Force basics
What is a force?
A push or pull on an object
What does “attract” mean?
To pull objects together
A machines require ______ to work
energy
What is a machine?
A device that makes work easier and saves time
Name a machine you use every day
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What are the two types of forces?
Contact forces and non-contact forces
What does “repel” mean?
To push objects away
Name one type of energy
Mechanical, electrical, chemical, or light
What is a simple machine?
A machine with one or few parts
What energy do most modern machines use?
Electrical energy
What is a contact force?
A force that happens when two objects touch
What type of force is gravity?
A non-contact force
What type of energy comes from the Sun?
Light energy
Name one simple machine
Pulley, lever, inclined plane, etc.
What effect of force is happening when you catch a football
It stops moving
What is a non-contact force?
A force that happens when two objects interact, but don’t touch
What does gravity do to objects on Earth?
It pulls the object toward the center of Earth
What type of energy is stored in food?
Chemical energy
What does a pulley do?
Helps lift heavy objects by changing the direction of force
What kind of energy happens when you use a skateboard
Mechanical
Name two effects a force can have on an object
Change shape, break objects, start moving, stop movement
Give an example of a non-contact force in real life
Gravity, magnets, etc.
Explain mechanical energy
Energy an object has because of its motion and position
A seesaw is an example of which simple machine?
A lever
Name one important invention: printing press, steam engine, radio, or computer—what did it help improve?
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