Types of forces

Applied Force

a force that is applied to an object by a person or object. For example, someone pushing a book across a table. The person is exerting applied force on the desk.

Normal Force

a force that is exerted from one object to another when they are in contact. Usually, they are perpendicular. For example, a book resting on a table

Frictional Force

the force exerted by the surface as an object moves across a surface or attempts to. Friction opposes motion. For example, when a book moves across a desk, the desk exerts friction force on the book.

Tensional Force

force sent through both ends of a wire, rope or string when both ends are pulled by forces on each side. The tension is equal on the objects on both sides of the string, therefore the string does not move.

Air Resistance

a type of frictional force exerted on objects as they travel through the air. It opposes the movement of the object. It is mostly noticeable with high speed objects, like skiing, and objects with large surface areas (like a parachute). Otherwise, air resistance is mostly neglected because of its small impact.

Spring force

a force exerted by a spring when it stretched/compressed. The more stretched/compressed the spring is, the more force it exerts. This shows when pulling a spring, and release it, it will try to go back to its original position (equilibrium).

Gravitional Force

the force in which a very large objects (like planets) pull objects towards its centre. All things on Earth experience gravity, since we are all pulled down to the ground (close to Earth’s centre as possible). It is also the weight (mass times acceleration of gravity) of an object.

Electrical force

the force where a negatively or positively charged objects interacts with other objects (go and learn chem if u cant understand that). Positive attracts negative, and vice versa. Same charged objects repel each other.

Magnetic force

the push or pull exerted by a magnet on magnetic materials. The push or pull depends on whether it is positive or negative, see above.