Like this presentation? Why not share!

# Chapter 9 Motion

## on Mar 20, 2008

• 1,203 views

### Views

Total Views
1,203
Views on SlideShare
1,197
Embed Views
6

Likes
0
12
0

### 1 Embed6

 http://dallenscience.tripod.com 6

### Report content

• Comment goes here.
Are you sure you want to

## Chapter 9 MotionPresentation Transcript

• Chapter 9 Motion and Energy
• Section 1
• Motion -Something is in motion if its distance from another object is changing.
• Reference Point- a place or object used for comparison to determine if something is in motion.
• Distance- the length of a path between two points
• Displacement- the length and direction that an object has moved from its starting point.
• Vector- a quantity that consists of both a magnitude and a direction.
• Section 2
• Speed- the distance the object travels per unit of time.
• Average speed= distance/ time
• Instantaneous speed- the rate at which an object is moving at a given instance in time.
• Velocity- speed in a given direction .
• Distance vs. Time
• Upward slope= moving away from starting position.
• Downward slope= moving toward starting position.
• Horizontal line= not moving.
• Section 3
• Acceleration - the rate at which velocity changes with time.
• Increasing speed
• Decreasing speed
• Changing direction
• = Final velocity - original velocity
• Time
• Velocity vs. Time
• Slope- the steepness of a line on a graph.
• A steep incline is an increase in speed.
• A steep decline is a decrease in speed.
• A horizontal line is maintaining a constant speed.
• Section 4
• Work- when an object is caused to move a certain distance.
• Energy- the ability to do work or cause change.
• Kinetic energy- the energy an object has due to its motion.
• KE= 1/2 x mass x speed 2
• Measured in Joules (J)
• Potential energy- stored energy that results from the position or shape of an object.
• Gravitational potential energy- depends on its weight and on its height relative to a reference point.
• GPE= weight x height
• Elastic potential energy- the potential energy of objects that can be stretched or compressed.
• Mechanical energy- an object’s combined kinetic energy and potential energy.
• ME = KE + PE
• Law of Conservation of Energy- energy cannot be created or destroyed but transformed from one form to another.