September 16, 2011 Convert 200 seconds into hours.

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Presentation transcript:

September 16, 2011 Convert 200 seconds into hours. How is mass different from volume? When you finish: Pick up the new note packet and HW packet from the back and side tables

Who was Newton? Sir Isaac Newton (1700s-ish) English Physicist Described 3 laws of motion Law- never shown to be false!

What is Motion? Occurs when an object changes its position Motion is one of the key topics in physics.

What is Motion? Everything in the universe moves. Relative motion: when you compare the motion of something to its surroundings. (ALL MOTION is relative!)

What is Motion? “Frame of Reference” What you compare your motion to Ex. The earth is moving relative to the stars around it. Ex. The car was moving 65 mph relative to it’s surroundings

Break Video Take 5 min to work on HW Pkt Part 2: Frames of Reference

What are some key words used when we describe motion? Distance: The space that an object travels between two points Displacement: How far you are from your starting point (INCLUDES DIRECTION)

What are some key words used when we describe motion? Speed: the distance an object travels in a certain amount of time Most objects do not travel at a constant speed (same speed over a period of time)

What are some key words used when we describe motion? Equation: Average speed = TOTAL distance/TOTAL time The metric units of speed include: m/s (meters per second), km/hr (kilometers per hour) In the US, we use mph (aka miles per hour or mi/hr) Speed = Distance Time

What are some key words used when we describe motion? Velocity: quantity that tells us the speed AND direction of an object Gives us a more complete description of motion than just speed

What are some key words used when we describe motion? The equation for velocity is the same as for speed, but you would also include the direction of motion EXAMPLES The car was moving at 65 mph (speed) The car was moving west at 65 mph (velocity) Or the car was moving 65mph 

Homework Part 3 of pkt, numbers 1-7 REVIEW for Monday’s Test Organize Bellringers to hand in Monday Starts 9/7, 6 dates total!