Work done and energyAQA A-Level Further Maths: Mind map

Exam questions on Work done and energy

1. A crate of mass 20 kg is pulled in a straight line across a horizontal floor by a horizontal force of 70 N. The crate moves 12 m. A constant resistance of 30 N opposes the motion.
   The crate starts from rest. Find its speed after it has moved 12 m.2 marks
2. A ball of mass 0.4 kg is thrown vertically upwards from ground level with an initial speed of $14\text{ m s}^{-1}$. Air resistance may be ignored. Take $g=9.8\text{ m s}^{-2}$.
   Use conservation of energy to find the speed of the ball when it is 6 m above the ground.2 marks
3. A skier of mass 70 kg starts from rest at the top of a straight slope inclined at $20^\circ$ to the horizontal and slides 80 m down the slope. A constant resistance of 50 N acts up the slope. Take $g=9.8\text{ m s}^{-2}$.
   Find the speed of the skier at the bottom of the slope.3 marks