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- 1. Multiple Choice
State the principle of moments.
When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the same pivot.
When a system is in equilibrium, the sum of the total clockwise moment is greater the sum of the total anti-clockwise moment about the same pivot.
When a system is in equilibrium, the sum of the total clockwise moment is less than the sum of the total anti-clockwise moment about the same pivot.
When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the different pivot.
- 2. Multiple Choice
What is the anticlockwise moment acting on this crane?
80,000Nm
100,000Nm
120,000Nm
140,000Nm
- 3. Multiple Choice
What is the moment produced by the 15 N?
15 Nm (clockwise)
150 Nm (anti - clockwise)
1.5 Nm (anti - clockwise)
0.15 Nm (clockwise)
- 4. Multiple Choice
What is the resultant moment acting on the seesaw?
1.6 Nm (anticlockwise direction)
1.6 Nm (clockwise direction)
4 Nm (anticlockwise direction)
4 Nm (clockwise direction)
- 5. Multiple Choice
Assuming the system is in equilibrium, calculate the missing distance d
3.4 m
2.8 m
4.4 m
1.6 m
- 6. Multiple Choice
The figure below shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.
Which pivot positions allows the force F to be as small as possible?
A
B
C
D
- 7. Multiple Choice
At what distance should a 2N load placed from the pivot so that the see saw won't move?
0.2m
0.5m
0.45m
0.42m
- 8. Multiple Choice
Calculate the unknown force X!
4.0 N
6.0 N
10 N
12 N
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