David Sang and Graham Jones Solutions for Chapter: Forces: Vectors and Moments, Exercise 5: Questions

A wheelbarrow is loaded as shown in Figure.

Calculate the force that the person needs to exert to hold the wheelbarrow's legs off the ground.

A wheelbarrow is loaded as shown in Figure.

Calculate the force exerted by the ground on the legs of the wheelbarrow (taken both together) when the gardener is not holding the handles.

A traditional pair of scales uses sliding masses of $10 \mathrm{g}$ and $100 \mathrm{g}$ To achieve a balance. A diagram of the arrangement is shown in Figure. The bar itself is supported with its centre of gravity at the pivot. Calculate the value of the mass $\mathrm{M}$, attached at $\mathrm{X}$.

A traditional pair of scales uses sliding masses of $10 \mathrm{g}$ and $100 \mathrm{g}$ To achieve a balance. A diagram of the arrangement is shown in Figure. The bar itself is supported with its centre of gravity at the pivot. State one advantage of this method of measuring mass.

A traditional pair of scales uses sliding masses of $10 \mathrm{g}$ and $100 \mathrm{g}$ to achieve a balance. A diagram of the arrangement is shown in Figure. The bar itself is supported with its centre of gravity at the pivot. Determine the upwards force of the pivot on the bar.

Figure shows a beam with four forces acting on it.

For each force, calculate the moment of the force about point $\mathrm{P}$.

Figure shows a beam with four forces acting on it.

State whether each moment is clockwise or anticlockwise.

Figure shows a beam with four forces acting on it. State whether the moments of the forces are balanced.