# Motion Chapter 2. Motion Distance ◦ How far an object has moved ◦ Total path Displacement ◦ Shortest path between 2 points ◦ Vector – requires magnitude.

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Motion Chapter 2

Motion Distance ◦ How far an object has moved ◦ Total path Displacement ◦ Shortest path between 2 points ◦ Vector – requires magnitude and direction ◦ Can never be longer than the distance

Speed Rate of change of position ◦ Change in position over time

Velocity Rate of change of velocity Vector – requires speed and direction Changes if ◦ Speed changes ◦ Direction changes

Calculating Velocity Units are m/s, km/h, cm/yr, etc.

Acceleration Rate of change of velocity ◦ How fast does the velocity change Vector-requires magnitude and direction Changes if ◦ Velocity changes ◦ Direction changes

Calculating Acceleration Units are m/s 2

MOTION GRAPHS

Position-Time Graph Shows how position changes with time Slope is equal to velocity

Velocity-Time Graph Shows how velocity changes over time Slope is acceleration

Motion and Forces Force ◦ Push or pull ◦ Causes or changes motion Balanced vs. Unbalanced forces ◦ Tug of war

Tug of War

Moving Furniture

Inertia Tendency of object to resist a change in its motion Relationship to mass?

Newton’s First Law of Motion Also called the Law of Inertia An object in motion will stay in motion and an object at rest will stay at rest until an unbalanced force acts on it.

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