Mathematics 9709 · AS & A Level · Newton's laws of motion
Newton's laws of motion — practice question
A block is resting on a rough horizontal plane, and the coefficient of friction between the block and the plane is $1.25$.
(i)[2]
State, with a reason, whether the minimum vertical force needed to move the block is greater than or less than the minimum horizontal force needed to move it.
(ii)[2]
A horizontal force of steadily increasing magnitude $P\text{ N}$ and fixed direction is applied to the block. The weight of the block is $60\text{ N}$. Find the value of $P$ when the acceleration of the block is $4\text{ m s}^{-2}$.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Shows that the frictional force is smaller than the driving force.” …