Simple Machines

The ability to audio to do work is called ______

Machines helps us to ______

• save effort

• to do work

• save time

• All of them

Some machines are simple and some are ______

• bad

• good

• complex

• costly

The Mechanical advantage of the Lever is equal to

• Load arm/Effort arm

• Effort arm/Load arm

• Load arm+Effort arm

• Load arm - Effort Arm

A pulley is used because it

• has the mechanical advantage greater than 1.

• has 100% efficiency.

• helps to apply the force in a conventional direction.

• requires more efforts to raise a less load.

Wheel is used with axle because

• sliding friction is less than the rolling friction.

• rolling friction is less than sliding friction.

• they work as inclined plane.

• They help us to change the direction of force.

Name the machine to which the following belong?

1. Beam Balance

Name the machine to which the following belong?

Lemon Crusher

Name the machine to which the following belong?

Sugar Tongs

Name the machine to which the following belong?

Ramp