Multiple choice test for Chapter 17, featuring questions and answer choices.

Let's go through each question in the Chapter 07 Multiple Choice Test and solve them step by step with explanations.

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1. If you go twice as fast, your kinetic energy becomes:

Answer: d. 4 times bigger

Explanation:
Kinetic energy (KE) is given by the formula:

$$
KE = \frac{1}{2}mv^2
$$

If speed $ v $ doubles (i.e., becomes $ 2v $), then:

$$
KE_{\text{new}} = \frac{1}{2}m(2v)^2 = \frac{1}{2}m(4v^2) = 4 \times \left(\frac{1}{2}mv^2\right)
$$

So, kinetic energy becomes 4 times bigger.

✔ Correct answer: d

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2. Energy is measured in:

Answer: b. joules

Explanation:
The standard unit of energy in the International System (SI) is the joule (J).
- Newtons (N) are units of force.
- kg/m² is not a standard energy unit.
- kg·m/s² is the unit of force (newton).

✔ Correct answer: b

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3. What is a requirement of doing work?

Answer: b. Energy

Explanation:
Work is defined as force applied over a distance, and it requires energy to be transferred or used. Without energy, no work can be done.
While force and displacement are needed for work (W = F × d), the underlying requirement is energy — work is the transfer of energy.

✔ Correct answer: b

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4. An extended spring stores:

Answer: b. potential energy

Explanation:
When a spring is stretched or compressed, it stores elastic potential energy due to its deformation. This is a form of potential energy.

✔ Correct answer: b

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5. Energy can be thought of as stored _____

Answer: d. Work

Explanation:
Energy is the capacity to do work. So, energy can be thought of as stored work — it’s the ability to perform work.
For example, a battery stores chemical energy that can be converted into electrical work.

✔ Correct answer: d

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6. Kinetic energy increases with:

Answer: b. mass and speed

Explanation:
From the formula:
$$
KE = \frac{1}{2}mv^2
$$
Kinetic energy depends on both mass and speed. It increases with:
- More mass → more KE
- Higher speed → even more KE (since speed is squared)

It does not directly depend on distance or time.

✔ Correct answer: b

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7. Potential energy is energy due to the:

Answer: b. height of an object

Explanation:
Gravitational potential energy is due to an object's height above a reference point:
$$
PE = mgh
$$
Other forms of potential energy include elastic (e.g., stretched spring) or chemical, but here, the most direct answer among choices is height.

Note: While "a stretched rubber band" also has potential energy, this choice isn't listed here. Among the options, height is the correct reason for gravitational potential energy.

✔ Correct answer: b

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8. Which of the following stores energy?

Answer: d. All of the above

Explanation:
- A battery stores chemical energy
- Food stores chemical energy
- A stretched rubber band stores elastic potential energy

All three store energy in different forms.

✔ Correct answer: d

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✔ Final Answers:

| Question | Answer |
|--------|--------|
| 1 | d |
| 2 | b |
| 3 | b |
| 4 | b |
| 5 | d |
| 6 | b |
| 7 | b |
| 8 | d |

Let me know if you'd like this formatted as a completed test sheet!