M0.1

Question 1

The mechanical advantage of a screw jack can be increased
by increasing ___________.

Answer 1

The length of a lever

Question 2

The differential chain hoist consists of two concentric pulleys
rigidly fastened together. The pulleys form two sprockets for
an endless chain looped over them in two loops. In one loop
is mounted a movable pulley supporting a load w. Neglecting
friction, determine the maximum load w that can be raised
by a an effort force F.

Answer 2

w = FD/(R-r)

Question 3

If a pulley system can lift 80 N load with an effort force of 8
N and has an efficiency of almost 100 percent, how many
ropes are supporting the load?

Answer 3

1 rope

Question 4

In a compound lever, the leverages of all the simple levers
are:

Answer 4

Multiplied

Question 5

A wooden wedge is pushed horizontally to raise a heavy
object. All surfaces are frictionless. Apply the law of
conservation of energy to determine the mechanical
advantage in terms of the wedge angle θ.

Answer 5

Cot θ