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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
What role do SEATBELTS play in car safety?
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.