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
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.

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

An object is subjected to a non-zero net force, $F$. Which of the following statements about its motion could not be true?

  1. The object will remain at rest

  2. The object has a constant velocity

  3. The object is travelling in a straight-line path with a constant speed

  4. The object is travelling in a circular path with a constant speed

  5. The acceleration of the object is perpendicular to the net force
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Net force on an object is directly proportional to the acceleration of the particle which is the rate of change of velocity.

When a body moves in a uniform circular motion, its velocity keep on changing though its speed is constant.

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

Which of the statements about force are true?

  1. It can be seen

  2. It causes an object to move

  3. It is pull or a push

  4. It can change the motion of an object
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation

The force can net be seen but we can see the effects of the force. The force is a pull or a push. The effect of forces are like as it causes an object to move, it can change the motion of the body, it can change shape or volume of the body. 

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

Force is an external effect in the form of a push or pull, which ..................

  1. Produces or tries to produce motion in a body at rest

  2. Stops or tries to stop a moving body

  3. Changes or tries to change the direction of motion of the body

  4. None of these
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

When force is applied in the direction of motion it increases velocity,

when applied opposite to the direction of motion it will try to reduce the velocity.
when force is applied at any angle with velocity of object, it will try to give a component in that direction where force is applied hence direction or magnitude of net velocity is changed.
When force is applied to any body, an acceleration is generated in that direction where force is applied.

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

You are on a frictionless horizontal plane. How can you get off if no horizontal force is exerted by pushing against the surface?

  1. By jumping

  2. By splitting or sneezing

  3. By rolling your body on the surface

  4. By running on the plane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

While splitting or sneezing you will exhale things out with some momentum by applying force on it and in return you will experience a force in the opposite direction according to the $Newton's\quad Third\quad Law\quad of\quad Motion$.So, in this way you will aquire a velocity on a frictionless surface and you will be able to get off it.

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

A rider on horse falls back when horse starts running all of a sudden because

  1. Rider is taken back

  2. Rider is suddenly afraid of falling

  3. Inertia of rest keeps the upper part of body at rest while lower part of the body moves forward with the horse.

  4. Inertia of motion keeps the upper part of body at rest while lower part of the body moves forward with the horse.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A rider on horse falls back when horse starts running, all of a sudden because the rider is in state of rest initially and later inertia of rest keeps the upper part of body at rest while lower part of the body moves forward with horse.

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

If a body is moving with a constant speed along a straight line; then in order to change its direction of motion, an external force has to be applied in a direction normal to the direction of motion.

  1. True

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

Newton's First law of motion - "Every body continues to be in its state of rest or of uniform motion in a straight line unless compelled by some external force to act otherwise". 

According to Newton's First law of motion, statement is true, an external force has to be applied in a direction normal to the direction of motion to change its direction of motion