Machines and Mechanisms - Grade 4

What is a gear?

• A gear is a wheel with a groove on its edge.

• A gear is a wheel with teeth on its edge.

• A gear is a heart-shaped wheel.

• All of the above

Which of the following is an example of a can opener?

• Pulley

• Gear

What is a window blind an example of?

• Pulley

• Gear

What is this a picture of?

• Fixed pulley

• Movable pulley

There are many...in a clock.

• Pulley

• Gear

An elevator includes the following:

• Gear

• Pulley

• Both gear and pulley

What is it called when two or more gears work together?

• Gear machine

• Gear trolley

• Gear system

• Gear train

What type of gear is this?

• Spur gear

• Bevel gear

• Worm gear

• Gear train

In which direction does the output gear (green gear) rotate?

• Clockwise

• Counterclockwise

Which direction is the input gear (red gear) rotating?

• Clockwise

• Counterclockwise