Physics 9702 · AS & A Level · Momentum and Newton's laws of motion
Momentum and Newton's laws of motion — practice question
Fig. 4.1 depicts a metal cylinder with height $4.5\,\text{cm}$ and base area $24\,\text{cm}^2$. The metal has density $7900\,\text{kg m}^{-3}$.
(a)[2]
Show that the cylinder has a mass of $0.85\,\text{kg}$.
(b)
As shown in Fig. 4.2, the cylinder sits on a plank that makes an angle of $40^\circ$ to the horizontal.
(c)[3]
The cylinder then slides down the plank with a constant acceleration of $3.8\,\text{m s}^{-2}$. A constant frictional force $f$ acts on the cylinder. Calculate the frictional force $f$.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “density is mass/volume” …