5105 NA_Chap 5 Turning Effects of Forces

Which diagram best demonstrates the use of the moment of force?

The moment of a force causes an object to

Moment can be calculated using the equation:

The turning effect of a force on a door is greater when it is applied at

A heavy beam is resting on two supports. There are three forces acting on it.

The beam is in equilibrium.

Which statement is correct?

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?

Assuming the system is in equilibrium, calculate the missing distance d.

The beam in the diagram is not balanced.

Which changes balances the beam?

An empty glass is placed on a join between two tabes as shown. The glass remains stable.

Which point is the centre of gravity of the glass?

There is a hole in the handle of a hammer so that it can be hung from a nail.

The centre of gravity of the hammer is marked G.

Which hammer is the most unstable?