A Level Physics Revision: All of Forces | Moments, Torque, Centre of Gravity, Archimedes Principle

Forces in physics refer to the interactions between objects that cause changes in their motion or shape. They are described using Newton's laws of motion and are crucial in understanding the behavior and motion of objects in the physical world. Here are some common types of forces in physics:

1. Gravitational Force: This force is responsible for the attraction between objects with mass. It is the force that keeps planets in orbit around the sun and objects grounded on the Earth.

2. Normal Force: The normal force is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface, preventing objects from falling through it.

3. Frictional Force: Friction is the resistance that opposes motion when two objects come in contact. It occurs due to the roughness of surfaces. Frictional force acts parallel to the surfaces in contact and can either be static (preventing motion) or kinetic (opposing motion).

4. Tension Force: Tension is the force exerted by a string, rope, or a similar object when it is pulled at both ends. It transfers force uniformly along its length and is responsible for maintaining the integrity of the object.

5. Applied Force: An applied force is the force exerted on an object by a person or object. It can be used to push, pull, or move an object in various directions.

6. Spring Force: When an elastic object, such as a spring, is compressed or stretched, it exerts a force according to Hooke's law. This force is directly proportional to the displacement from the object's equilibrium position.

7. Electrical Force: Electrical forces exist between charged particles, such as electrons and protons. Like charges repel each other, while opposite charges attract.

8. Magnetic Force: Magnetic forces result from the interaction between moving charged particles (currents) or magnetic fields. Magnets can attract or repel each other based on their poles.

9. Buoyant Force: Buoyant force acts on objects immersed in a fluid (liquid or gas) and is directed upward. It is responsible for the ability of objects to float in a fluid and is determined by the density of the fluid and the displaced volume.

These are just a few examples of forces in physics. Understanding and analyzing these forces is essential in the study of mechanics and other branches of physics, allowing us to predict and explain the behavior of objects in various scenarios.

Resolving forces in depth video: https://youtu.be/GqyI3zl9P_oArchimedes Principle in depth video: https://youtu.be/mDavwJOiYJYChapters:00:00 F=ma, The net force02:18 The Newton02:40 Free Body Diagrams, Types of Forces08:05 Net Force Example Question11:48 Drag16:06 Experiment: Motion of a ball through a viscous liquid18:32 Resolving Forces on a slope21:42 Centre of gravity, experiment23:48 Moments26:20 Non perpendicular Moments29:05 The Principle of Moments30:44 Force Couples and Torque32:00 Triangle of forces34:19 Density and Pressure35:00 Pressure at a height, h.37:00 Archimedes PrincipleThis is excellent A Level Physics revision for all exam boards including OCR A Level Physics, AQA A level Physics, Edexcel A Level Physics, CIA Cambridge International A Level Physics, Eduqas etc.