Post on 05-Jan-2016
Science Starter! Find your new seat!
Science Starter! Find your new seat!
Inertia
Tendency of an object to resist a change in motion.
Proportional to an object’s mass:Large mass High Inertia Difficult to move
Small mass Low Inertia Easy to move
Newton’s First Law of Motion
“Law of Inertia”
“Every object continues in a state of rest, or a state of motion in a straight line at constant speed, unless acted upon by an unbalanced force.”
Examples
Inertia Ring
Newton's Bottle
Egg Drop
Table Cloth Chaos
Forces
Force: Push or pull (measured in Newtons [N])
Contact Forces: Forces that exist between surfaces that are touching
Field Forces: Forces that exist between surfaces that are not touching
FT
Fg
“Free-Body” Diagrams
v a = 0 m/s2
Example: A skydiver falling at constant velocity with an open parachute (ignore air resistance)
Free – Body Diagrams1. Object is drawn as a dot.2. Force Vectors (): labeled and pointing in direction of force.3. Arrows drawn starting from the dot, pointing away.* 4. Draw acceleration and velocity vectors next to diagram.
Example: Free-body diagram of a sky-diver with an open parachute
FT
Fg
v a = 0 m/s2
Examples
1. A ball hangs motionlessly from a
cord.
2. A ball rests in the palm of a hand.