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Force & Motion
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Gravity
Terms in this set (24)
Force
an action that can change the motion of an object. A push or a pull is an example of a force.
Newton
the unit used to measure force
Net Force
the combination of all of the forces acting on an object.
Balanced Force
forces that are opposite in direction and equal in size, cause no change in motion, and the net force equals 0.
Unbalanced Force
forces that are not opposite and equal. Forces that cause a change in motion
Motion
the act or process of changing position or place
Newton's 1st Law
states that an object at rest will stay at rest unless it is acted upon by an unbalanced force. An object in motion will continue to move in the same direction and with the same speed unless acted upon by an unbalanced force.
Newton's 2nd Law
states that the acceleration, a, of an object is directly related to the net force, F, applied to the object and inversely related to the mass, m, of the object. Shown by F = ma
Newton's 3rd Law
states that forces occur as equal and opposite pairs. For every action force there is an equal and opposite reaction force.
Acceleration
is found by dividing the change in the velocity of the object by the change in time
Velocity
a measure of speed in a given direction
Speed
the distance an object moves per unit of time
Inertia
the tendency of an object to resist a change in motion
Mass
the amount of matter in an object
Weight
the force due to gravity-Equal to the product of the object's mass and the acceleration of gravity (w = mg). At the surface of Earth, the acceleration of gravity is 9.80 m / s² which is the constant used in the equation for g.
Gravitational force
is a force between any two objects. The strength of the force is related to the mass of the objects and the distance between them.
Terminal velocity
occurs when the force of air resistance becomes large enough to balances the force of gravity. At this instant in time, the net force is 0 Newtons; the object will stop accelerating.
Frictional forces
work against motion
Work
is the transfer of energy when an applied force moves an object over a distance. For work to be done the force applied must be in the same direction as the movement of the object and the object must move a certain distance. (W = Fd)
Joule
the unit used to measure work
Simple Machines
machines that work with one movement. The 6 simple machines are lever, pulley, inclined plane, wedge, screw, and wheel and axle.
Effort Force
the force applied to a simple machine
Resistance Force
the force exerted by the machine
Mechanical advantage
is the number of times a machine multiplies the effort force
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