Motion
a change in velocity
acceleration
the force of attraction between any two objects that have mass
gravity
the unbalanced force acting on an object is equal to the object's mass times its acceleration
Newton's Second Law of Motion
the most basic machines
simple machines
a wheel with a rope or belt around it
pulley
a change of position
motion
the cause of a change in motion
force
for every action force, there is an equal and opposite reaction force.
Newton's Third Law of Motion
when an object changes its position by moving in the directions of an applied force
work
inclined plane wrapped around a cylinder
screw
distance traveled divided by the time it took for motion to occur
speed
a force that resists the movement of one surface against another
friction
Newton's First Law of Motion
machines made up of two or more simple machines working together
compound machine
two inclined planes joined together
wedge
an objects speed and direction
velocity
all the forces acting on an object
net force
an object is in when the only force acting on it is the force of gravity
free fall
a fixed point around which a lever moves
fulcrum
a bar that can turn around a fixed point
lever
the tendency of an object to stay at rest; the tendency of an object in motion to continue moving with a constant velocity
inertia
forces that combine to create a net force greater than zero
unbalanced forces
an example of Newton's ( ) law is the launching of a rocket. The rocket is pushed upward by the force of the gas. The action of the gases pushing downwards caused the reactions of the rocket being pushed upward.
Third
machines help us do work by the force we put into work
redistributing
a lever or pulley that is connected to a shaft
wheel and axle