1. Chapter 12
Mr Hodesblatt

2. Newtons’s laws Every change you feel is caused by a force
Many of these were first laid out by Sir Issac Newton in his laws of motion
They apply to almost everything we can perceive and see

3. Newton’s First law
An object at rest stays at rest and an object in motion maintains its velocity unless it experiences a net force
Objects change their state of motion only when a net force is applied
Eg book sliding on a carpet will stop
Objects tend to maintain their state of motion
Friction will cause an object to stop after a time

4. Inertia In short-Matter resists any change in motion
Inertia-tendency of an object to resist a change in motion unless an outside force acts on the object
All objects resist some changes in motion, so every object has some inertia
In short-Matter resists any change in motion

5. Inertia A common example of inertia is observed in cars
What happens when a car turns?
You slide to the side
What happens when a car stops?
You continue to move
Why?
Your body wants to continue moving even though the car has stopped or moved
Seat belts help to stop this by adding an unbalanced force in order to balance out the force keeping you going forward.

6. Newton’s 2nd law
These forces acting on a object that we have been discussing thus far can be quantified
2nd law describes the effect of unbalanced forces on an object
Net Force=Mass X Acceleration
Greater mass means an object accelerates less
A greater mass will have more force even moving at the same speed of an object moving at the same speed
Force is measured in newtons

7. F=MA
M= 175 kg a=.657 m/s^2. F?