Table of contents | |
Introduction | |
Contact Forces | |
Non-Contact Forces | |
Exam Tips | |
Solved Example |
Forces can have an effect on bodies in several different ways:
Some examples of these changes are:
Important forces to be familiar with:
All forces can be categorised into one of two types:
Examples of contact forces include:
Friction:
Air resistance:
Tension:
Reaction force:
Examples of contact forces
Examples of non-contact forces include:
Gravitational attraction:
Electrostatic force:
Magnetic force:
Step 1: Identify the contact forces
(i) Ben pulls on a rope attached to the sledge producing tension in the rope
(ii) The ground supports Ben and the sledge with a reaction force
(iii) There is friction between the sledge and the ground which opposes the motion
(iv) There is also friction between Ben’s shoes and the ground allowing Ben to climb the hill without slipping down
(v) A very small force due to air resistance slows Ben’s motion up the hillStep 2: Identify the non-contact forces
(i) The gravitational attraction between the Earth and Ben pulls Ben and the sledge downwards
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