A block of mass m is pulled over distance d by an applied force F as shown in th

Question

A block of mass m is pulled over distance d by an applied force F as shown in the figure shown below. Mark the correct statement a) work done by the force F is positive and equal to Fd b) work done by the force is negative and equal to Fd c) work done by the force is zero d) work done by the force is positive and equal to mFd e) work done by the force is negative and is equal to mFd Two equal and opposite forces act on object. What happens to the kinetic energy of an object? a) the kinetic energy is zero b) the kinetic energy increases c) the kinetic energy decreases d) the kinetic energy may remain the same e) the kinetic energy may be positive or negative An object I with a mass 6 kg lifted vertically 3 m from the ground level: another object II with a mass of 2 kg is lifted 6 m up. Which of the following statements true I. Object I has greater potential energy since it is heavier II. Object II has greater potential energy since it is lifted to a higher positio

Explanation / Answer

1 a) Work done is positive and equal to Fd

2 a) The kinetic energy is zero because there is no net fporce and hence no motion

3) a) Potentail energy of object i is greater than II because it is heavier

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