Students will be able to
- understand that Newton’s third law of motion applies to pairs of objects rather than to individual objects,
- understand that all forces are forces between two interacting objects,
- understand that forces between two interacting objects always occur in pairs,
- recall that pairs of objects exert equal magnitude forces on each other,
- recall that the forces exerted by a pair of objects on each other act in opposite directions,
- recall that a pair of forces consistent with Newton’s third law must be of the same type (such as gravitational or electromagnetic),
- recall that some of the forces that pairs of objects exert on each other act only during contact and some others act without requiring contact,
- recall that the forces that pairs of objects exert on each other can be mutually attracting or mutually repelling; gravitational forces can only attract but electromagnetic forces can either attract or repel.
Students should already be familiar with
Students will not cover
- forces other than gravitational, reaction, and tension forces,
- mechanisms of production of forces,
- velocity changes of objects due to forces that they exert on each other.