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:

State the resultant torque on the wheel. Explain your answer.

(b) 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:

(iii) The diameter of the car wheel is $0.58 \mathrm{m}$. Determine the value of the horizontal component of the force of the road on the wheel.

Explain what is meant by the centre of gravity of an object.

A flagpole of mass $25 \mathrm{kg}$ is held in a horizontal position by a cable as shown. The centre of gravity of the flagpole is at a distance of $1.5 \mathrm{m}$ from the fixed end.

Write an equation to represent taking moments about the left-hand end of the flagpole. Use your equation to find the tension T in the cable.

A flagpole of mass $25 \mathrm{kg}$ is held in a horizontal position by a cable as shown. The centre of gravity of the flagpole is at a distance of $1.5 \mathrm{m}$ from the fixed end.

Determine the vertical component of the force at the left-hand end of the flagpole.

State the two conditions necessary for an object to be in equilibrium.

A metal rod of length $90 \mathrm{cm}$ has a disc of radius $24 \mathrm{cm}$ fixed rigidly at its centre, as shown. The assembly is pivoted at its centre.

Two forces, each of magnitude $30 \mathrm{N}$, are applied normal to the rod at each end to produce a turning effect on the rod. A rope is attached to the edge of the disc to prevent rotation. Calculate:

The torque of the couple produced by the $30 \mathrm{N}$ forces

A metal rod of length $90 \mathrm{cm}$ has a disc of radius $24 \mathrm{cm}$ fixed rigidly at its centre, as shown. The assembly is pivoted at its centre.

Two forces, each of magnitude $30 \mathrm{N}$, are applied normal to the rod at each end so as to produce a turning effect on the rod. A rope is attached to the edge of the disc to prevent rotation. Calculate:

The tension $\mathrm{T}$ in the rope.

State what is meant by the torque of a couple.