Motion
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Physics (Motion)
Motion occurs when an object changes its position Reference points allow us to determine whether an object has moved
Ex. Mailbox (the Mailman has moved, but the mailbox remains still).
Relative motion ~ you are moving relative to things around you
Ex. We are moving relative to the planets of our solar system
Distance – describes how far an object has moved.
Measured in meters (m)
Displacement is both the distance and direction that has changed from a starting point.
Ex. (See figure 2 on pg. 39)
What’s the difference between Distance and Displacement?
Distance is the total amount of meters an object has traveled Displacement is both the distance and direction moved.
To find speed, you must measure two quantities: Distance traveled Time it takes to travel that distance
Speed is measured in meters/second (m/s)
Instantaneous Speed
ex. Car moves at 96 m/s
Instantaneous speed means the speed being traveled at that moment
Average Speed is calculated as distance over time
Speed = distance time
Ex. If you travel 100 miles in 2 hours, your average speed would be 50 mph
Velocity describes both speed and direction of motion. Velocity measures DISPLACEMENT Average velocity is displacement divided by total time Velocity (v) = displacement (d) time (t)
Direction can be both positive and negative. Ex. Traveling 6.9 m North in 3 seconds, then 2.8 m South in 4 seconds Answer: 2.3 m/s North and .7 m/s South
How are velocity and speed different? velocity has direction, speed does not!
Motion occurs when an object changes its position Reference points allow us to determine whether an object has moved
Ex. Mailbox (the Mailman has moved, but the mailbox remains still).
Relative motion ~ you are moving relative to things around you
Ex. We are moving relative to the planets of our solar system
Distance – describes how far an object has moved.
Measured in meters (m)
Displacement is both the distance and direction that has changed from a starting point.
Ex. (See figure 2 on pg. 39)
What’s the difference between Distance and Displacement?
Distance is the total amount of meters an object has traveled Displacement is both the distance and direction moved.
To find speed, you must measure two quantities: Distance traveled Time it takes to travel that distance
Speed is measured in meters/second (m/s)
Instantaneous Speed
ex. Car moves at 96 m/s
Instantaneous speed means the speed being traveled at that moment
Average Speed is calculated as distance over time
Speed = distance time
Ex. If you travel 100 miles in 2 hours, your average speed would be 50 mph
Velocity describes both speed and direction of motion. Velocity measures DISPLACEMENT Average velocity is displacement divided by total time Velocity (v) = displacement (d) time (t)
Direction can be both positive and negative. Ex. Traveling 6.9 m North in 3 seconds, then 2.8 m South in 4 seconds Answer: 2.3 m/s North and .7 m/s South
How are velocity and speed different? velocity has direction, speed does not!
