Chapter 6
WORK, ENERGYAND POWER
1. Which of the following is a non conservative force
a. Viscous force
b. Gravitation force
c. Electric force
d. Nuclear force
Ans:- viscous force
2. The Newton's metr is the unit of
Ans:- work
3. The work done by Earth's gravitational force in keeping the moon in its circular orbit is an
Ans:- zero
4. What is the unit of energy
Ans:- kWh
5. A bullet of mass m is fried with a velocity v into a block of wood of mass M initially at rest The velocity after collision is
Ans:- m/m+M ×v
6. During elastic collision between two bodies kinetic energy alone is conserved . State whether this statement true or False
Ans:- False, during elastic collision between two bodies both momentum and kinetic energy are conserved
7. When conservative force does positive work on abody .the potential energy of the body
Ans:- decreases
8. Two masses of 2g and 8 g are moving with equal kinetic energy .The ratio of their momenta is
Ans:- 1: 2
9. The work done by the conservatives force is negative then the potential energy of the body decreases . State whether statement is true or False
Ans:- False. The potential energy of the body increases
10. Energy is lost due to friction force , is the statement currect in terms of physics. Explain?
Ans:- No energy is never lost but get converted into other forms
11. State the law of conservation energy
Ans:- Energy can nighter be created nor be destroyed . It can be converted into one form to another
12. State the true or False " a block is sliding down an inclined plan work done by functional force is zero
Ans:- False, A block is sliding down on inclined plane work done by the frictional force is negative because force and displacement are opposite direction
13. Difine elastic collision
Ans:- initial kinetic energy is equal to the final kinetic energy .The collision in which both kinetic energy and linear momentum of the colliding bodies remain conserved is called elastic collision
14. What is the unit of spring constant
Ans:- Nm -1
15. Spring force is conservative force. Explain?
Ans:- work done depends only an initial and final positions work done is zero.
WORK, ENERGYAND POWER
1. Which of the following is a non conservative force
a. Viscous force
b. Gravitation force
c. Electric force
d. Nuclear force
Ans:- viscous force
2. The Newton's metr is the unit of
Ans:- work
3. The work done by Earth's gravitational force in keeping the moon in its circular orbit is an
Ans:- zero
4. What is the unit of energy
Ans:- kWh
5. A bullet of mass m is fried with a velocity v into a block of wood of mass M initially at rest The velocity after collision is
Ans:- m/m+M ×v
6. During elastic collision between two bodies kinetic energy alone is conserved . State whether this statement true or False
Ans:- False, during elastic collision between two bodies both momentum and kinetic energy are conserved
7. When conservative force does positive work on abody .the potential energy of the body
Ans:- decreases
8. Two masses of 2g and 8 g are moving with equal kinetic energy .The ratio of their momenta is
Ans:- 1: 2
9. The work done by the conservatives force is negative then the potential energy of the body decreases . State whether statement is true or False
Ans:- False. The potential energy of the body increases
10. Energy is lost due to friction force , is the statement currect in terms of physics. Explain?
Ans:- No energy is never lost but get converted into other forms
11. State the law of conservation energy
Ans:- Energy can nighter be created nor be destroyed . It can be converted into one form to another
12. State the true or False " a block is sliding down an inclined plan work done by functional force is zero
Ans:- False, A block is sliding down on inclined plane work done by the frictional force is negative because force and displacement are opposite direction
13. Difine elastic collision
Ans:- initial kinetic energy is equal to the final kinetic energy .The collision in which both kinetic energy and linear momentum of the colliding bodies remain conserved is called elastic collision
14. What is the unit of spring constant
Ans:- Nm -1
15. Spring force is conservative force. Explain?
Ans:- work done depends only an initial and final positions work done is zero.
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