Newton’s 1 st Law Inertia An object at rest will stay at rest, and an object in motion will stay...

Newton’s 1st LawInertia

An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity unless acted on by an unbalanced force.

Think Seat Belts!! If you are NOT wearing your seatbelt and you get hit from behind, your body will propel forward hitting the windshield.

Newton’s 2nd LawFnet = ma

If an unbalanced force acts on a mass, that mass will accelerate in the direction of the force. You must have a (Δv/ t = a)

2 N 8 N

a

Since 8N is greater than 2N, the unbalanced force is to the right so the acceleration is to the right.

What is the resultant force?

Newton’s 3rd LawAction - Reaction

For every action force there is an equal and opposite reaction force.

Example: If you punch a wall with your fist in anger, the wall hits your fist with the same force. That’s why it hurts!

Action-reaction forces cannot balance each other out because they are acting on different objects.

Let’s get some formulas ready to use on the problems.

1. Big 5 Kinematic Equations 2. Acceleration formula 3. Force Formula 4. Weight = Fg=ma 5. Pythagorean Th. 6. Inverse Tangent(TOA)

Acceleration on the “y” = ay

• Fg = wt = mg• use 9.8m/s2 to calculate ( mg )

• Reminder: Fg = m x g

N = kg x m/s2

Acceleration on the “x” = ax

• d = Vi t + ½ a t2 a = 2 d t2

• Vf2 = Vi2 + 2 ad a = Vf2- Vi2

2d

0

0

Acceleration can be solved….

Basic formula

a = Δv t