Question

By using a lever, a load of 1000N is lifted by an effort of 400N. If the load arm and effort arm are 8 cm and 24 cm respectively, calculate MA,VR and efficiency.

​

Answer 1

To calculate the mechanical advantage (MA), velocity ratio (VR), and efficiency of the lever system, we can use the following formulas:

1. Mechanical Advantage (MA):

MA = Load / Effort

2. Velocity Ratio (VR):

VR = Load Arm / Effort Arm

3. Efficiency:

Efficiency = (MA / VR) * 100

Given:

Load (L) = 1000 N

Effort (E) = 400 N

Load Arm (LA) = 8 cm = 0.08 m

Effort Arm (EA) = 24 cm = 0.24 m

Now, let's calculate the values:

1. Mechanical Advantage (MA):

MA = Load / Effort = 1000 N / 400 N = 2.5

2. Velocity Ratio (VR):

VR = Load Arm / Effort Arm = 0.08 m / 0.24 m = 0.3333

3. Efficiency:

Efficiency = (MA / VR) * 100 = (2.5 / 0.3333) * 100 = 750%

The mechanical advantage is 2.5, the velocity ratio is 0.3333, and the efficiency is 750%.