1. Define the following terms: (a) static friction (b) sliding friction (c) rolling friction 2. State three effects of the force of friction. 3. What is an ideal machine? State the principle of an ideal machine. 4. What do you understand by the term machine? Name two types of simple machines.
Answers
Explanation:
1)
a) static friction is the friction that exists between a stationary object and the surface on which it's resting. Once the objects have already started moving, kinetic friction takes over. This is the friction that exists between two objects moving relative to each other.
b) The term sliding friction refers to the resistance created by two objects sliding against each other. This can also be called kinetic friction. Sliding friction is intended to stop an object from moving.
c) Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. ... Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy.
2)
A force can produce the following effects:
- A force can move a stationary object.
- A force can stop a moving object.
- A force can change the speed of a moving object.
- A force can change the direction of a moving object.
- A force can change the shape and size of an object.
3)
The term ideal machine refers to a hypothetical mechanical system in which energy and power are not lost or dissipated through friction, deformation, wear, or other inefficiencies.
According to the principle of machine work done by a machine or output work can never be greater than the work done on the machine or input work. In an ideal machine, “the output work of a machine is equal to input work”, is known as principle of a machine.
4)
A machine (or mechanical device) is a mechanical structure that uses power to apply forces and control movement to perform an intended action.
The two basic families of simple machines are the lever family and the inclined plane family. Within the lever family are the simple lever, the pulley and the wheel and axle.
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Answer:
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Explanation:
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