# Physics Revision Work Energy Power SEC 3/4/5

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Mrguienghong
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Quizzes Created: 2 | Total Attempts: 3,251
Questions: 6 | Attempts: 178

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• 1.

### A 2N force pushes a box. The box moves 3.0m. How much work is done?

• A.

6J

• B.

1.5J

• C.

6W

• D.

1.5W

A. 6J
Explanation
work = force x distance

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• 2.

### A 4 kg ball moves with 3m/s. what is its kinetic energy?

• A.

12J

• B.

36J

• C.

18J

• D.

9J

C. 18J
Explanation
kinetic energy = 1/2 x mass x speed x speed

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• 3.

### A tennis ball 200g is 2.0m above the ground. G=10N/kg. How much gravitational potential energy does the ball have?

• A.

4000J

• B.

40J

• C.

100J

• D.

4J

D. 4J
Explanation
mgH ; mass must be in Kg! 0.2kg x 10N/kg x 2 m = 4J

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• 4.

### A electric dry cell (battery) is used to power a lamp. what energy conversion takes place?

• A.

Chemical --> electrical energy

• B.

Chemical --> light energy only

• C.

Chemical --> electrical energy --: heat and light energy

• D.

Chemical --> electrical energy --: heat energy only

C. Chemical --> electrical energy --: heat and light energy
Explanation
The correct answer is "chemical --> electrical energy --: heat and light energy". When an electric dry cell (battery) is used to power a lamp, the chemical energy stored in the battery is converted into electrical energy. This electrical energy is then converted into both heat and light energy, which are the forms of energy that the lamp emits.

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• 5.

### Princple of conservation of energy states that energy cannot be created nor destroyed. Energy is transform from one __________ into another.

form
type
kind
Explanation
The principle of conservation of energy states that energy cannot be created nor destroyed. Instead, it can only be transformed from one form, type, or kind into another. This means that energy can change its manifestation or characteristics, but the total amount of energy in a closed system remains constant.

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• 6.

### When a ball is thrown up vertically, its ____________energy decreases, while its gravitational potential energy increases

kinetic
Explanation
When a ball is thrown up vertically, its kinetic energy decreases because it is moving against the force of gravity and slowing down. At the same time, its gravitational potential energy increases because it is moving higher against the force of gravity.

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• Current Version
• Mar 20, 2023
Quiz Edited by
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• Jul 20, 2010
Quiz Created by
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