2,3 / 2,4 Reading Quiz - Work Done, PE Ke, Power, Circular Motion
2,3 / 2,4 Reading Quiz - work done, PE KE, power, circular motion
Questions and Answers
- 1.
20N pushes a box 6m in 3 seconds. What is the work done by the force?
- A.
360J
- B.
120J
- C.
60J
- D.
18J
Correct Answer
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
Correct Answer
D. 40WExplanation
https://dl.dropboxusercontent.com/u/15735665/DIPLOMA/CH%20quiz%20images/MC%20images/2-4q2.JPGRate this question:
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- 3.
What aspect of a force distance graph give you the work done?
- A.
The gradient,
- B.
The area
- C.
Half the area
- D.
The second derivative
Correct Answer
B. The areaExplanation
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.Rate this question:
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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
Correct Answer
C. 25JExplanation
https://dl.dropboxusercontent.com/u/15735665/DIPLOMA/CH%20quiz%20images/MC%20images/2-4%20q4.JPGRate this question:
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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
Correct Answer
B. 5mExplanation
KE turns into mgh
KE=mgh
100 =2x10xh
h=5mRate this question:
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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
Correct Answer
C. Where kinetic energy is conservedExplanation
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.Rate this question:
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- 7.
A speed boat is able to travel with a maximum velocity of 20m/s. The power rating of the engine is 2000W. What is the sum of the frictional forces on the boat?
- A.
40,000 N
- B.
200 N
- C.
100 N
- D.
50 N
Correct Answer
C. 100 N -
- 8.
What is the acceleration of a 40Kg boy sitting on the edge of a merry-go-round. The tangetial speed is 2m/s. The diameter of the merry go round is 8m. What is the acceleration he experiences.
- A.
0.5 m/s2
- B.
1m/s2
- C.
2m/s2
- D.
4m/s2
Correct Answer
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
Correct Answer
C. Weight and tensionExplanation
Remember - centripetal force is only the result of other forces, it is NOT a force in its own right.Rate this question:
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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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Nov 12, 2023Quiz Edited by
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Oct 19, 2012Quiz Created by
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