C.
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 most
4. What is the lead of a screw?
5. Why do we use a wedge?
6. Define input energy and output enerey
Answers
Answers :-
1.
Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied. That's because a machine doesn't change the amount of work and work equals force times distance.
2.
A lever amplifies an input force to provide a greater output force, which is said to provide leverage. The ratio of the output force to the input force is the mechanical advantage of the lever. As such, the lever is a mechanical advantage device, trading off force against movement.
3.
We tend to think love occurs solely between romantic partners, but this isn't true. Humans can experience eight types of love in various relationships, such as with romantic partners, friends, family and even strangers on the street.
4.
An inclined plane is a simple machine that consists of a sloping surface connecting a lower elevation to a higher elevation. It is used to move objects more easily to the higher elevation. Less force is needed to move an object uphill with an inclined plane, but the force must be applied over a greater distance.
5.
There are three main types of pulleys: fixed, movable, and compound. A fixed pulley's wheel and axle stay in one place. A good example of a fixed pulley is a flag pole: When you pull down on the rope, the direction of force is redirected by the pulley, and you raise the flag.
6.
The wheel and axle is a machine consisting of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other. It can amplify force; a small force applied to the periphery of the large wheel can move a larger load attached to the axle.
7.
The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent. Some of the force applied to moving the furniture must be used to overcome the friction with the ramp.
8.
Proactive maintenance is the key to anticipating when there will be a problem with the machine (and being able to take action to avoid inconvenient breakdowns or repair costs in the future). To prevent costly issues from happening, it's important to organise routine services on your machine or equipment.