Force and Newtons Laws of Motion Force A

Force and Newton’s Laws of Motion

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

Friction - force that opposes the sliding motion of two touching surfaces 1. Static - two surfaces touching and keeping object at rest a. Example: what’s keeping your couch in place 2. Sliding - two surfaces slide past one another a. Sledding down a hill 3. Rolling - between rolling object and surface it rolls on a. Skateboard moving on ground

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

Newton’s Laws

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

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

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

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

Do heavy objects fall faster? - Video 1 - Video 2

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

Centripetal Force - Towards the center of a curved or circular path