Types of Forces

Answer the following question.

Among the four fundamental forces, only one force governs your daily life almost entirely. Justify the statement by stating that force.

Find the odd man out:

Answer the following question.

You are sitting next to your friend on ground. Is there any gravitational force of attraction between you two? If so, why are you not coming together naturally? Is any force other than the gravitational force of the earth coming in the picture?

Answer the following question.

Distinguish between conservative and nonconservative forces.

Answer the following question.

State the formula for calculating work done by a force. Are there any conditions or limitations in using it directly? If so, state those clearly. Is there any mathematical way out for it? Explain.

Solve the following problem.

As I was standing on a weighing machine inside a lift it recorded 50 kg wt. Suddenly for a few seconds, it recorded 45 kg wt. What must have happened during that time? Explain with complete numerical analysis.

Solve the following problem.

Derive the expression for power in terms of F, m, and t.

Solve the following problem.

Power is the rate of doing work or the rate at which energy is supplied to the system. A constant force F is applied to a body of mass m. Power delivered by the force at time t from the start is proportional to ______.

Derive the expression for power in terms of F, m, and t.