Forces and Equilibrium
Authored by Charles Martinez
Physics
10th Grade
NGSS covered
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35 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
State the principle of moments
A 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.
B 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.
C 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.
D 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 QUESTION
30 sec • 1 pt
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?
Tags
NGSS.MS-PS2-2
NGSS.MS-ETS1-1
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What is the anticlockwise moment acting on this crane?
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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
Tags
NGSS.MS-PS2-2
NGSS.MS-PS2-4
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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 QUESTION
2 mins • 1 pt
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
Tags
NGSS.MS-PS2-2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the size of the moment shown by the black arrow?
30 Nm
36 Nm
40 Nm
60 Nm
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