Ten questions. The result tells you which lessons you may skip.
A \(5\,\text{kg}\) block on a smooth floor is pulled with \(25\,\text{N}\) at \(37°\) above the horizontal (\(\sin 37° = 0.6\), \(\cos 37° = 0.8\), \(g = 10\,\text{m/s}^2\)). Its acceleration is
The same force now pushes the block at \(37°\) below the horizontal. Compared with the pull, the normal force of the floor is
A \(1\,\text{kg}\) block and a \(5\,\text{kg}\) block are released together on two identical smooth inclines. Which reaches the bottom first?
A light string joins two blocks that are speeding up together on a smooth table. The tension at the two ends of the string is
A \(3\,\text{kg}\) block on a smooth table is pulled over an edge pulley by a hanging \(2\,\text{kg}\) block (\(g = 10\,\text{m/s}^2\)). The tension in the string is
In an Atwood machine with masses \(6\,\text{kg}\) and \(4\,\text{kg}\) (\(g = 10\,\text{m/s}^2\)), the acceleration of each block is
A block hangs from a movable pulley, and the free end of the string moves down by \(40\,\text{cm}\). The block rises by
A \(60\,\text{kg}\) person stands on a scale in a lift that is going up and slowing down at \(2\,\text{m/s}^2\) (\(g = 10\,\text{m/s}^2\)). The scale reads
A bob hangs from the roof of a car that speeds up at \(a\). Seen from inside the car, the bob is at rest because
A fielder draws the hands back while catching a ball. Compared with a stiff catch, this