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

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Presentation transcript:

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

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

Speed and Velocity Review Practice Problems

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

Acceleration Practice Problems

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

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)

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

Gravity Practice Problems

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

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