1. Crash Course in Motion PS-5.3, 5.4, 5.5, 5.9, and 5.10

2. Speed and Velocity Review Speed Speed = distance / time v = d / t Distance covered in a certain amount of time Direction not needed Velocity Velocity = distance / time Must have direction

3. Speed and Velocity Review Practice Problems

4. Acceleration Acceleration = change in velocity / time Change in velocity = Velocity final - velocity initial a = (V f – V i ) / t Units are meters per second 2 m/s 2 Changes when speeding up, slowing down, or changing direction

5. Acceleration Practice Problems

6. Gravity An attractive force between any two objects Depends on mass and distance between objects More mass = more force Less distance = more force

7. Gravity Earth’s Gravitational Acceleration Always 9.81 m/s 2 Force(N) = mass(kg) * acceleration of gravity(m/s 2 ) F = mg g = acceleration due to gravity (a)

8. Gravity That gravitational force exerted on an object is called weight Weight(N) = mass(kg) * acceleration of gravity(m/s2) W = mg Weight is a force Mass is a measure of the amount of matter on object contains Equations are the exact same thing F w = ma g

9. Gravity Practice Problems

10. Gravity Projectile Motion How do you throw a ball? Your hand gives the ball horizontal motion After you hand leaves the ball, it is only affected by gravities pull down-vertical motion

11. Gravity Centripetal Force Net force exerted toward the center of a curved path Centripetal acceleration is acceleration toward the center of a circular path In a car on a curve, the centripetal force is the friction force between the tires and the road