Monday, Oct 25, 2010

Review of Motion and Forces

Rate = quantity/time
Example of making money

Amount = rate * time
Rate = amount/time

Motion:
Rate=speed=distance/time
Amount = distance = rate* time => distance = speed * time

Worksheet on Problem Solving Strategy for distance, speed, time problems

Identify unknown:

How fast? speed
How far? distance
How long? time

Act-A-Graph Lab
Motion Plots, distance vs time
Constant speed gives a straight line on graph
Get speed from slope - the steeper the slope, the faster the speed

If the line is curved, look at the slope to see if it is increasing or decreasing in speed

Inertia
Ballistic Cart Demo review
Ball kept the same horizontal speed as the cart because no force acted on the ball to change its horizontal speed

Inertia: Tendency of an object to maintain its state of motion

Bill Nye: Inertia is a property of matter

Newton's 1st Law of Motion: An object at rest will stay at rest and an object in motion will continue moving in a straight line with constant speed unless acted on by an outside net force.

Jeep Rubicon and Intel Bunny Man demos
Car safety features

Railway track demo

Inertia mini-labs
Students write up egg demo in notebooks.