Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

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

Choose the wrong statement:

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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

  1. Effect of force remain the same.

  2. Effect of force changes.

  3. Effect of force may or may not change.

  4. Insufficient information
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The effect of a force depends on its magnitude and direction. If the magnitude changes, the net effect (acceleration or deformation) will change, unless the object is in a state where the force is irrelevant.

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

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

  1. always true.

  2. not always true.

  3. always false.

  4. insufficient information
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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