12 exam-style questions (50 marks) in three tiers. Try each one on paper first, then check the model answer and mark scheme.
Chapter 6 notes12 questions · 50 marks
Showing 12 of 12 questions
Recall and simple application
State the principle of conservation of energy.
Calculate the kinetic energy of a 4.0 kg trolley moving at 2.0 m/s.
A 0.30 kg ball rests on a ledge 2.0 m above the ground. Calculate its gravitational potential energy (g = 10 m/s²).
State the unit of power and express it in base energy-per-time terms.
Structured, exam-style
A worker pushes a trolley with a 60 N force for 15 m in the direction of the force. (a) Calculate the work done. (b) The push lasts 30 s. Calculate the worker’s power.
A 0.20 kg fruit drops from a branch 5.0 m above the ground. Ignoring air resistance, calculate (a) the potential energy given up, (b) the fruit’s speed just before landing (g = 10 m/s²).
A rubber ball dropped from 1.5 m rebounds to 1.1 m. Use the principle of conservation of energy to explain why it never rebounds to its original height.
A 50 kg student climbs a staircase of vertical height 4.0 m in 8.0 s. Calculate (a) the energy transferred to her gravitational store, (b) her useful power (g = 10 m/s²).
Data, evaluation and explanation
An archery arrow of mass 0.50 kg leaves a bow at 40 m/s. (a) Calculate its kinetic energy. (b) Ignoring air resistance, calculate the maximum height it could reach if fired vertically (g = 10 m/s²). (c) State one reason the real maximum height is lower.
A 1200 kg car brakes steadily from 15 m/s to rest. The braking force is 9000 N. (a) Calculate the car’s initial kinetic energy. (b) Calculate the braking distance, assuming all the kinetic energy is removed by the braking force. (c) State one assumption used in (b).
A 0.10 kg stone on a string swings from rest, released 0.45 m above its lowest point. (a) Calculate the gravitational potential energy given up by the time it reaches the lowest point. (b) Calculate its speed there, ignoring air resistance. (c) On the other side it only rises 0.40 m. Calculate the energy transferred away and name the stores it ends up in (g = 10 m/s²).
A kettle is rated 2.0 kW. (a) Express this in watts. (b) It boils in 3.0 minutes. Calculate the energy transferred. (c) A second kettle transfers 540 kJ in 4.5 minutes. Calculate its power in kW and compare it with the first kettle.
Next step
A 30-mark paper set out like a school paper, with a separate mark scheme. Give yourself 40 min.
Question paper
30 marks · 40 min · 4 pages
5 multiple-choice questions and structured questions with answer lines. Chapter 6 (energy stores and the four transfer pathways, Ek = ½mv², Ep = mgh, conservation of energy, W = Fd, P = E/t).
Mark scheme
PROAnswers · Marking points · 2 pages
Model answers with a mark for each creditworthy point — for marking at home or in class.