AQA GCSE Newton's 3rd Law(Physics)
Newton’s 3rd Law
Whenever two objects interact, they exert equal and opposite forces on each other.
Make sure you take careful note that the force arrows are on different objects under Newton’s 3rd law.
Under Newton’s 3rd law, these forces will always occur in pairs.
In the example above there are two forces F1 and F2.
F1 is an upward force of the table on the box.
F2 is a downward force of the box on the table
Both forces are equal in size, opposite in direction, and act on different objects!
Another example of Newton’s 3rd law is the force of gravitational attraction between the Sun and the Earth.
F1 is the Earth’s gravitational force of attraction on the Sun.
F2 is the Sun’s gravitational force of attraction on the Earth.
Both forces are equal in size, opposite in direction and are acting on different objects.
Practice Question
1.Define Newton’s Third Law
2.Describe how Newton’s Third Law applies when a swimmer pushes off the wall of a pool.
3.Describe the interaction forces between Earth and the Moon according to Newton’s Third Law.
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
Accordion Content
Accordion Content