Tag: force and it's unit

Questions Related to force and it's unit

To move at the same speed, a car with a face and another with streamlined body will require a different amount of force from the engine. the engine of the streamline bodied car will

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

  1. exert less force

  2. exert more force

  3. exert zero force

  4. exert no force

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Correct Option: A
Explanation:

A car with streamline body suffers less air air friction while moving and car with flat face will suffer higher air friction.As a result car with with streamline body will require less force from the engine to maintain the same speed

A bock of mass m moving with u sticks to an identical block at rest The combined mass will be

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

  1. Not move

  2. Move with 2 u

  3. Move with u

  4. Move with u/ 2

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Correct Option: D

Force can only increase or decrease the speed of a moving object or change its direction.

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

  1. True

  2. False

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Correct Option: A
Explanation:

An external force applied can only increase or decrease the speed of a moving object or change its direction.

Which of the following property of a substance cannot be changed by application of force?

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

  1. Shape

  2. Size

  3. elasticity

  4. reactivity with water

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Correct Option: D
Explanation:

Application of force only changes the physical state of the substance but not the chemical state (properties). As reactivity of substance with water is a chemical property, thus it will not be effected due to application of force.

A body can change its state of rest or of uniform motion on its own. True or false.

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

  1. True

  2. False

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Correct Option: B
Explanation:

Newton's first law of motion states that a body can change its state of rest or of uniform motion only when acted upon by some external force

Choose the wrong statement:

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

  1. 1 kg wt = 9.8 N

  2. Momentum is a vector quantity.

  3. Force is always conserved.

  4. Momentum is conserved in the absence of an external force.

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Correct Option: C
Explanation:

$ 1kg-wt = 1 \times 9.8 N $ 

$ momentum = mass \times velocity $ As velocity is vector, momentum is vector.
Friction is non conservative force.
According to Newton's second law, rate of change of momentum is directly proportional to applied force.
So,if force is zero, momentum is conserved.
So wrong statement is option C.

The action of a force on an object imparts:

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

  1. motion.

  2. change in shape.

  3. change in size.

  4. all of these

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Correct Option: D
Explanation:

The action of a force on an objects can result in:

1. Movement of an object.
2. Change in size of an object.
3. Change in shape of an object.

If you push a light object continuously, its speed:

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

  1. will keep on increasing.

  2. will keep on decreasing.

  3. will remain same.

  4. will become zero.

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Correct Option: A
Explanation:

If the force applied on the object is in the direction of its motion, the force aids the motion of the object and hence the speed of the object increases.

Change in state of motion of an object can be described as:

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

  1. change in speed only.

  2. change in direction of motion only.

  3. change in both speed or direction.

  4. change in neither speed nor direction.

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Correct Option: C
Explanation:

A change in either the speed of an object or its direction of motion or both is described as a change in its state of motion.

In pressing a rubber ball placed on a table, the application of force leads to:
physics along with motion what forces can do? force and it's unit force and its effects

  1. a change in the shape of the object.

  2. a change in the state of the motion of the object.

  3. a change in the mass of the object.

  4. no change anywhere.

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Correct Option: A
Explanation:

On pressing a rubber ball placed on a table,the ball compresses and hence, the shape of the ball changes.