Forces and Simple Machines

What is gravity?

• A force that pulls objects toward each other

• The resistance of motion when one object rubs against another

• A force that acts in the opposite direction of moving objects

• A ramp that assists moving heavy objects up and down heights

What is friction?

• A force that pulls objects toward each other

• The resistance of motion when one object rubs against another

• A force that acts in the opposite direction of moving objects

• A ramp that assists moving heavy objects up and down heights

What is air resistance?

• A force that pulls objects toward each other

• The resistance of motion when one object rubs against another

• A force that acts in the opposite direction of moving objects

• A ramp that assists moving heavy objects up and down heights

What is an inclined plane?

• A force that pulls objects toward each other

• The resistance of motion when one object rubs against another

• A force that acts in the opposite direction of moving objects

• A ramp that assists moving heavy objects up and down heights

What is a wheel and axle?

• A force that pulls objects toward each other

• The resistance of motion when one object rubs against another

• A ramp that assists moving heavy objects up and down heights

• A simple machine that helps make work easier

What is a lever?

• A force that pulls objects toward each other

• The resistance of motion when one object rubs against another

• A ramp that assists moving heavy objects up and down heights

• A machine used to increase force

What is a screw?

• A force that pulls objects toward each other

• The resistance of motion when one object rubs against another

• A machine that converts rotational motion into linear motion

• A ramp that assists moving heavy objects up and down heights

What is a pulley?

• A force that pulls objects toward each other

• The resistance of motion when one object rubs against another

• A machine that converts rotational motion into linear motion

• A wheel on a fixed axle used to reduce the time and energy taken to lift heavy objects

How does gravity affect objects?

• By pulling them toward each other

• By resisting their motion

• By slowing them down

• By assisting their movement up and down heights

What is the purpose of an inclined plane?

• To pull objects toward each other

• To resist motion

• To slow down objects

• To assist in moving heavy objects up and down heights