Force and Motion
1. How do forces affect motion?
A force is a push or pull that can make an object move.
Gravity is the force that pulls two objects together and pulls you toward the center of the earth.
Friction slows down or stops objects that are in motion.
2. How does energy affect motion?
Potential energy is energy that an object has because of position.
Kinetic energy is the energy an object has because of its motion.
Mechanical, electrical, and chemical energy are forms of energy that can affect motion.
3. How are work and motion related?
When a force moves an object, work is done.
Simple machines are tools with one or two parts that are used to make work easier.
Compound machines are made up of two or more simple machines; complex machines aer made of many simple and compound machines.
Force a push or a pull on an object that can cause it to change motion
Gravity a force that pulls any two objects toward one another, such as you toward the center of the earth
Inertia the tendency of a moving object to stay in motion or a resting object to stay at rest
Friction a force that slows the motion of moving objects
Energy the ability to do work
Potential energy energy that an object has because of position
Kinetic energy energy of motion
Mechanical energy the kind of energy an object has because it can move or because it is moving
Chemical energy energy that comes from chemical changes
Electrical energy energy that comes from the flow of electricity
Work the result of a force moving an object
Simple machine a machine made of one or two parts
Compound machine a machine made of two or more simple machines
Complex machine a machine made of many simple and compound machines