This free-body diagram shows three forces that act on a stone hanging at rest from two strings.

Calculate the vertical component of the tension in each string.

This free-body diagram shows three forces that act on a stone hanging at rest from two strings.

Use your answer to part $b$ to calculate the weight of the stone.

This free-body diagram shows three forces that act on a stone hanging at rest from two strings.

Draw a vector diagram of the forces on the stone. This should be a triangle of forces.

This free-body diagram shows three forces that act on a stone hanging at rest from two strings.

Use your diagram in part $d$ to calculate the weight of the stone.

The force $\mathrm{F}$ shown here has a moment of $40 \mathrm{Nm}$ about the pivot. Calculate the magnitude of the force $\mathrm{F}$.

The asymmetric bar shown has a weight of $7.6 \mathrm{N}$ and a centre of gravity that is $0.040 \mathrm{m}$ from the wider end, on which there is a load of $3.3 \mathrm{N}$. It is pivoted a distance of $0.060 \mathrm{m}$ from its centre of gravity. Calculate the force $P$ that is needed at the far end of the bar in order to maintain equilibrium.

State what is meant by a couple

State what is meant by torque.

The engine of a car produces a torque of $200\mathrm{Nm}$ on the axle of the wheel in contact with the road. The car travels at a constant velocity towards the right:

Copy the diagram of the wheel and show the direction of rotation of the wheel, and the horizontal component of the force that the road exerts on the wheel.