Welcome to Physical Science

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Presentation transcript:

Welcome to Physical Science

Distance traveled divided by the time elapsed Speed Distance traveled divided by the time elapsed

speed at any specific instance speedometer Average Speed Instantaneous Speed speed at any specific instance speedometer Average Speed Total distance covered divided by elapsed time Ave Speed = Total Distance / Total Time

Speed Problem If a car travels at an average of 47.3 miles per hour, how long will it take to get from Ephraim to Las Vegas which is 300 miles away?

Velocity Speed plus Direction

An arrow representing velocity Vector An arrow representing velocity Length = speed of object Direction = direction of motion

Velocity Vectors

How fast is the plane moving in respect to the ground?

How fast is the plane moving in respect to the ground?

How fast is the plane moving in respect to the ground?

How fast is the plane moving in respect to the ground?

How fast is the plane moving in respect to the ground?

How fast is the plane moving in respect to the ground?

Change in velocity divided by the change in time Acceleration Change in velocity divided by the change in time Δ V A = —— Δ T Δ = Change

Acceleration due to gravity formula Free Fall Acceleration due to gravity formula D = ½ gt2 D = Distance g = gravity (9.8 m/s2) t = time (seconds) Gravity = 9.8 m/s2 or 32 ft/s2

If a rock is dropped from a building, and it takes 18 seconds to reach the ground, how tall is the building.

Assignment Due for Discussion of Monday Find a high place (bridge, building, cliff) and drop an object off of it. Determine how high you are. Then estimate to see if you answer seems reasonable.