Browse Work, energy & power

1. 1
   A horizontal force of $20\text{ N}$ pulls a box a distance of $5\text{ m}$ across a horizontal floor, in the direction of the force. Find the work done by the force. (2 marks)
   Level 1 · 2 marksTry it→
2. 2
   A constant horizontal force of $45\text{ N}$ pushes a trolley $8\text{ m}$ across a smooth horizontal floor.
   
   Find the work done by the force. (2 marks)
   Level 1 · 2 marksTry it→

1. 1
   Find the kinetic energy of a particle of mass $4\text{ kg}$ moving at $6\text{ m s}^{-1}$. (2 marks)
   Level 1 · 2 marksTry it→
2. 2
   A ball of mass $0.5\text{ kg}$ is raised through a vertical height of $8\text{ m}$. Taking $g = 10\text{ m s}^{-2}$, find the gain in gravitational potential energy. (2 marks)
   Level 1 · 2 marksTry it→
3. 3
   Find the kinetic energy of a ball of mass $0.8\text{ kg}$ moving at $5\text{ m s}^{-1}$. (2 marks)
   Level 1 · 2 marksTry it→

All 15 kinetic and potential energy questions →

1. 1
   A crane does $60000\text{ J}$ of work in raising a load in $20\text{ s}$. Find the average power developed. (2 marks)
   Level 1 · 2 marksTry it→
2. 2
   A motor does $5400\text{ J}$ of work in $30\text{ s}$.
   
   Find its average power. (2 marks)
   Level 1 · 2 marksTry it→