Understanding Forces and Simple Machines

What is force?

• A type of energy

• A push or pull on an object

• The speed of an object

• A machine that makes work easier

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Which of the following is an example of friction at work?

• A person slipping on ice

• A car stopping when the brakes are applied

• A ball rolling forever without slowing down

• A spaceship floating in space

Why does a ball fall to the ground when dropped?

• Friction

• Gravity

• Motion

• A pulley system

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Which of the following is an example of work being done?

• Holding a heavy book but not moving it

• Pushing a car that does not move

• Lifting a box from the floor to a shelf

• Sitting in a chair

A pulley is a simple machine that…

• Uses a wheel and rope to lift an object

• Stops objects from moving

• Makes objects heavier

• Is used only for decoration

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How does an inclined plane make work easier?

• It reduces the amount of force needed to lift an object

• It makes objects lighter

• It stops friction

• It moves objects on its own

Which part of a lever does the movement take place around?

• Load

• Effort

• Fulcrum

• Wedge

A wedge is most useful for which task?

• Holding two things together

• Splitting or cutting objects apart

• Rolling objects easily

• Moving a box up a ramp

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Which of the following best describes a force?

• A change in an object’s position

• A push or pull on an object

• An object’s weight

• A tool used to measure motion

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What is an example of a collision?

• A person walking up a ramp

• A car bumping into another car

• A pulley lifting a weight

• A screw holding two pieces of wood together

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