# Shared Flashcard Set

## Details

8th Science Review December
acceleration, nature of force, friction, Newton's law
19
Physics
12/11/2012

Term
 Acceleration
Definition
 The rate at which velocity changes
Term
 Velocity has two components name them.
Definition
 direction and speed
Term
 Acceleration refers to increasing ______________ , decreasing _______________ or changing ___________.
Definition
 Acceleration refers to increasing speed, decreasing speed, changing direction
Term
 Any time the speed of an object ____________, the obect experiences __________________.
Definition
 Any time the speed of an object changes, the object experiences acceleration.
Term
 The change can be an _____ or a ________.
Definition
 The change can be an increase of a decrease.
Term
 A decrease in speed is called a ___________________, or a negative acceleration.
Definition
 deacceleration
Term
 If an object is changing direction is it accelerating?
Definition
 Yes, even if it is moving at a constant speed.  A care moving around a curve or chaning lanes at a constant speed is accelerating because it is changing direction.
Term
 The formula for Acceleration     Accleration=   Final velocity-Initial Velocity               Time
Definition
Term
 When a graph shows speed versus time as a slanted stratight line, the acceleration is _____________.
Definition
 Constant
Term
 When the object acclerates by different amounts each period, a grph of its accelration will _______be a straight line.
Definition
 NOT
Term
 A grpah of distance versus ___________ for an accelerating object is curved.
Definition
 time
Term
 True or False   If a train is solving down, it is accelerating.
Definition
 True, In science, acceleration refers to increasing speed, decreasing speed, or changing directions.
Term
 To find the acceleration of an object moving in a straight line, you must calculate the change in ______during each unit of time.
Definition
 velocity
Term
 A ferris wheel turning at a constant speed of 5m/s is or is not accelerating.
Definition
 is accelerating/  Any time an object is changing direction is also accelerating.
Term
 An airplane is flying west at 200 km/h.  Tow hours later, it is flying west at 300 km/h.  Its average acceleration is ____km/hr
Definition
 50 km/hr
Term
 ________occurs when the velocity of an object changes.
Definition
 acceleration
Term
 when you say that a race car travels nothward at 100 km/h, you are talking about its ________________
Definition
 velocity
Term
 ___________is a push or pull
Definition
 force
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