Work is done when a force causes an object to move through a distance. Work transfers energy to or from an object. The magnitude of work done is equal to
... [Show More] the product of the force and the distance moved in the direction of the force. Power is defined as the rate at which work is done or energy is transferred. The SI unit for power is the watt. Common non-SI units include the horsepower. Kinetic energy is the energy an object possesses due to its motion. Potential energy is stored energy due to an object's position or state. The formulas for kinetic and potential energy are discussed.
PHYSICS CHAPTER # 07
Work, Power & Energy
1. Work is said to be done when a body is moved or stopped through certain distance by the action of:
a) Energy b) Force
c) Power d) Momentum
B
2. When work is done _______ is transferred to the body or taken out of the body:
a) Energy b) Force
c) Power d) Momentum
A
3. During The process of doing work energy is transferred to the body or taken out of the body in the form
of:
a) Kinetic energy b) Potential energy
c) Momentum d) Force
A
4. Work is a product of:
a) Power and time b) Energy and displacement
c) Force and energy d) Force and distance
D
5. The magnitude of work done by a force f through a distance d acting at angle is given by:
a) fd sin b) fd tan
c) fd cos d)
7. Work done is maximum when force is _______ to displacement:
a) Equal b) Perpendicular
c) Opposite d) Parallel
D
8. For certain values of F and d, work done is zero when the angle between the force and displacement is:
a) 0o
b) 30o
c) 90o
d) 180o
C
9. The magnitude of work is maximum in the opposite direction when the angle is equal to:
a) 0o
b) 45o
c) 90o
d) 180o
D
10. The units of work are the same as those of:
a) Power b) Energy
c) Force d) Mass
B
11. The force acting on a body in the gravitational field at any point is equal to its:
a) Gravitational mass b) Weight
c) Acceleration d) Inertia
B
12. The work done in a gravitational field is independent of:
a) Its distance b) Its mass
c) Its path d) Its potential energy
C
13. A field is said to be conservative if the work done along a closed path is:
a) Zero b) Negative
c) Positive d) Infinity
A
14. The rate of doing work is called:
a) Energy b) Power
c) Force d) Inertia
B
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