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MIS Chapter 12 Science Test
MIS Chapter 12 Science Study Stack
26
Science
8th Grade
10/03/2013

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Term
Acceleration
Definition
speed versus time
The rate at which velocity changes over time.
Term
Deceleration
Definition
decrease in speed
Term
When a hiker's velocity begins at 2.8m/s uphill and changes to 2.2 m/s uphill you know
Definition
that the hiker has had a NEGATIVE ACCELERATION because his speed has decreased
Term
Positive acceleration
Definition
a line sloping upward as time passes on a graph of speed of speed versus time
Term
Unbalanced forces
Definition
can cause an object's motion to change by stopping motion
Term
force
Definition
a push or pull acting on an object
Term
Forces are balanced when
Definition
the net force of an object equals 0 N
Term
Example of a balanced force
Definition
a porch swing hanging from a roof
Term
Balanced forces of an object create a net force of
Definition
O N
Term
All forces have
Definition
MAGNITUDE and DIRECTION
Term
Net Force
Definition
the combination of all forces acting on an object
Term
Newton
Definition
The SI unit of force
Term
Reference Point
Definition
a object that appears to stay in place and can be used to detect the motion of another object
Term
Motion
Definition
An object's change in position relative to a reference point
Term
If velocity of an object is constant (not changing)
Definition
forces acting on object are balanced
Term
Change in velocity
Definition
change in SPEED, change in DIRECTION, or both
Term
Velocity
Definition
the speed of an object in a certain direction
Term
If a bus is going 10m/hr down the street and turns a corner and continues traveling 10 m/hr in the NEW direction what changed?
Definition
VELOCITY changed
Term
Average Speed
Definition
Total distance traveled divided by the total time elapsed
Term
Friction
Definition
A force that acts against motion between two surfaces
Term
A worker pushing on a nonmoving box is an example of
Definition
being opposed by STATIC friction
Term
A box sliding on a floor
Definition
is opposed by KINECTIC friction
Term
Static friction
Definition
the force that opposes your push when you are UNABLE to move a heavy piece of furniture across the floor
Term
Kinetic Friction
Definition
Replaces static friction when an object starts MOVING
Term
Lubricant
Definition
A substance that can be put on surfaces to reduce the friction between the surfaces
Term
A ball is rolling down the sidewalk. It falls off the curb and drops into the grass where it stops moving. Why did the ball stop?
Definition
FRICTION was increased when the ball rolled onto the grass - the speed of the ball changed.
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