### Forces

First of all you need to understand the basics. What we call force is basically a push or pull action which either moves an object at rest or stops an object in motion.

### Scalars and Vectors

Scalars are physical Quantities. When these physical quantities are taken into consideration we must focus on their magnitude regardless of the direction.

Vectors are also physical quantities. These physical quantities are taken into consideration with magnitude and direction.

### Vector and scalar addition

Scalars can be added numerically. In case of vector we can either subtract or add according to the direction of force.

There are some forces on vector that occur in the same side but are separated by angle.

You can add the vector quantities just as shown above.

### Newton’s first Law of Motion

Newton’s first law of Motion defines inertia. It is that an object stays at rest or stays in motion in the same speed and direction until another unbalanced force acts upon it.

Now this tells us that a moving object could not change speed or direction until another force is applied to support it. Such as a moving car can be slowed down by the breaks. The breaks apply the force required to slow down the car. The same can be explained with an object at rest.

### Newton’s second Law of Motion

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

This can be simply understood by the equation Force=mass(acceleration) or F=ma.

Through this law we can also find the weight of an object by the equation weight=mass(gravity) or W=mg. Gravity will always be 9.8 ms^-2

### Newton’s third Law of Motion

Newton’s third law of Motion is known every where. It is that every action has an equal and opposite reaction. In this case we will take it literally. According to this when we pull or push on an object there would always be an opposing force such as friction with equal force.

very useful, thank you!

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