# Physical Science Section 2.1

## Presentation on theme: "Physical Science Section 2.1"— Presentation transcript:

Physical Science Section 2.1
Describing Motion Physical Science Section 2.1

Motion You can tell something moved if it has changed position relative to a stationary object Reference Point- stationary object- helps you know how far something moved Relative motion- motion may not be obvious Sitting in your chair, you are not moving relative to the room You are moving relative to other planets

Motion Distance- how far on object moves
Measured in meters Displacement- distance and direction of object’s change in position from the starting point

Motion Speed- Distance an object travels per unit time
Speed = distance/ time Units of speed: m/s Units of distance: m Units of distance s Constant speed- when an object neighter speeds up nor slows down Cruise control

Motion Most of the time speed changes over time
Average Speed- a good way to describe speed of motion when speed in changing Total distance traveled divided by total time of travel

Motion Instantaneous speed- speed at a specific point in time
Speedometer Distance-time graph- slope represents speed Plotting a distance-time graph Distance on vertical Time on horizontal Make sure scales make sense with your data Plot data points Draw line connecting points

Motion Velocity- speed and direction
Must include N, E, W, S or left, right, up, down Velocity changes continually around a race track