Mechanical Advantage
1. Investigate and demonstrate mechanical advantage and efficiency of various
machines such as levers, motors, wheels, axles, pulleys and ramps
____
1. Which of the following block and tackle systems has the largest mechanical advantage?
____
System A has the largest mechanical advantage.
System B has the largest mechanical advantage.
System C has the largest mechanical advantage.
All three systems have the same mechanical advantage.
2. The human arm is an example of which class of lever?
a.
b.
c.
d.
a.
b.
c.
d.
First class
Second class
Third class
None of the above
____
3. Which of the following levers has the largest mechanical advantage?
____
Lever A
Lever B
Lever C
All three levers have the same mechanical advantage.
4. The lever in the picture will:
a.
b.
c.
d.
a.
b.
c.
d.
____
stay balanced.
rotate clockwise.
rotate counter-clockwise.
do none of the above.
5. A system of pulleys is used to lift an elevator carrying a 3,300-newton load. Assuming
the pulley system is nearly friction-free, approximately how far would 10,000 joules of
energy lift the elevator?
a.
b.
c.
d.
0.3 meters
3 meters
30 meters
300 meters
____
6. A TV repairman has to make a delivery of an old and very heavy television. Instead of
lifting it up 1.0 meter into his truck, the repairman makes a ramp out of a board 4.0
meters long. He puts the TV on a wheeled platform and pushes it up the board and into
the back of his truck. What is the mechanical advantage of the ramp?
a.
b.
c.
d.
0.25
1
2
4
Answer machines
1.
2.
3.
4.
5.
6.
C
C
A
B
B
D