Edexcel A Level Physics:復習筆記6.10 Maintaining Circular Motion

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年10月11日上午10:43

Maintaining Circular Motion

An object moving in a circle is not in equilibrium, it is constantly changing direction
- Therefore, in order to produce circular motion, an object requires a?resultant force?to act on it
- This resultant force is known as the?centripetal force?and is what keeps an object moving in a circle

The centripetal force?F?is defined as:

The resultant force towards the centre of the circle required to keep a body in uniform circular motion. It is always directed towards the centre of the body's rotation.

6-10-hammer-throw_edexcel-al-physics-rn

The tension in the string provides the centripetal force F to keep the hammer in circular orbit

Note:?centripetal force and centripetal acceleration act in the?same direction
- This is due to?Newton’s Second Law
The centripetal force is?not?a separate force of its own
- It can be any type of force, depending on the situation, which keeps an object moving in a circular path

Examples of centripetal force 12.2.1.4-Table-showing-examples-of-centripetal-force

Exam Tip

Make sure you are able to give examples of centripetal forces, understanding that many types of familiar forces (e.g., gravity, electric) can act as centripetal forces.

A classic example that often comes up in your magnetic fields topic is the magnetic force on a charged particle, which is always centripetal. This is because the force acts at 90° to the charged particle's velocity, causing it to move in a circle.

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