Understanding Forces and Machines

What is a force?

• A type of energy

• A push or pull that can cause an object to move, stop, or change direction

• A machine that helps lift heavy objects

• The speed of an object

Which of the following is an example of a pull force?

• Kicking a soccer ball

• Pushing a shopping cart

• Opening a door

• Pulling a sled

What is a mechanical device?

• A type of force

• A tool or machine that uses forces to perform work

• A type of energy

• A natural phenomenon

Which of these is NOT an example of a mechanical device?

• Toy car

• Gear

• Sunlight

• Pulley

How does a lever work?

• It rotates to transfer motion

• It uses electricity to lift objects

• It pivots on a point (fulcrum) to lift objects with less effort

• It creates energy from nothing

What is the main purpose of a pulley?

• To create electricity

• To help lift heavy objects

• To measure temperature

• To change the color of objects

When you push a toy car forward, what type of force are you applying?

• Pull force

• Push force

• Magnetic force

• Gravitational force

Which of these actions involves both push and pull forces?

• Opening and closing a drawer

• Dropping a ball

• Watching TV

• Sitting in a chair

How do gears typically work?

• They float in water

• They rotate and transfer motion when force is applied

• They create light

• They measure weight

Which simple machine is described as "a bar that pivots on a point to lift objects with less effort"?

• Pulley

• Gear

• Lever

• Wheel and axle