Explanation |
|--------|--------|-----------|
| 1 | D | Friction opposes motion |
| 2 | C | Energy = ability to do work |
| 3 | C | Wind turns windmill blades |
| 4 | B | Sun → solar energy |
| 5 | A | Force applied, object moves → work is done |
| 6 | A | Force changes motion |
Let me know if you'd like help with the remaining questions (7–10), though they are cut off in the image!
Parent Tip: Review the logic above to help your child master the concept of energy worksheet for 4th grade.
