Physics Revision Work Energy Power SEC 3/4/5
Questions and Answers
- 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
Correct Answer
A. 6JExplanation
work = force x distanceRate this question:
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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
Correct Answer
C. 18JExplanation
kinetic energy = 1/2 x mass x speed x speedRate this question:
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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
Correct Answer
D. 4JExplanation
mgH ; mass must be in Kg! 0.2kg x 10N/kg x 2 m = 4JRate this question:
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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
Correct Answer
C. Chemical --> electrical energy --: heat and light energyExplanation
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.Rate this question:
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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.
Correct Answer
form
type
kindExplanation
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.Rate this question:
- 6.
When a ball is thrown up vertically, its ____________energy decreases, while its gravitational potential energy increases
Correct Answer
kineticExplanation
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.Rate this question:
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Mar 20, 2023Quiz Edited by
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Jul 20, 2010Quiz Created by
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