Moments And Equilibrium

A force of 25 N acts perpendicular to a beam at a distance of 0.80 m from the pivot. Calculate the moment of this force about the pivot.

Which set of units is the correct SI unit for the moment of a force?

A spanner of length 0.50 m is used to turn a bolt. A force of 60 N is applied at the end of the spanner at an angle of 30° to the spanner shaft. Calculate the moment of the force about the bolt.

Why does a longer spanner make it easier to loosen a tight bolt compared with a shorter one?

Which statement best defines the centre of gravity of an extended body?

Where is the centre of gravity of a uniform rectangular metal plate located?

Which statement correctly expresses the principle of moments for a body in equilibrium?

A body is in full equilibrium. In addition to the sum of clockwise moments equalling the sum of anticlockwise moments, which further condition must be satisfied?

A uniform beam of weight 40 N and length 3.0 m rests horizontally on two supports, one at each end. A 120 N load is placed 1.0 m from the left support. Calculate the upward force exerted by the right support.

In a beam problem with two unknown support forces, which pivot choice simplifies the moment equation most effectively?

A student locates the centre of gravity of an irregular flat lamina by suspending it from a pin and marking the vertical shown by a plumb line. The procedure is then repeated from a different suspension point. Why is a second suspension necessary?

A child sits 1.5 m from the pivot of a horizontal seesaw. To balance the seesaw, an adult of weight 720 N sits on the opposite side at a perpendicular distance of 0.50 m from the pivot. Calculate the weight of the child.