Tag: physics

Questions Related to physics

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

  1. The state of motion of an object is described by its speed only

  2. Many a time application of force does not result in a change in the state of motion of an object.

  3. By sitting on a bicycle seat force is applies to the spring fixed to the seat of a bicycle

  4. All of the above 

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Correct Option: D
Explanation:

It is common experience that many a time application of force does not result in a change in the state of motion.For example,a heavy box may not move at all even if you apply the maximum force that you can exert.

Mass differs from weight in that :

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

  1. Weight is a force where as mass is not a force.

  2. The mass of an object is always more than its weight.

  3. Mass can be expressed only in the metric system.

  4. There is no difference.

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Correct Option: A
Explanation:

Weight is gravitational force acting on body.

Mass is amount of matter the body contains.
Relation between weight and mass is
$ w = mg$
So, Option A is correct.

Swimming is possible on account of :-

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

  1. First law of motion

  2. Second law of motion

  3. Third law of motion

  4. Newton's law of motion

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Correct Option: C
Explanation:

Swimming is account on the newton's third law of motion since as we push the water we feel equal force by water on us and we move front

Four forces are acting on a body. If the body doesn't change its position or shape, the forces

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

  1. Must be of equal magnitude

  2. Must be parallel & opposite

  3. Must add up to zero when taken as vectors

  4. Must be in a single line and in same direction

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Correct Option: C
Explanation:

Body does not move even if forces are applied, that means body is in equilibrium.

$ \sum \vec F = \vec 0 $
So, option C is correct.

When you and your friend push a table in opposite direction, it becomes difficult to move. This is because the net force becomes the difference of the two forces.

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:

Whenever forces act on an object in opposite directions—like the book on the table—the net force is equal to the difference between the two forces. In other words, one force is subtracted from the other to calculate the net force. If the opposing forces are equal, or balanced, the net force is zero, as it is for the book.

Hence, the net force becomes the differences of the two forces.

Make the correct statement (s)

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

  1. Force in the same direction by addition.

  2. Force in opposite direction by subtraction

  3. Force in same direction by subtracting

  4. Force in opposite direction by addition

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Correct Option: A,B
Explanation:

If two forces act on an object in the same direction, the net force is equal to the sum of the two forces. This always results in a stronger force than either of the individual forces alone.

Whenever forces act on an object in opposite directions—like the book on the table—the net force is equal to the difference between the two forces. In other words, one force is subtracted from the other to calculate the net force. If the opposing forces are equal, or balanced, the net force is zero, as it is for the book.

Hence, force in the same direction by addition and force in opposite direction by subtraction

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.