$(a)$ Define one watt.
$(b)$ $A$ lamp consumes $1000 \ J$ of electrical energy in $10 \ s$. What is its power?

Is it possible that an object is in a state of accelerated motion due to an external force acting on it,but no work is being done by the force? Explain with an example.

Define potential energy. Write an expression for potential energy. Write the $SI$ unit of potential energy.

Calculate the kinetic energy of a body of mass $2 \, kg$ moving with a velocity of $0.1 \, m s^{-1}$. (in $, J$)

State whether the following statement is true or false:
Work done by a force depends upon how fast work is done.

$(a)$ Name two forms of energy involved while a pendulum oscillates.
$(b)$ Show with the help of a diagram that when does each type of energy attain its maximum value.
$(c)$ How do these energies vary while the pendulum oscillates?
$(d)$ Name and state the law involved.