Answers to AQA GCSE Levers
Practice questions
1.Use the image below to help you to answer the following question
Explain using ideas of levers why using a wheelbarrow makes it easier to move a load such as heavy soil.
The line of action of force is a long distance from the pivot. This means that the wheelbarrow acts as a force multiplier. This makes it easier to carry the heavy load.
2. Use the image below to help you to answer the following question
Explain why using a longer oar is helpful when rowing the boat
The hollow ring on the side of the boat that the oar passes through will act as a pivot. Using a longer oar will increase the distance between the line of action of the force and the pivot, this causes a force multiplier effect.
3. Use the image below to answer the following question
Identify the pivot in the diagram above and also indicate what both men could do to allow them to lift the rock more easily
The pivot is marked, both men should move their hands along the pole, away from the pivot. This will increase the distance between the pivot and where the line of action of force is.
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
Different half lives of radioactive isotopes
Nuclear Fission Chain Reaction
Writing nuclear fission equations