Physics · Science General

Newtonian Mechanics and Forces

1,559 Questions

Newtonian mechanics studies the motion of objects and the physical laws governing them. This hub covers friction, gravitational force, inertia, and vector quantities. Mastering these fundamental physics concepts is essential for various government competitive exams.

Laws of motionFriction and inertiaVector and scalar quantitiesGravitational accelerationArchimedes principle

Newtonian Mechanics and Forces Questions

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

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

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

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

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.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Make the correct statement (s)

  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
Reveal answer Fill a bubble to check yourself
A,B Correct answer
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

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

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

  1. Shape

  2. Size

  3. elasticity

  4. reactivity with water
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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.