• The four fundamental forces are:• the gravitational force• the electromagnetic force• the strong nuclear force• the weak nuclear forceThe gravitational force is attractive. The force on an object due to the Earth's gravitational field is called its weight. The electromagnetic force can be both attractive and repulsive. The strong nuclear force only acts over short distances, up to about 3fm. It is attractive from about 0.5fm to 3fm and repulsive below about 0.5fm. The weak nuclear force has an even shorter range and is responsible for beta decay.
The Four Fundamental Forces
Read the text
Read the text and highlight anything you think is important. When you go on, the text is hidden and you answer from memory.
Specification: OCR Physics A (H156), AS-level, 3.5.1 Newton's laws of motion. Topic: Momentum.
Key terms in this lesson
- electric current
- The rate of flow of electric charge.
- potential difference
- The work done, or energy transferred, per unit charge as charge moves between two points in a circuit.
More in Momentum
- Newton's First Law of Motion.
- Newton's Second Law of Motion
- Newton's Third Law of Motion
- Linear Momentum
- Conservation of Momentum
- Explosions vs Collisions
- Elastic and Inelastic Collisions
- Air Bags
All 14 lessons in Momentum · All OCR AS-level Physics topics