Complex Machines and Simple Machines

The video tutorial explains complex machines, which are made up of multiple simple machines. It provides examples such as watches, wheelbarrows, and bicycles, detailing how each uses simple machine components like gears, levers, and pulleys to function. The tutorial highlights the mechanics of these machines, showing how they make tasks easier by reducing effort and increasing efficiency.

What is a complex machine?

• A machine with only one simple component

• A machine that is used only in factories

• A machine made up of multiple simple machines

• A machine that does not require energy

Which of the following is NOT an example of a complex machine?

• Watch

• Hammer

• Wheelbarrow

• Bicycle

In a watch, what simple machines are primarily used?

• Lever and pulley

• Gear and screw

• Inclined plane and wedge

• Wheel and axle

How does the main gear in a watch affect other gears?

• It stops them from moving

• It moves them at the same speed

• It moves them at different speeds

• It reverses their direction

What simple machines are used in a wheelbarrow?

• Lever and wheel and axle

• Pulley and inclined plane

• Gear and lever

• Screw and wedge

What is the primary function of the pulley system in a crane?

• To lower the load

• To make raising the load easier

• To balance the load

• To rotate the load

Which simple machines are found in a bicycle?

• Pulley and lever

• Gear and wheel and axle

• Wedge and gear

• Screw and inclined plane

How does pedaling a bicycle affect its movement?

• It moves the bicycle backward

• It rotates the chain and moves the bicycle forward

• It stops the bicycle

• It only rotates the front wheel

What happens when the large gear in a bicycle rotates?

• The bicycle moves backward

• The bicycle stops

• The small gear rotates multiple times

• The chain becomes loose

How can the speed of a bicycle be changed?

• By using a different sized gear

• By inflating the tires

• By adjusting the seat height

• By changing the color of the bicycle