Question

In which of the following ways a machine can be useful?

• A. In lifting heavy load by using less effort.
• B. In lifting heavy load by using more effort.
• C. In lifting lighter load by using more effort.
• D. Machines are not useful at all.

Answer 1

The correct option is A

In lifting heavy load by using less effort.

The four ways in which machines are useful to us are:

1. In changing the point of application of force to a convenient point.
2. In changing the direction of effort to a convenient direction.
3. In lifting heavy load by applying less effort.
4. For obtaining a gain in speed by smaller movement of effort.