Physics 9702/21 — October/November 2020

Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme

questions

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Topics Work, Energy and Power · Physical Quantities and Units · Dynamics · Forces, Density and Pressure · Kinematics · Deformation of Solids · +6 more

Q1Forces, Density and PressurePhysical Quantities and UnitsFree sample

Answer all the questions in the spaces provided.

(a)

(i)

Define the moment of a force about a point.

(ii)

Determine the SI base units of the moment of a force.

base units = ______

(b)

A uniform rigid rod of length $2.4\ \text{m}$ is shown in Fig. 1.1.

Fig. 1.1

The rod has a weight of $5.2\ \text{N}$ and is made of wood of density $790\ \text{kg m}^{-3}$ .

Calculate the cross-sectional area $A$ , in $\text{mm}^2$ , of the rod.

$A$ = ______ $\text{mm}^2$

(c)

A fishing rod AB, made from the rod in (b), is shown in Fig. 1.2.

Fig. 1.2

End A of the rod rests on the ground and a string is attached to the other end B. A support stick exerts a force perpendicular to the rod at point C. The weight of the rod acts at point D.

The tension $T$ in the string is in a direction perpendicular to the rod. The rod is in equilibrium and inclined at an angle of $56^{\circ}$ to the vertical.

The forces and the distances along the rod of points A, B, C and D are shown in Fig. 1.2.

(i)

Show that the component of the weight that is perpendicular to the rod is $4.3\ \text{N}$ .

(ii)

By taking moments about end A of the rod, calculate the tension $T$ .

$T$ = ______ $\text{N}$

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7 more questions

Q2Kinematics · Work, Energy and Power · Dynamics9M
Q3Dynamics · Work, Energy and Power8M
Q4Deformation of Solids · Work, Energy and Power · Physical Quantities and Units9M
Q5Waves5M
Q6Superposition5M
Q7Electricity · D.C. Circuits8M
Q8Particle Physics · Electric Fields7M

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