MATTER IN MOTION

SPEED

• The rate at which something moves
• formula: speed = Distance/Time
• If Someone walks south 0.5 miles in 5 min.
• What is the speed?
• A cheetah's top speed is 70 mph

AVERAGE SPEED

• Total distance traveled divided by the total time elapsed.
• Formula: Total Distance/Total Time
• What is the average speed of an arrow that takes
• 1.25 s to hit a target 75m away?
• A horse runs 20 miles per hour or 29 feet per second.

VELOCITY

• The speed of something in a direction
• Formula: Velocity = Distance/Time
• A boat traveled 100 meters in 120 seconds
• Acceleration of freefall on the moon is 1.6 meters/sec

ACCELERATION

• Increase in the rate or speed of something
• Galileo was the first to show all objects fall at a constant acceleration
• Formula: acceleration = final velocity - initial velocity over time.
• A car gains a velocity of 80 m/s. Calculate the acceleration at 5s.

NET FORCE

• The overall force on an object
• F = ma
• A force of 20 N acts upon a 5 kg block.
• Calculate the acceleration of the object.
• This was Newton's first law of physics