Ten questions. The result tells you which lessons you may skip.
A box rests on a level floor, and nothing pushes it. The friction on the box is
A block slides to the left over a fixed table. Friction on the block points
A \(10\,\text{kg}\) crate on a level floor has \(\mu_s = 0.5\). A horizontal push of \(30\,\text{N}\) acts on it. Take \(g = 10\,\text{m/s}^2\). The friction on the crate is
Limiting friction between two surfaces is proportional to
For the same pair of surfaces, which is correct?
A push on a block grows steadily from zero. On the graph of friction against the push, the corner marks the moment when
A \(2\,\text{kg}\) block on a level floor has \(\mu_s = 0.5\) and \(\mu_k = 0.4\). A horizontal push of \(18\,\text{N}\) acts on it. Take \(g = 10\,\text{m/s}^2\). Its acceleration is
A block rests on an incline at angle \(\theta\) without sliding. The friction on it is
A block just starts to slide on a plank tilted at \(37°\), where \(\tan 37° = 0.75\). The coefficient of static friction is
A cyclist pedals to speed up. Friction from the road on the rear tyre points