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Science Starter!. Pick a new seat! No lab tables!. 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”

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Science starter
Science Starter!

Pick a new seat!

No lab tables!


Inertia
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
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
Examples

Newton's Bottle

Egg Drop

Table Cloth Chaos



Forces
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


Free body diagrams
“Free-Body” Diagrams

Example: A skydiver falling at constant velocity with an open parachute (ignore air resistance)

FT

v

a = 0 m/s2

Fg


Free body diagrams1
Free – Body Diagrams

1. 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

a = 0 m/s2

v

Fg


Examples1
Examples

1. A ball hangs motionlessly from a cord.

2. A ball rests in the palm of a hand.


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