Question

Which of the following is/are characteristics of an efficient machine?

• A. In lifting heavy load by using less effort.
• B. Loss in speed.
• C. Changing the direction of effort.
• D. Both A and C

Answer 1

Answer: (A), (C)

The correct options are
A

In lifting heavy load by using less effort.

C

Changing the direction of 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 using less effort.
4. For obtaining a gain in speed.