Question

When you are climbing stairs, work done by the weight is positive. (T or F)

• A. True
• B. False

Answer 1

The correct option is B False

1. When we are climbing the stairs, the force applied by us and the displacement are acting upwards.
2. The angle between the force and the displacement is $0°$ as they are in the same direction.
3. Work done is expressed as $W=Force\left(F\right)xDisplacement\left(s\right)x\cos \theta$.
4. Here, $\cos 0°=1$. So the work done by the applied force is positive.
5. Weight is the gravitational force acting on an object. It acts in the downward direction.
6. Here, weight and displacement are in opposite direction. So the angle $\theta =180°$.
7. $\cos 180°=-1$. So the work done by the weight is negative.

Hence, the given statement is false.