Question

Which of the following ways depicts the usefulness of a machine?

• A. In lifting heavy load by using less effort
• B. Loss in speed
• C. Changing the direction of effort
• D. (a) and (c) above.

Answer 1

The correct option is D (a) and (c) above.

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.