Lesson 1
a push or pull on an object that can cause it to change motion
force
__________ can cause objects to start moving, speed up, slow down, stop, or change direction.
Forces
The greater the mass of an object + the greater the pull of gravity on a object= the _______ the weight of the object
greater
energy that comes from chemical changes
(examples- batteries for power, gasoline, food)
chemical energy
Energy has many forms and can ______ from one form to another.
change
a force that pulls any two objects toward one another, such as you towards the center of the earth
gravity
__________ is a measure of the pull (force) of the earth's gravity.
Weight
the ability to do work
energy
energy that comes from the flow of electricity
(example- a lamp burns because you plug it into a wall outlet)
electrical energy
Potential energy changes to kinetic energy when the object ________.
moves
the tendency of a moving object to stay in motion or a resting object to stay at rest
inertia
Weight is dependent on mass and ________.
gravity
energy that an object has because of position (examples- child at the top of a slide, boulder on the edge of a cliff)
potential energy
You use _______ every time you do work or move an object.
energy
AN example of potential energy is a swing at the highest point on a swing set. The swing has the ______ potential energy at this point. As the swing begins to move downward, it loses potential energy and gains kinetic energy. As the swing goes back up, the kinetic energy becomes potential energy.
most
a force that slows or stops the motion of moving objects
friction
_________ __________ discovered that a moving object will continue moving in a straight line until a force causes it to slow or stop, and that an object at rest will remain at rest until a force causes it to move.
Isaac Newton
energy of motion
(examples- a ball that has been kicked, swing moving downward)
kinetic energy
___________ energy is stored energy but is capable of being put into motion.
Potential
_________, _________, and __________ energy are forms of energy that can affect motion.
chemical, kinetic, electrical
The heavier ab object, the _______ the force needed to move it.
greater
_________ occurs when two objects rub against each other.
Friction
the kind of energy an object has because it can move or because it is moving
(examples- a bicycle that moves when you pedal it, wind-up toys)
mechanical energy
When anything moves, it has _______ energy.
kinetic
Chemical energy is a kind of ________ energy.
potential