Tag: force and its effects

Questions Related to force and its effects

 what is the difference in the masses of the pieces,$m _1=20.17 g $ ,$m _2=20.15 g?$(upto two decimal places)

physics along with motion what forces can do? force and it's unit force and its effects

  1. $0.02 g$

  2. $0.021 g$

  3. $0.022 g$

  4. $0.024 g$

Show answer
Correct Option: A
Explanation:

Difference in masses
= $m _2 - m _1$ = $20.17 g -20.15 g$
$=0.02 g$ (correct upto two places of decimal)

For a surface molecule,

physics along with motion what forces can do? force and it's unit force and its effects

  1. the net force on it is non zero

  2. the net force on it zero

  3. there is net downward force

  4. there is net upward force

Show answer
Correct Option: C
Explanation:

A surface molecule experiences a net downward force.

An iron block of sides $50 cm\times 8 cm\times 15 cm$ has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is

physics along with motion what forces can do? force and it's unit force and its effects

  1. $8 cm\times 15 cm $surface

  2. $50 cm\times 15 cm $surface

  3. $8 cm\times 50 cm $surface

  4. Force is same for all surfaces.

Show answer
Correct Option: D
Explanation:

Force will be same for all the surfaces.
Hence, the correct option is $(D)$

Fill in the blanks:

The force responsible for changing the state of motion of a moving object in contact between surface is the _______.

physics along with motion what forces can do? force and it's unit force and its effects

  1. non-contact force

  2. force of friction

  3. magnetic force

  4. muscular force

Show answer
Correct Option: B
Explanation:

The friction force is the force exerted by a surface an object moving across it. It acts in a direction to oppose the relative motion between objects.

Fill in the blanks:

The________ force is the force exerted by a surface on an object when it moves across it or make an effort to move across it.

physics along with motion what forces can do? force and it's unit force and its effects

  1. magnetic

  2. friction

  3. gravitational

  4. electrostatic

Show answer
Correct Option: B
Explanation:

Frictional force acts between two surfaces to oppose the relative motion between the surfaces. It acts on the body moving across it or trying to move across it.

Fill in the blanks:
The force of friction arises due to contact between surfaces. It is an example of _________ force

physics along with motion what forces can do? force and it's unit force and its effects

  1. non-contact force

  2. muscular force

  3. contact force

  4. gravitational force

Show answer
Correct Option: C
Explanation:

Friction is a force that is exerted by a surface on an object that is moving on the surface. So, it is a contact force.

Why does a boat, in still water, come to rest if we stop rowing it?

physics along with motion what forces can do? force and it's unit force and its effects

  1. Due to non-contact force

  2. Due to force of friction

  3. Due to muscular force

  4. Due to magnetic force

Show answer
Correct Option: B
Explanation:

It is the force of friction between the surface of water and the boat that brings the boat to rest once we stop rowing.

What brings the rolling ball to rest?

physics along with motion what forces can do? force and it's unit force and its effects

  1. Force of friction

  2. Gravitational force

  3. Electrostatic force

  4. Magnetic force

Show answer
Correct Option: A
Explanation:

It is the force of friction between the surface of the ball and the ground that bring the rolling ball to rest.

Which of the following cases represent that a force can change the shape of an object?

physics along with motion what forces can do? force and it's unit force and its effects

  1. A man trying to stop a sliding car.

  2. A weight put at the centre of a metal scale placed between two bricks.

  3. Two girls pulling each other.

  4. A man pulling a cow with a rope around his neck.

Show answer
Correct Option: B
Explanation:

A weight put at the center of a metal scale placed between two bricks will bend the scale from the middle.

A spring is compressed when a force is applied. This is an example of

physics along with motion what forces can do? force and it's unit force and its effects

  1. force changing the shape of an object

  2. force changing the motion of an object

  3. force breaking a rigid object

  4. none of these

Show answer
Correct Option: A
Explanation:

A spring gets compressed by the application of a force. This is an example of force changing the shape of an object.