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Forces, Motion and Machines

Science

Forces, Motion and Machines Chapter Video

Forces, Motion and Machines Chapter Video

acceleration

a change in velocity with respect to time
acceleration Simple Definition

effort force

the force used on a simple machine
effort force Simple Definition

force

the push or pull exerted on an object
force Simple Definition

friction

the force that opposes motion between two surfaces that are touching
friction Simple Definition

fulcrum

fixed point on which a lever pivots
fulcrum Simple Definition

gravity

the attractive force between all objects that have mass
gravity Simple Definition

inclined plane

a simple machine with a flat, sloped surface
inclined plane Simple Definition

inertia

the tendency of objects to resist any change in motion
inertia Simple Definition

lever

a simple machine that consists of a bar that pivots on a fixed point
lever Simple Definition

load

a device that uses electrical energy to do work
load Simple Definition

motion

a change in an object’s position
motion Simple Definition

position

the location of an object
position Simple Definition

pulley

a simple machine made of a wheel with a rope around it
pulley Simple Definition

screw

a simple machine made of an inclined plane wrapped around a cylinder
screw Simple Definition

simple machine

a device that changes a force with one movement, like a lever, inclined plane, wedge, screw, wheel and axle, or pulley
simple machine Simple Definition

speed

the distance an object travels per unit of time
speed Simple Definition

velocity

speed and direction of a moving object
velocity Simple Definition

wedge

a simple machine made of one or two inclined planes
wedge Simple Definition

weight

measure of the force of gravity on an object
weight Simple Definition

wheel and axle

a simple machine made of a wheel with a rod joined at its center, they rotate together
wheel and axle Simple Definition

work

the use of force to move an object over a distance, its unit is the Joule (J)
work Simple Definition

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