Force, Work, En...

What is the nature of graph of potential energy of a simple pendulum and its displacement from the mean position?

What is the value of gravitation potential energy of the body of mass 2 kg, which is projected vertically upwards with a speed of 3 m/s?

If we throw a body upwards with velocity of 4 ms^-1, at what height does its kinetic energy reduce to half of its initial value?

If the mass of the body is halved and its speed is doubled, what happens to the kinetic energy of the body?

Which of the following statements are correct for frictional force?
(a) A frictional force acts in the direction of the motion of the object.
(b) Frictional force is a kind of contact force.
(c) It acts in opposite direction of the motion and parallel to the surface in contact.
(d) Frictional force is always a curse in the nature.

If a car with a mass of 1000 kg attains an acceleration of 5 m/s² in 5 seconds after the start, what will be the magnitude of its momentum?

If a ball of 20 gm was brought to rest after covering a distance of 50 m moving at a speed of 50 m/s, what was the magnitude of this applied force?

Which of the following statements are correct?
(a) A force produces acceleration in the body on which it acts.
(b) A force can change the shape and size of an object.
(c) A force can change the total mass of an object.     
(d) The S.I unit of force is Dyne.

How many dynes are there in force of magnitude 120 N?