Tag: physics

Questions Related to physics

You can increase the amount of force applied on a body by repeatedly:

physics force and types of force introduction to force what is force? concept of force and its unit

  1. pushing it

  2. pulling it

  3. dragging it

  4. any or all of the above

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Correct Option: D
Explanation:

By repeatedly pushing, pulling or dragging a body, we can increase the amount of force applied on that body. Hence option D is correct.

A force cannot be seen but the effect of force can be felt.

physics force and types of force introduction to force what is force? concept of force and its unit

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

Show answer
Correct Option: A
Explanation:

According to Newton's first law, force is the rate of change of momentum.
Therefore, a force is not a physical object that can be seen. However, the effect of a force on an object can be seen (i.e its changing momentum)

Which of the following class of forces is different from others?

physics force and types of force introduction to force what is force? concept of force and its unit

  1. Pulling of a cart

  2. Stretching of a coiled spring

  3. Kicking of a football

  4. Weight of the body

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Correct Option: D
Explanation:

Pulling of a cart, stretching of a coiled spring and kicking of a ball take place due to contact forces but weight of the body (gravitational force) is a non-contact force.

Hence option D is correct.

1 dyne is equal to

physics force and types of force introduction to force what is force? concept of force and its unit

  1. 980 g wt

  2. $\displaystyle\ \frac { 1 }{ 980 } \ gwt$

  3. 980 kg wt

  4. None of these

Show answer
Correct Option: B
Explanation:

The weight of mass of 1 gram of body is

$ w = mg$
$ w = 1 gm \times980 cm/s^2= 980\  dyne $
So, $ 1\ dyne = \dfrac {1}{980} gwt $
gwt is weight equivalnet in grams.
$ Always\, g wt \times \, g = dyne$

Identify the action involved when a north pole of magnet brought near another north pole of magnet it repels? 

physics force and types of force introduction to force what is force? concept of force and its unit

  1. Pushing

  2. Throwing

  3. Pulling

  4. Lifting

Show answer
Correct Option: A
Explanation:

When similar poles of magnets are brought near each other, they tend to repel i.e they push each other away.

Identify the type of force involved when loaded cart is moved.

physics force and types of force introduction to force what is force? concept of force and its unit

  1. Lifting

  2. Pulling

  3. Running

  4. Reading

Show answer
Correct Option: B
Explanation:

To move a loaded cart we have to pull it . Hence action involved is as pulling.

Which of the following actions can be grouped as push?

a. A cricket ball hit by a batsman.
b. A football player kicking the ball.
c. A girl is shutting the open door of a refrigerator. 

physics force and types of force introduction to force what is force? concept of force and its unit

  1. Only a

  2. Only a and b

  3. only b and c

  4. a, b and c

Show answer
Correct Option: D
Explanation:

All the above examples can be grouped as push. As force is applied to move object away from the body.

Identify the action that can cause motion of a book placed on a table.

physics force and types of force introduction to force what is force? concept of force and its unit

  1. Pulling

  2. Pushing

  3. Lifting

  4. All of the above

Show answer
Correct Option: D
Explanation:

The action involved in moving a book placed on a table can be pulling, pushing or lifting for which force is required.

Which of the following actions can be grouped as pull:

a. Moving a loaded cart
b. Applying brakes while driving car
c. Drawing a bucket of water from a well

physics force and types of force introduction to force what is force? concept of force and its unit

  1. Only a

  2. a and b

  3. b and c

  4. a and c

Show answer
Correct Option: D
Explanation:

For moving a loaded cart  and drawing a bucket of water from a well, the action involved is pulling hence can be grouped as Pull.

Fill in the blanks:

An interaction of one object with another object results in a _________ between the two objects.

physics force and types of force introduction to force what is force? concept of force and its unit

  1. pressure

  2. attraction

  3. force

  4. repulsion

Show answer
Correct Option: C
Explanation:

When one object interacts with another object they exert force on each other, either towards or away from each other.