Physics 9702 · AS & A Level · Equilibrium of forces

Equilibrium of forces — practice question

(a)[2]

Distinguish between mass and weight by giving the difference.

(b)

An object $O$ with mass $4.9\text{ kg}$ hangs from a rope $A$ attached at point $P$. It is pulled to one side and kept in equilibrium by a second rope $B$, as shown in Fig. 2.1. Rope $A$ makes an angle $\theta$ with the horizontal, while rope $B$ is horizontal. The tension in rope $A$ is $69\text{ N}$ and the tension in rope $B$ is $T$.

(b(i))[2]

On Fig. 2.1, draw arrows showing the directions of every force acting on object $O$.

(b(ii).1)[3]

Calculate the value of the angle $\theta$.

(b(ii).2)[2]

Calculate the value of the tension $T$.

(ii.1)[3]

Calculate the value of the angle $\theta$.

(ii.2)[2]

Calculate the value of the tension $T$.

Worked solution & mark scheme

This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: Mass is the characteristic of a body that resists changes in motion / the amount of matter it contains / a measure of inertia.

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