# 2,3 / 2,4 Reading Quiz - Work Done, PE Ke, Power, Circular Motion

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2,3 / 2,4 Reading Quiz - work done, PE KE, power, circular motion

• 1.

• A.

360J

• B.

120J

• C.

60J

• D.

18J

B. 120J
• 2.

### What is the average power used in moving an object with 20N for a distance of 6m in 3seconds?

• A.

3.33W

• B.

2W

• C.

6.66W

• D.

40W

D. 40W
Explanation
https://dl.dropboxusercontent.com/u/15735665/DIPLOMA/CH%20quiz%20images/MC%20images/2-4q2.JPG

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• 3.

### What aspect of a force distance graph give you the work done?

• A.

• B.

The area

• C.

Half the area

• D.

The second derivative

B. The area
Explanation
The work done is determined by the area under the force-distance graph. This is because work is defined as the product of force and displacement, and the area under the graph represents the product of force and distance. Therefore, the greater the area under the graph, the greater the work done. The gradient of the graph, on the other hand, represents the force applied, not the work done. The second derivative is not relevant to determining the work done.

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• 4.

### 2Kg mass is thrown with a velocity of 5m/s.  What is its KE?

• A.

5J

• B.

10J

• C.

25J

• D.

50J

C. 25J
Explanation
https://dl.dropboxusercontent.com/u/15735665/DIPLOMA/CH%20quiz%20images/MC%20images/2-4%20q4.JPG

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• 5.

### A 2Kg mass is given 100J of KE.  How high will it reach if it is thrown vertically upwards?

• A.

2.5m

• B.

5m

• C.

25m

• D.

50m

B. 5m
Explanation
KE turns into mgh
KE=mgh
100 =2x10xh
h=5m

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• 6.

### What is an elastic collision?

• A.

Where mass is conserved

• B.

Where energy is conserved

• C.

Where kinetic energy is conserved

• D.

Where potential energy is conserved

C. Where kinetic energy is conserved
Explanation
An elastic collision is a type of collision in which kinetic energy is conserved. This means that the total kinetic energy of the system before the collision is equal to the total kinetic energy after the collision. In an elastic collision, there is no loss of kinetic energy due to friction or deformation of the objects involved. Instead, the objects bounce off each other without any loss of energy, resulting in a conservation of kinetic energy.

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• 7.

• A.

40,000 N

• B.

200 N

• C.

100 N

• D.

50 N

C. 100 N
• 8.

• A.

0.5 m/s2

• B.

1m/s2

• C.

2m/s2

• D.

4m/s2

B. 1m/s2
• 9.

### When a bucket is being swung round in a circle in a verticle plane, what are the forces acting on the bucket when it is at the lowest point?

• A.

Weight and centripetal force,

• B.

Tension and centripetal force and weight

• C.

Weight and tension

• D.

Tension and centripetal force

C. Weight and tension
Explanation
Remember - centripetal force is only the result of other forces, it is NOT a force in its own right.

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• 10.

### Which areas of this work done, KE, PE, power and circular motion do you have the most difficult with?  Can you formulate a question?

• 11.

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• Current Version
• Nov 12, 2023
Quiz Edited by
ProProfs Editorial Team
• Oct 19, 2012
Quiz Created by
Gboulton

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