Answers to AQA GCSE Work Done (Combined science)
Answers to Practice Questions
1.A man lifts a box of fruit with a weight of 200N from the ground to 1.5m above the ground. Calculate the work done.
Work done = force x distance moved in the direction of the force
Work done = 200N x 1.5m = 300J
2. A ferromagnetic crane lifts some scrap iron of weight 20kN upwards from the ground, travelling a distance of 350cm. Calculate the work done.
350cm = 3.5m
20kN = 20,000N
Work done = force x distance moved in the direction of the force
Work done = 20000N x 3.5m = 70000J
3. 40000J of work is done to push a car of weight 7000N along a length of road. Calculate how far the car travels.
Work done = force x distance moved in the direction of the force
Distance = work done/force
Distance = 40000/7000 = 5.7m
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4. Sketch a graph to show the relationship between work done and force. Put work done on the Y axis and Force on the X axis.
Absorption and Emission of EM Radiation
JJ Thomson and Plum pudding model
Ernest Rutherford and the Nuclear Model
Niels Bohr changing the Nuclear Model
Discovering the Proton and Neutron
Measuring radiation from radioactivity
Radiation types and properties
Random nature of radioactive decay
Radioactive contamination or irradiation
Hazards of contamination and irradiation
Studies on the effects of radiation on humans
