Nln Study Guide

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Physics Vocab

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Momentum
 
An object traveling at a specific velocity has a qauntity. (all moving objects)
Conservation of momentum
 
The total momentum of an isolated system is always constant. When two objects collide, they transfer energy, it is not lost
Newton's First Law
 
Inertia, which states that objects in motion tend to stay in motion, and objects at rest tend to stay at rest. Resists any change in motion.
Newton's Second Law
 
Describes the relationship between force, mass, and acceleration.States that the force applied on an object equals the mass of the object times the acceleration of the object.F=ma (force= mass * acceleration)
Newton (N)
 
The unit that represents a force that accelerates a mass of 1 Kilogram 1meter per second.
Joule
 
Is the unit of energy equal to the work done by a force of one newton acting over a distance of one meter.
Friction
 
is the force that opposes the relative motion or tendency of such motion of two surfaces in contact.
Gravity
 
the force of attraction between all masses in the universe
Weight
 
is the force exerted upon an object by virtue of its position in a gravitational field
Lever-arm
 
The distance from the axis of rotation to the point where the force is exerted
Torque
 
the ability of a force that is applied perpendicularly to rotate an object around and axis, such as a ball on a string,
Energy
 
Defined as the abilit to do work.
Kinetic energy
 
energy associated with motion.
Potential energy
 
is the stored energy that a body has because of its position. ex. when you lift an object up
Work
 
defined as the product of the force applied to a object and the distance through which the force is applied.
Power
 
is the rate at which work is done.
inclined plane
 
a slanted surface used to raise an object.
Wedge
 
a moving incined plane
Screw
 
an inclined plane wrapped around a clinder
Lever
 
A simple machine that is free to move around a fulcrum when force is applied.
Pulley
 
A chain or rope wrapped around a wheel.
Wheel and axel
 
a lever that rotates in a circle
compound machine
 
a combination of two or more simple machines.
Efficiency
 
is the work done divided by the energy used to power the machine, or the comparison of work input to work output.
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