EEI TECH EEI Tech Mechanical Concept 4

Question 1

In a block and tackle with 4 supporting rope segments, how much effort is needed to lift a 400 lb load (ignoring friction)?

Accepted Answer

100 lb

Answer

The load is shared by 4 rope segments: 400/4 = 100 lb of effort.

Question 2

Two objects of equal mass fall in a vacuum, one heavier-looking than the other. Which hits the ground first?

Accepted Answer

They land at the same time

Answer

In a vacuum all objects accelerate at the same rate regardless of mass.

Question 3

A wedge is best described as which combination?

Accepted Answer

Two inclined planes joined back to back

Answer

A wedge is two inclined planes joined to convert downward force into sideways splitting force.

Question 4

If the diameter of a driving pulley is twice that of the driven pulley, the driven pulley will turn:

Accepted Answer

Twice as fast

Answer

A smaller driven pulley spins faster; half the diameter means double the speed.

Question 5

What happens to the pressure exerted by a force when the area it acts on is reduced?

Accepted Answer

Pressure increases

Answer

Pressure equals force divided by area, so a smaller area means greater pressure.

EEI TECH Test Practice Test