3. Mechanics

Forces — Quiz

Test your understanding of forces with 5 practice questions.

Practice Questions

Question 1

Which statement best describes static friction?

Question 2

A $10\,\mathrm{kg}$ block on a horizontal surface with coefficient of kinetic friction $\mu_k=0.2$ is pulled by a force $F$ at angle $\theta$ above the horizontal. At what angle $\theta$ is the required magnitude of $F$ to maintain constant speed minimised?

Question 3

A uniform ladder of length $L$ leans against a smooth vertical wall at $60^\circ$ to the horizontal. If the coefficient of static friction between ladder base and ground is $\mu$, what minimum $\mu$ prevents slipping?

Question 4

Blocks A (4 kg) and B (5 kg) are connected over a frictionless pulley. A rests on a horizontal surface with coefficient of kinetic friction $\mu_k=0.3$. What is the acceleration after release?

Question 5

A box weighing $200\,\mathrm N$ is pressed against a vertical wall by a horizontal force $P$. If the coefficient of static friction is $0.5$, what minimum $P$ prevents the box sliding down?