QUIZ 3: WHEEL AND AXLE, PULLEYS AND GEARS Flashcards
A wheel and axle multiplies the input force and distance.
False
An ideal single movable pulley requires an input force that is one-half the output force.
True
Each supporting strand of a block and tackle increases the input force by one-half.
False
A single fixed pulley changes the effort force in direction.
True
The IMA of the wheel can be increased by increasing the size of the wheel.
True
The IMA of the wheel can be increased by decreasing the size of the axle.
True
The IMA of a pulley can be found by counting the strands supporting the ____.
Output
One of the oldest methods of transmitting motion is the use of ____.
Gears
AMA is found by dividing output force by ____.
Effort force
The IMA of the wheel and axle can be found by dividing the radius of the wheel by the radius of the ____.
axle
Complete the sentence. A wheel with a radius of 18 centimeters has an axle with a radius of 3 centimeters. The IMA of this system is ____.
6
A block and tackle is used to lift an automobile engine that weighs 1800 N. The person exerts a force of 300 N to lift the engine. How many ropes are supporting the engine?
6
In a pulley system, a 5-newton weight is to be lifted 2 meters. The rope is pulled 10 meters. The input force is two newtons. The IMA = ____, The AMA = ____, The efficiency = ____%.
5, 2.5, 50
When using a wheel and axle system, if the input force is applied to the wheel, the input force moves through a greater distance than the output force.
True
Is there any mechanical advantage in using a single fixed pulley?
no
In a real system of levers, wheels or pulleys, AMA < IMA because of ____.
friction
