Browse Work, energy & power

1. 1
   A force of $30\text{ N}$ acts on a box at an angle of $60^\circ$ above the horizontal and pulls it a distance of $8\text{ m}$ along horizontal ground. Find the work done by the force. (3 marks)
   Level 2 · 3 marksTry it→
2. 2
   A crate of mass $12\text{ kg}$ is raised vertically at constant speed through a height of $3\text{ m}$. Taking $g = 10\text{ m s}^{-2}$, find the work done against gravity. (3 marks)
   Level 2 · 3 marksTry it→
3. 3
   A car travels $200\text{ m}$ along a straight level road against a constant total resistance of $350\text{ N}$. Find the work done against the resistance. (2 marks)
   Level 2 · 2 marksTry it→

All 19 work done by a force questions →

1. 1
   A car moves along a straight road at a constant speed of $25\text{ m s}^{-1}$. Its engine works at a rate of $20000\text{ W}$. Find the driving force produced by the engine. (2 marks)
   Level 2 · 2 marksTry it→
2. 2
   A car travels along a level road at a constant speed of $25\text{ m s}^{-1}$ against a total resistance of $600\text{ N}$.
   
   Find the power developed by the engine. (3 marks)
   Level 2 · 3 marksTry it→
3. 3
   A cyclist works at a constant rate of $250\text{ W}$ and moves at a constant speed of $5\text{ m s}^{-1}$ on level ground.
   (a) Find the driving force the cyclist produces. (2 marks)
   (b) Write down the total resistance to the cyclist's motion. (1 mark)
   Level 2 · 3 marksTry it→