Simple machines: types and examples
Answer in short.
1. Give an example of a situation where work done is zero.
2. Give two uses of an inclined plane.
3. Give some examples where pulley is used as a simple machine
4. What is the lead of a screw?
5. Why do we use a wedge?
6. Define input energy and output energy.
ENGTH
Answers
Explanation:
1) A simple example of zero work is when you stand holding a bag in your hands and do not move it. Your hands apply a force on the bag to balance the force of gravity exerted on it but since there is no displacement of the bag, the work done on it by you (your force) and also the gravity is zero.
2) Inclined planes are widely used to move heavy loads over vertical obstacles; examples vary from a ramp used to load goods into a truck, to a person walking up a pedestrian ramp, to an automobile or railroad train climbing a grade. ... The screw consists of a narrow inclined plane wrapped around a cylinder.
3)Blinds on windows operate using a pulley system to move the blinds up and down. You pull the cord on the blinds and the pulley system causes the blinds to open or close. Flagpoles use pulleys in order to hoist the flag up or to bring it down. You pull the string on the pulley and the flag runs up or down the pole.
4)Lead is the axial advance of a helix or screw during one complete turn (360°) The lead for a screw thread is the axial travel for a single revolution. Pitch is defined as the axial distance between adjacent threads on a helix or screw.
5)Wedges are used to lift heavy objects, separating them from the surface upon which they rest. ... They can also be used to separate objects, such as blocks of cut stone.
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