Simple Machines

Mechanical advantage of a machine is

• Load/ Effort

• Effort/Load

• Effort- load

• Load x effort

Mhanical advantage of single movable fixed Pulley is

• 1

• 2

• 3

• 4

A woman draws water from a well using fixed pulley. The mass of the bucket and water together is 6 kg. The force applied by the woman is 67 N. The mechanical advantage will be

• 1.85

• 1.12

• 0.857

• 2.16

A pulley system has three pulleys. A load of 240 N is overcome by applying an effort of 100 N. Calculate the MA of the system.

• 2.4

• 2

• 4.2

• none.

A pulley system has three pulleys. A load of 240 N is overcome by applying an effort of 100 N. Calculate the efficiency of the system.

• 84 %

• 90 %

• 86 %

• 80%

Name the machine used to change the direction of the effort?

• Fixed pulley

• Movable pulley

• both

• none.

A single movable is preferred over single fixed pulley, because

• 4

• 3

• 2

• 1

Movable pulley is used as a ___

• Speed multiplier

• Force multiplier

• Energy multiplier

• none.

When a machine used as a force multiplier?

• Effort = Load

• effort > load

• effort < load

• none

The relationship between MA, VR of an ideal machine is

• MA= VR

• MA < VR

• MA > VR

• none.