Ten questions. The result tells you which lessons you may skip.
A ball thrown straight up is at rest for an instant at its highest point. At that instant, the ball is
The forces on a body, drawn head to tail, leave a gap between the end of the last arrow and the start of the first. This shows that
A block of mass \(4\,\text{kg}\) is held at rest on a smooth incline of \(30°\) by a string parallel to the slope. Take \(g = 10\,\text{m/s}^2\). The tension is
A lamp of weight \(W\) hangs from a knot held by two equal strings, each at \(60°\) to the vertical. The tension in each string is
A load hangs from a knot held by two strings of different steepness. The larger tension is in
Three concurrent forces \(P\), \(Q\), \(R\) are in equilibrium. In Lami's theorem, the force \(P\) is divided by the sine of
A bob of weight \(40\,\text{N}\) hangs on a string and is held aside by a horizontal push of \(30\,\text{N}\). The tension in the string is
A light string passes over a light, frictionless pulley and holds a block of weight \(30\,\text{N}\) at rest. The pull at the other end of the string, held at an angle, is
A block of mass \(2\,\text{kg}\) rests on a level table. A string pulls it straight up with \(5\,\text{N}\) without lifting it. Take \(g = 10\,\text{m/s}^2\). The normal force on the block is
Two light spring balances are hooked one below the other, and a bag of mass \(3\,\text{kg}\) hangs from the lower one. The readings are