Moments and Forces Quiz

What is the equation for the moment of a force about a point?

• Moment=Force×Distance

• Moment=Force÷Distance

• Moment=Distance÷Force

• Moment=Force+Distance

The Principle of Moments states that for a system to be in equilibrium:

• The total force acting on the system must be zero.

• The sum of clockwise moments equals the sum of anticlockwise moments.

• The forces must act along the same line of action.

• The distance of forces from the pivot must be equal.

A beam is in equilibrium when:

• The forces acting on it are equal and opposite.

• There is no force

• Both a and b.

• Neither a nor b.

If the moment is M, the force is F and the distance is d then rearrange the equation M=F×d for distance d

• d=M—F

• d=M·F

• d=M/F

• d=F+M

If the moment is M, the force is F and the distance is d then rearrange the equation M=F×d for force F

• F=M-d

• F=M·d

• F=M/d

• F=d+M

If the moment of a force is given as 50Nm and the distance from the pivot is 5m, what is the force?

• 5N

• 10N

• 50N

• 250N

As a spanner applies a force of 15N at a perpendicular distance of 0.3m from a nut. What is the moment of the force?

• 4.5Nm

• 45Nm

• 5Nm

• 0.45Nm

A beam is balanced by two weights: 10N at 2m from the pivot and another weight at 4m from the pivot. What is the second weight?

• 20N

• 5N

• 10N

• 15N

A seesaw is balanced with a 40N force applied 3m from the pivot on one side. If a force of 30N is applied on the other side, how far from the pivot must it act to maintain balance?

• 2m

• 3m

• 4m

• 5m

A moment of 120Nm is produced by a 40N force. What is the perpendicular distance from the pivot?

• 3m

• 2m

• 4m

• 5m