WorksheetsREVIEW MOMENTS
Total questions: 15
Worksheet time: 40mins
What is the equation for moments?
Moment = force x perpendicular distance from pivot
Moment = mass x velocity
Moment = force x distance
Moment = force x parallel distance from pivot
What is the unit of the moment of a force?
N
N/kg
N/m
Nm
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.
Assuming the system is in equilibrium, calculate the missing distance d
3.4 m
2.8 m
4.4 m
1.6 m
Jack has a weight of 300 N and sits 2.0 m from the pivot of see-saw. Jill has a weight of 450 N and sits 1.5 m from pivot. Who will move down?
Jack
Jill
Both of them
None of them
When an object is in equilibrium, which equation is true?
Clockwise moment = anticlockwise moment
Clockwise moment + anticlockwise moment = 0
Clockwise moment / anticlockwise moment = 0
Clockwise moment + anticlockwise moment = resultant force
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
A see-saw is made by resting a long plank of wood with its centre of gravity on the barrel.
A boy sits on one side of the barrel and a girl sits on the other side so that the see-saw is balanced.
Which of the following statements must be true?
boy’s weight = girl’s weight
distance x = distance y
moments of the girl = moments of the boy
moment of the girl > moment of the boy
A uniform plank rests on a pivot at its centre. Two children P and Q sit on the plank in the positions shown.
The mass of child P is 25 kg. The plank is balanced. What is the mass of child Q?
20 kg
25 kg
31 kg
45 kg
A
B
C
D
Two types of the moment of force are
clockwise and anti-clockwise
stable and unstable
neutral and charged
forward and backward
If the distance from the pivot is zero, then the turning effect will be
zero
negative
doubled
half
