1. Force and Newton’s Laws of Motion

2. Force Force - A push or pull applied to an object
Net force - when two or more forces act on an object at the same time
Balanced/Unbalanced/Combined
Balanced - forces are equal Net force = 0
Unbalanced - forces unequal Net force = +
Combined Net force = two added together
Force

3. Static - two surfaces touching and keeping object at rest
Example: what’s keeping your couch in place
Sliding - two surfaces slide past one another
Sledding down a hill
Rolling - between rolling object and surface it rolls on
Skateboard moving on ground
Friction
Friction - force that opposes the sliding motion of two touching surfaces

5. Air resistance
Friction-like force that opposes motion of objects that move through air - depends on speed, size, and shape of object
“Fluid friction”

6. Newton’s Laws

7. Newton’s First Law of Motion
Also known as the “Law of Inertia”
An object in motion stays in motion or object at rest stays at rest until an unbalanced force acts on it.
Inertia - tendency to resist change

8. Newton’s Second Law of Motion
Net force acting on an object causes object to accelerate in direction of force
F = ma
Measured in Newtons

9. Newton’s Third Law of Motion
For every action (force), there is an equal and opposite reaction (force)
Momentum - property of moving object resulting from its mass and velocity

10. Gravity Any two masses that exert an attractive force on each other
Depends on mass & distance between objects
Greater the mass, stronger the gravitational force

11. Do heavy objects fall faster?
Video 1
Video 2

13. Projectile motion
Anything that is thrown (detention?) or shot through air
Follows a curved path
Horizontal AND vertical motion

14. Centripetal Force
Towards the center of a curved or circular path