# Shared Flashcard Set

## Details

8th -Forces and Motion quiz Ch 1
Forces and Motion
8
Science
05/25/2010

Term
 If you knew a car traveled 300 km in 3 hr you can figure out its ______.
Definition
 average speed
Term
 When an objects distance from another object is changing, it is
Definition
 in motion.
Term
 The formula for speed is
Definition
 S = d/tspeed equals distance divided by time
Term
 The rate at which velocity changes is called
Definition
 acceleration.
Term
 Why do planets have acceleration?
Definition
 They are always changing direction.
Term
 The SI unit of acceleration is
Definition
 meter per second per second
Term
 Short answer: People living at the equator are traveling at a speed of 1670 km/h as the Earth spins on its axis. Are these people being accelerated?
Definition
 Yes, The direction of the people at the equator is constantly changing.
Term
 A roller coaster is moving 5m/s at the top of a hill and 60m/s at the bottom of the hill, five seconds later. Find the average acceleration of the roller coaster and then find the average acceleration.
Definition
 Formula is A = end speed - start speed divided by time
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