The distance between two consecutive threads of a screw is called _____________.
pitch
couple
gear
torque
What is the efficiency of a machine that requires 100J input energy to do 35J of work?
2.9%
35%
29%
65%
A _____________ is a pair of equal, unlike, parallel, forces which acting on a rigid body at different points produce a turning effect in the same direction.
moment of force
gears
Calculate the effort required to raise a 100kg anchor on to a boat with a wheel and axle of radii 50cm and 10cm respectively.
196N
20N
250N
4900N
The mechanical advantage for a pulley system is determined by ________________.
counting the number of strands holding the resistance force.
counting the number of strands holding and not holding the resistance force.
adding the radii of pulleys.
multiplying the radii of the pulleys.
When a person opens a door, he applies
Force
Torque
Moment
None of the above
If the mechanical advantage of a simple machine is 4, then the
output is 4 times the effort
effort is 4 times the the output force
efficiency is 4%
the work output is 4 times the input
The mechanical advantage of an oar is 3.00. If the resistance force of the water is 35.0N,what is the effort force exerted by the rower?
11.7N
0.0857N
105N
32.0N
The mechanical advantage of a compound machine is determined by __________________.
adding the mechanical advantage for each simple machine
finding the simple machine with the largest mechanical advantage
finding the average mechanical advantage for the simple machines
multiplying the mechanical advantage for each simple machine
A screw driver can be used to open a can of paint. In this situation, the screw driver is being used as a _____________________.
wheel and axle
screw
lever
inclined plane
