# Tate N. - Laws of Motion Project

by
**Tatenei**

Last updated 8 years ago

** Discipline: **

Science ** Subject: **

Physics
** Grade:**

9

Newton's Laws of Motion

First Law(Law of Inertia):Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

This law is also called the law of inertia, because inertia is the tendency of an object to do nothing or remain unchanged.

An example of inertia is riding in a car. When the driver stops quickly, your body tends to lean. Because of inertia, your body wants to keep traveling forward, even though the car is not.

This means that an object at rest will stay at rest, and an object in motion will stay in motion with a constant speed and direction unless acted upon by an unbalanced outside force.

This means that the accelerationof something is related to that object's mass and the force that is applied to it.

This law can also be expressed as a fourmula:

How to apply Newton's Second Law:Say you have a 10kg bowling ball. how much force would it require to accelerate down the lane at 3m/s sq.?

Second Law:The rate of change of momentum of a body is proportional to the resultant force acting on the body and is in the same direction.

Third Law:When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

This means that for every action, there is an equal and opposite reaction.

F = ma

If a tennis ball is tossed at wall, it will bounce back. The ball applies a force to the wall, and the wall applies an equal and opposite force.

The people in the car have inertia

The stack of blocks has inertia

This law can be seen almost everywhere. Something like a book sitting on a table is an example. The book is being pulled down by gravity (the action), and the table is pushing back on the book with the same force(equal and opposite reaction).

Ball pushes on wall (action),wall pushes back (equal andopposite reaction).

First, find mass and acceleration.m= 10 kg a=3m/s^2Next write the fourmula: F=maThen substitute. F=10kg*3m/s^2Finally, solve. F=30 N

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