Question

Answer the following questions.
Is there a difference between ‘applying a force' and doing work? Give reason
for your answer.
Explain, by giving an example, that a moving object can do work.
V. A porter keeps standing at a place while holding a suitcase of mass 20 kg
over his head for five minutes. Has he done some work? Give reason for
your answer.
Define the term 'energy'. Describe an activity to show the inter-relationship
between work and energy,
*
Name a device which converts -
(a) electrical energy into light energy.
(b) sound energy into electrical energy,
(c) chemical energy into electrical energy.​

Answer 1

Answer:

1. Applying force means a push or a pull which produces or tend to produce motion, stops or tends to stop motion. Doing work means when certain force is applied on an object and the object tends to move in the direction of the applied force, the work is said to be done.

2. When force is applied on an object it results in movement of that object and the work is done. ... eg: Suppose a vehicle starts moving, when it moves it travel some distance and the force is applied on it. In this way, work is done on moving vehicle.

3. Here, no work is done by the porter because the angle between force and Displacement is 0° .

4. Energy is the capacity for doing work. Example : To move an object energy should be transferred to the object. Work : The amount of force acting on the body to displace it in the direction of force. Example: Moving a book on the table. Relationship between work and energy.

5. i. An electric bulb is a device , which can convert electrical energy into light energy.

ii. A microphone is an example of a transducer. It is a device that converts the energy from one form to another. Sound energy occurs as shapes of air pressure; the microphone changes this energy into the form of electric current.

iii. A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit.

Explanation:

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Answer 2

Answer:

Applying force means a push or a pull which produces or tend to produce motion, stops or tends to stop motion. Doing work means when certain force is applied on an object and the object tends to move in the direction of the applied force, the work is said to be done.

When force is applied on an object it results in movement of that object and the work is done. ... eg: Suppose a vehicle starts moving, when it moves it travel some distance and the force is applied on it. In this way, work is done on moving vehicle.

Here, no work is done by the porter because the angle between force and Displacement is 0° .

One's ability to do work is called energy and work is the transference of that energy. ... E.g.: Lifting pile of books from the table can be an example of work, as we use energy to lift them up. The energy inside the body is transferred to the pile of books.

a. electric bulb

b. microphone

c. A cell or battery

Explanation:

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