# Dynamics

### Force:

A force is a pull or push that one object exerts on another which produces or tends to produce a motion, stops or tends to stop a motion.

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Force = Mass * Acceleration

SI unit: Newton (N)

F =MA

### Force Can Cause:

• A Stationary object to start moving.
• A moving object to increase speed.
• A moving object to decrease speed.
• A moving object to change its direction of motion.
• An object to accelerate or decelerate.

Balanced Forces:

Forces acting on an object are balanced if the resultant force is zero.

Unbalanced Forces:

Forces acting on an object are unbalanced if the resultant force is not zero.

### Newton’s First Law Of Motion:

Every object will continue its state of rest or uniform motion in a straight line unless a resultant force acts on it to change its state.

### Newton’s Second Law Of Motion:

When a resultant force acts on an object of constant mass the object will accelerate and move in the direction of the resultant force. The product of the mass and acceleration of the object is equal to resultant force.

Force = Mass × Acceleration

### Newton’s Third Law Of Motion:

For every reaction there is an equal and opposite reaction and these forces act on mutually opposite bodies.

In simpler words: Action and reaction are equal in magnitude but opposite in direction.

### Friction:

The force which resists the motion of one surface on another surface is known as friction.

Remember: In order to reduce friction add lubricants like : lubricating oil, graphite or water.

### Related Articles

1. Jasmine says:

Hi, just want to ask, do you have any tips on scoring and studying in order to get distinction for physics? Thanks and much appreciated. 🙂

Jasmine, we would recommend you to practice more Past Papers, this will not only help you in revising different concepts but also help you in knowing how to attempt questions with different marks. Good luck with your distinction!

1. owais says:

i just want to ask that the information given by ur website about topics are these enough to clear our concepts plz reply bcz its making me really confusing.

Dear Owais, our revision notes are made to assist you in learning different concepts with concise revision points. These should be studied along with your main course books recommended by your teacher.

2. These notes are much easy to understand
Thank you