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s8p3.a
energy
Term | Definition |
---|---|
force | a push or pull exerted on an object in order to change the motion of the object;force has size and direction |
motion | an object's change in position relative to a reference point |
reference point | stationary object used to describe an object's motion |
speed | the distance traveled divided by the time interval during which the motion occurred |
velocity | the speed of an in a particular direction |
acceleration | the rate that the velocity changes over time;an object accelerates if its speed direction or both change |
friction | a force that oppose motion between two surfaces that are in contact |
net force | the combonation of all forces acting on a object |
balanceed force | stated when the net forces acting on an object epual to 0 |
unbalanced force | when the net force is not 0 |
intera | the tendency of an object to resist being moved |
gravity | a force of attraction between objects that is due to their masses |
work | the transfer of energy to an object by using a force that causes the objet to move |
machine | a device that helps do work either by overcoming a force or changing the direction of the object |
inclined plane | a simple machine that is strait |
wedge | a simple machine that is made of 2 inclined planes |
screw | consists of an inclined plane wrapped around a cylinder |
lever | consists of a bar that pivots at a fixed point |
pulley | consists of a wheel over which a rope chair or wire passes |
wheel and axle | a simple machine consisting of two cicurar of diffrent sizes |