Science Study Guide Chapter 4 Forces & Machines

Science Study Guide Chapter 4 Forces & Machines

a bar that turns on a point

lever

motion

a change in position

a push or a pull

force

work

a force moving an object over a distance

the inclined plane on a screw

thread

a flat, sloped surface

inclined plane

the weight of the object being moved

load

the force that resists the movement of objects against each other

friction

machine

an object that makes work easier

a wheel with a groove that can hold a rope

pulley

the point on which a lever turns

fulcrum

screw

an inclined plane wound around an axle

the force that pulls objects toward the earth

gravity

effort

the force applied to cause a simple machine to do work

one or more inclined planes used to force materials apart

wedge

the measurement of the amount of matter in an object

mass

a simple machine that combines fixed pulleys and movable pulleys

block and tackle

a wheel with an axle, or rod, running through the wheel

wheel and axle

Why should Christians value work and machines?

Christians glorify God when they invent machines that help others. They are also obeying God’s command to wisely use the earth and its resources

a simple machine that allows you to use less force when lifting an object because the rope moves a greater distance

block and tackle

determines the amount of effort needed on a lever

the distance between the effort and the fulcrum