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- 1. Multiple Choice1. A _________is a simple machine with a fulcrum and a rigid bar.PivotLeverWedge
- 2. Multiple ChoiceWe use levers to make work easier.?TrueFalse
- 3. Multiple Choice
What is the anticlockwise moment acting on this crane?80,000Nm100,000Nm120,000Nm140,000Nm - 4. Multiple ChoiceUnit of force.MeterCentimeterNewton
- 5. Multiple ChoiceWhat is the moment acting on the seesaw?1.6Nm15Nm16N4Nm
- 6. Multiple ChoiceWhat is the moment produced by the 15 N?15 Nm (clockwise)150 Nm (anti - clockwise)1.5 Nm (anti - clockwise)0.15 Nm (clockwise)
- 7. Multiple ChoiceA seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?The larger person moving further away from the center.Moving the smaller person closer to the center.Moving the smaller person further from the center.Making the larger person do nothing.
- 8. Multiple ChoiceThe easiest way to open a heavy door is by applying the forceNear the hingesIn the middle of the doorAt the edge of the door far from the hingesAt the top of the door
- 9. Multiple Choice
Two masses of mass 10.0 and 6.0 kg are hung from massless strings at the end of a light rod. The rod is virtually weightless. A pivot (fulcrum) is placed off center and the system is free to rotate. If the 6.0 kg mass is 4.0 m away from the pivot, how far away is the 10.0 kg mass if the system is not rotating?
0.42 m
2.4 m
4.8 m
4.2 m
- 10. Multiple ChoiceA wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?7.5 Nm1.5 Nm750 Nm150 Nm
- 11. 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
- 12. Multiple Choice
The diagram shows a beam. Without any weights, the beam balances at its centre.
Three weights are hung as shown.
At which point does a load of 2 N balance the beam?
A
B
C
D
- 13. Multiple Choice
A nut can be loosened more easily with
a short spanner because a larger turning effect can be produced.
a long spanner because a larger turning effect can be produced.
a long spanner because a larger force can be produced.
a short spanner because a larger force can be produced.
- 14. 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
- 15. Multiple Choice
A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?
450 N
350 N
4.5 N
200 N
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