Motion : Motion Speed, Velocity, and Acceleration
Frames of Reference : Frames of Reference The object or point from which movement is determined
Movement is relative to an object that appears stationary
Earth is the most common frame of reference
Questions : Questions What is the frame of reference for the sunset?
What is a frame of reference?
What is the most common frame of reference?
Question : Question When can you determine how fast you are going in a jet plane?
Motion : Motion Motion is a change in position relative to a frame of reference
Speed is the distance traveled in a given amount of time
Speed=distance
time
Speed : Speed The units for speed:
meters/second (m/sec)
kilometers/hour (km/hr)
Speed that does not change is constant speed
Average speed : Average speed Total distance divided by the total time
Formula:
Total distance
total time
Velocity : Velocity Speed in a given direction
Velocities in the same direction combine by adding
Velocities in different directions combine by subtracting
Interesting fact : Interesting fact Rockets are launched in the same direction of the earth’s rotation to get an extra boost of 1800 km/hr to its speed
Questions : Questions What is motion?
What is speed? How is it calculated?
What is average speed?
Questions : Questions How is velocity different from speed?
Which two factors determine an object’s velocity?
Acceleration : Acceleration The change in velocity
Acceleration is measured in m/sec/sec or m/sec2
Formula is:
(final velocity - original velocity)/time
Deceleration vs. Acceleration : Deceleration vs. Acceleration A decrease in velocity is deceleration or negative acceleration
A distance-time graph for acceleration is always a curve
Centripetal Acceleration : Centripetal Acceleration Acceleration directed toward the center of circular path
Questions : Questions What is acceleration?
What is the shape of a distance-time graph for acceleration?
What is centripetal acceleration?
Momentum : Momentum Momentum is equal to the mass of an object times its velocity
momentum= mass x velocity
Conserving Momentum : Conserving Momentum The law of conservation of momentum states that the total momentum is NOT lost, only transferred
Questions : Questions What is momentum?
What happens to momentum as the mass of a moving object increases?
What is the formula for momentum?
What is the law of conservation of momentum?