Tag: physics

Questions Related to physics

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.

If the the magnitude of the applied force changes while maintaining its direction, then choose the correct statement.

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

  1. Effect of force remain the same.

  2. Effect of force changes.

  3. Effect of force may or may not change.

  4. Insufficient information

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Correct Option: C

The application of a force would result in a change in the state of motion of an compressible object. The given statement is:

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

  1. always true.

  2. not always true.

  3. always false.

  4. insufficient information

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Correct Option: B
Explanation:

Many a times, application of force does not result in a change in the state of motion. For example, no effect of force in the state of motion is observed when you try to push a wall.

What is the direction of force of friction acting on a body moving on a fixed surface?

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

  1. Along the direction of motion

  2. Opposite to the direction of motion

  3. It has no direction

  4. At an angle to the direction of motion

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Correct Option: B
Explanation:

The force of friction acts on moving objects and its direction is opposite to the direction of motion.

When a force is applied on a non-rigid object,

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

  1. its shape changes

  2. its shape remains same

  3. only its state of motion changes

  4. nothing happens

Show answer
Correct Option: A
Explanation:

Force changes the shape of a non-rigid body.