Newtons Laws

28/3/17

1. Who is Isaac Newton - Isaac Newton was a famous Mathematician/Scientist and discovered gravity and invented the 3 Laws of motion.

2. List the three laws of motion - First one is the law of inertia the second is force = Mass x Acceleration and the last one is equal and opposite.

The Law Of Inertia - When an object has stopped moving it will stay at stationery and when it is in motion it will stay moving the only way for it to stop being in motion is if an unbalanced force e.g(Friction/Drag) it will slow down and the only way it will speed up is if a push force acts upon it e.g the wind blowing at your back. It is just like if you were up in space your non stop moving or in motion just like if your in motion on a swing your non stop moving unless a unbalanced force acts upon you like friction of your feet dragging on the ground to slow down.
 Acceleration - To figure out the force being acted upon a certain object you times the mass by the speed/acceleration. You can also figure out the net force when you have an unbalanced force by just figuring out how much bigger one of the forces are than the other e.g say the friction force is 2000 N and the push force is 3500 N there is a net force of 1500 N going forward and if the forces are balanced e.g 500 N for friction and 500 N for push there is No Net Force. Every force is measured in Newtons (N).

Action and Reaction - For every action there is an equal and opposite reaction. This means that in every action there is a pair of forces acting upon on the to objects. The size of the force on the first object must be the same on the second object which is where they get the equal part from. When you sit down your body puts a force on the chair and the chair puts a force up towards your body which lets you stay still and means they are equal. The same as if you put a book on a table the table pushes a force up and the book pushes a force down.

3 Give a sports example of each law.

The Law Of Inertia - When swinging on a swing you stay in motion which is what the law of inertia is all about.

Acceleration - To find out how fast the rally car is going.

Action and Reaction - The two forces on both sides of a scrum must be equal to hold the scrum up.

30/3/17

1. Describe Newtons Law 1 - The Law of inertia is the first law and is about when something is in motion it will stay in motion unless an unbalance force acts upon it.
Example - When your still at the start of a sprint your in inertia cause your stopped cause your hands are still and when you remove your hands you over come inertia because your weight is falling forward.

2. Describe Newtons Law 2 - The law of acceleration is about when accelerating you enter a constant motion.
Example - When accelerating in motion you need to continue running past the finish line why slowing down so you don't injure yourself. to find force use the formula force=mass x acceleration.

3. Describe Newtons Law 3 - The third law is action and reaction and every action has a equal and opposite reaction.
Example - When the sprinter is pushing off the ground they will need to push down and back so you can go forward.

BOS/Base Of Support.
VLG/ Vertical Line Of Gravity.
COG/Centre Of Gravity.