Physics · Science General

Newtonian Mechanics and Forces

1,605 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

Other than changing the state of motion of an object, force

  1. can change the shape of an object

  2. has no other effect

  3. can change the colour of an object

  4. can change the state of rest of an object
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Effects of force on an object are
(i) to change the state of motion of the object
(ii) to change the shape and size of the object

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

Mark the incorrect statement(s)

  1. Length of a rubber band increases,when a stretching force is applied

  2. A spring shortens in length on the application of a compressive force

  3. Gold on hammering flattens to form a thin leaf

  4. None of above

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

Force can also bring change in dimensions and all the above options are its examples.

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

Mark the correct option

  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

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

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.