 Moment of a Force
2 years ago
thephysicsgrove
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Practice 15 QuestionsShow answers
• Question 1
900 seconds
Q. If the moment required to loosen a nut on the wheel of a car has a magnitude of 60.0 Nm, what minimum perpendicular force must be exerted by a mechanic at the end of a 45.0 cm wrench to loosen the nut?
.666 Nm
133.3 N
66.7 N
13.3 Nm
• Question 2
900 seconds
Q. Find the magnitude of the moment produced by a 5.0 N force applied to a door, at a perpendicular distance of 65 cm from the hinge.
75 Nm
3.25 Nm
6.3 Nm
8.75 Nm
• Question 3
900 seconds Q. What is the distance of the 14 kg mass on the right from the pivot, if it balances with the two masses on the left? (3 kg mass is 65 cm from pivot, 10 kg mass is 35 cm from pivot).
0.65 m
0.56 m
0.79 m
0.39 m
• Question 4
30 seconds
Q. You apply your maximum force to a wrench to tighten a bolt. Unfortunately, the wrench breaks exactly in half. You continue to try to use the shortened wrench to tighten the bolt. Which sentence is correct?
The moment is halved, because max distance from pivot is halved.
The moment is halved, because force is halved.
The moment is doubled, because the max distance from pivot is halved.
The moment is doubled, because the force is halved.
• Question 5
30 seconds Q. A 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.
• Question 6
300 seconds
Q. A wrench is used to tighten a nut. A 15 N perpendicular force is applied 50 cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the turning effect of the force applied to the wrench?
7.5 Nm
1.5 Nm
750 Nm
150 Nm
• Question 7
45 seconds
Q. The least force is required to open a heavy door is by applying the force
Near the hinges
In the middle of the door
At the edge of the door furthest from the hinges
At the top of the door
• Question 8
300 seconds
Q. A 800 N man is playing on a seesaw with his son who has a weight of 200 N. If the child is sitting 3 meters away from the fulcrum, how far will the man have to sit from the fulcrum to balance the seesaw in equilibrium?
0.75m
3m
1.5m
1m
• Question 9
45 seconds
Q. What is the unit for moment of a force?
Nm
N
W
J
• Question 10
60 seconds Q. In the diagram above, two masses, one with mass m, the other with mass M = 2m are resting on a uniform plank of length L that pivots at its midpoint. If the mass m is at the far end of the plank, how far away from the pivot should the mass M be to balance the plank in a horizontal position shown?
L/2
L/3
L/4
L/6
• Question 11
60 seconds
Q. When an object is experiencing a net turning effect of a force,
it is in dynamic equilibrium.
it is in static equilibrium.
it is rotating.
it is translating.
• Question 12
30 seconds Q. If a force of magnitude F can be applied in four different 2-D configurations (P,Q,R, & S), select the cases resulting in the maximum and minimum turning effects on the nut. Answer in order of (Max, Min).
(Q, P)
(P, R)
(R, S)
(Q, S)
• Question 13
30 seconds Q. What is the net moment of the two forces about point P?
20  Nm clockwise
20 Nm anti-clockwise
40 Nm clockwise
40 Nm anti-clockwise
• Question 14
900 seconds Q. A lever is used to raised a mass with a weight of 12 Newtons, using only 4 Newtons of force. The distance of the load from the fulcrum is 1 metre. What is the distance of the force from the fulcrum?
0.333 m
1 m
3 m
36 m
• Question 15
900 seconds Q. What is the moment acting on the seesaw?