Force
What is force?
A push or pull acting on an object.
What is motion?
A change in position.
The measure of the change in velocity of a moving object.
Define gravity.
A force of attraction between things that have mass.
What are the 4 types of friction?
Static, sliding, rolling, and fluid.
OH NO!
What causes motion?
Force.
What is a decrease in speed called?
Deceleration
DOUBLE POINTS!!
!
Static, sliding, and rolling friction occur between _____ surfaces.
Solid
______ force is force that is applied by a person or object.
Applied
Define Inertia.
A tendency for objects in motion to stay in motion and objects at rest to stay at rest.
DOUBLE POINTS!!
!
What is Newton's Law of Gravity?
A law stating that gravity is a force of attraction between all objects in the universe and that the strength of gravity is greater when masses of objects are greater or distances between objects are shorter.
OH NO!
LOSE POINTS!
What kind of force is shown when an object is sitting on a table?
Normal force.
Speed shows how _______ or ______ something moves.
Fast; Slow
Give an example of when acceleration changes.
(ex) When a car speeds up
Give an example of how gravity works.
dropping something from a certain height, something falling from the sky, etc.
Fluid friction occurs in _______ and _______.
Liquids and gases
This kind of force is applied when two objects slide against each other.
Frictional force
Direction is defined as...
the location of something relative to something else.
True or False: Acceleration is only when an object increases speed.
False
Anything that has _____ exerts gravity.
Mass
Name an example of static friction.
A book resting on a table, a car parked on a hill, a ladder leaning on a wall, etc.