23 terms

# Motion, Forces, and Newton's Laws

Review of Motion, Forces, and Newton's Laws
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Newton's First Law (Inertia)
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Force
any push or pull that gives energy to objects and causes a change in motion
Gravity
the force that pulls objects toward each other
Weight
the effect of gravity on an object's mass
Free Fall
an object falling under the influence of gravity
Air Resistance
an upward force due to gravity
Friction
a force that one object puts on another when two objects rub past each other
Sliding Friction
occurs when solid surfaces slide over each other
Rolling Friction
occurs when an object rolls over a solid surface
Fluid Friction
occurs when an object moves through a liquid or a gas
Newton's Second Law
Acceleration is produced when a force acts on a mass. The greater the mass the greater the force need to make it move
Formula for Force
A force can be measured by multiplying and object's mass by its acceleration
Newtons
the unit used to measure the amount of force
Acceleration
a change in speed or velocity
Unbalanced Forces
when two objects have an unequal force and/or mass, which starts a movement, stops a movement, or changes a direction
Balanced Forces
caused when equal forces acting on one object in opposite directions.
Newton's Third Law
For every action there is an equal and opposite re-action.
Momentum
the strength of an objects motion
Projectile
an object that is thrown due to a force
Reference Point
a stationary object in which motion is determined from
Speed
the distance an object moved divided by the time it took to travel
Velocity
the speed and direction of an object
Centripetal Force
The force that keeps objects moving in a circle or arc