F. Answer the following in short.
1.State the factors responsible for the work done by a body.
2. Define kinetic energy and give an example of a body possessing kinetic energy.
3. State two differences between power and energy.
4. List two situations where no work is done.
5 How can you measure the gravitational potential energy of an object?
6. State the law of conservation of energy.
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Answers
Explanation:
1.(i) Magnitude of force applied (F)
(ii) Distance moved by the body in the direction of force (d).
2.Kinetic energy of a body is the energy possessed by it due to its state of motion. Actually, it is the work done on the body bringing it to the state of motion. In short form, it is written as K.E. or K. Example: In a swinging pendulum moving to and fro, the bob has the kinetic energy.
3.But now you know the difference: energy is the total amount of work done, and power is how fast you can do it. In other words, power is energy per unit of time. Power is watts. Energy is watt-hours.
4. -If a block is moving on a smooth horizontal surface, no work is done.
-You are carrying two bags in your hands and not moving . ...
5.PEgrav = m *• g • h
In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth) - sometimes referred to as the acceleration of gravity.
6.The law of conservation of energy states that in a closed system the total amount of energy is conserved and does not change. This means that energy may change from one form to another, but that the total amount of energy in the closed system remains constant.
So accoding to this statement it is clear that only option D is best possible.
Answer:
The work done on a body depends upon two factors: Magnitude of the force (F), and. The displacement through which the body moves (s)
Kinetic energy of a body is the energy possessed by it due to its state of motion. Actually, it is the work done on the body bringing it to the state of motion. In short form it is written as K.E. or K. Example : In a swinging pendulum moving to and fro, the bob has the kinetic energy
But now you know the difference: energy is the total amount of work done, and power is how fast you can do it. In other words, power is energy per unit of time. Power is watts. Energy is watt-hours.
If a block is moving on a smooth horizontal surface, no work is done.
You are carrying two bags in your hands and not moving . ...
A person holds a bundle of hay over his head for 30 minutes and gets tired. ...If you push a wall , but it does not move . ...You sit on a chair for hours
The equation for gravitational potential energy is GPE = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 on Earth), and h is the height above the ground in meters.
In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. ... For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.