Grade 4 Science Revision Worksheet focusing on energy forms and related terms.

It looks like you've uploaded a science worksheet from Greenwood International School for Grade 4, titled *"Science Revision Worksheet - Semester 1"*. The task is to choose the correct word from a given box to complete each sentence.

Given Words in the Box:

- in motion
- energy transfer
- energy
- heat energy
- sun
- chemical energy
- sound energy
- thermometer
- light
- collision

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Let’s go through each question and fill in the blanks with the most appropriate term from the list. I'll explain each answer clearly.

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A. ________ is the ability to cause change in matter.

✔ Answer: *Energy*

🔍 Explanation: Energy is defined as the ability to do work or cause change in matter. This is a fundamental definition in science.

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B. ________ is a natural source of energy.

✔ Answer: *Sun*

🔍 Explanation: The Sun is a natural source of energy, providing light and heat energy to Earth. It powers photosynthesis, weather systems, and solar energy technologies.

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C. Kinetic energy is the energy ________.

✔ Answer: *in motion*

🔍 Explanation: Kinetic energy is the energy an object has due to its motion. So, "in motion" completes the phrase correctly: "Kinetic energy is the energy in motion."

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D. Rubbing hands together produces ________.

✔ Answer: *heat energy*

🔍 Explanation: When you rub your hands together, friction occurs, converting mechanical energy into heat energy. You feel warmth — that's heat energy.

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E. Batteries store ________.

✔ Answer: *chemical energy*

🔍 Explanation: Batteries store energy in the form of chemical energy, which is released when the battery is used (e.g., in a flashlight or phone).

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F. The movement of energy from place to place or from object to object is called ________.

✔ Answer: *energy transfer*

🔍 Explanation: Energy transfer refers to how energy moves from one place or object to another, such as heat moving from a hot cup to your hand.

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G. We can see ________ energy.

✔ Answer: *light*

🔍 Explanation: Light energy is visible to our eyes. We can see it because it travels in waves and enters our eyes.

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H. The energy that results from vibrations that travel through air is ________.

✔ Answer: *sound energy*

🔍 Explanation: Sound is produced by vibrations that travel through air (or other media) as waves. These are known as sound energy.

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I. The instrument used to measure temperature is called ________.

✔ Answer: *thermometer*

🔍 Explanation: A thermometer is a device specifically designed to measure temperature. It uses materials like mercury or digital sensors to show how hot or cold something is.

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J. When two objects bump into each other it is called ________.

✔ Answer: *collision*

🔍 Explanation: A collision happens when two objects come into contact and interact physically. For example, a ball hitting a wall or two cars crashing.

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✔ Final Answers:

| Question | Answer |
|--------|--------|
| A | energy |
| B | sun |
| C | in motion |
| D | heat energy |
| E | chemical energy |
| F | energy transfer |
| G | light |
| H | sound energy |
| I | thermometer |
| J | collision |

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Let me know if you'd like this formatted as a printable answer key or need help explaining any concept further!