Blacksmiths fixes metal rims on wooden wheel. The metal rim is slightly smaller thant the wooden wheel. Why?

1.) Direction

2.) Easier

3.) Seconds

Explanation:

1.) Work is defined as the scalar product of force and distance. The force is applied in the same direction as that of distance.

Mathematically,

2.) From the above expression, the angle plays an important role in the calculation of work.

When , then and work done will be maximum in that case.

But, when the angle increases, the magnitude of work decreases and it becomes easier to push.

When , then and work done will be 0 which is minimum.

3.) Expression for power is given as:

Units of time which must be used in calculating power is seconds.