1. Newton 1st Law of Motion

2. Review: Forces _________________________________________
Combination of all forces acting on a body
Body does not accelerate
Remains at rest or constant velocity
Net force = 0
Body accelerates (changes rest or motion)
Net force not equal to 0N
Occurs only when there are unbalanced forces present

3. SIR ISAAC NEWTON
Described the relationship between _________________________________________ and _______________________________________ in 3 laws.

4. INERTIA: the tendency of an object…
to _________________________________________ until an outside force acts on the object.
or if the object is moving:
to resist a change in __________________________ until an __________________________________________ _ acts on the object.
Basically, objects want to keep on doing what they’re doing.

5. INERTIA is related to an object’s MASS. Mass is a measure of inertia.
SI unit for mass is __________________________(____)
More ______________ means more _________________
Objects with __________________________ masses can be accelerated with ________________________ forces.
A baseball will accelerate much faster when hit by a bat than a bowling ball hit by the same bat.

6. NEWTON’S FIRST LAW OF MOTION:
an object at rest _____________________________________________ unless it experiences an unbalanced force
and
an object in motion _____________________________________________ unless it experiences an unbalanced force.
Also called the ____________________________

7. Examples
Using ‘inertia’, explain what happens to the dummies in the crash vehicle clip.

8. Examples What is happening when you slip and fall on ice. Friction:
Inertia:
Force: