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

If we apply the brakes to a moving car, it comes to rest. This shows that force can make a moving object go slower.

  1. True

  2. False

  3. Ambiguous

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

Answer is A.

Friction prevents objects from moving or slows them down. It also causes wear on surfaces as they rub against each other and generates heat. Thus energy is wasted in overcoming friction. Hence, the force of friction can slow down an object.
Hence, the statement is true.

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

State whether true or false.
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 or its component has to act in a direction normal to the direction of motion.

  1. True

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

Here, body is moving with constant velocity. 

To change its direction of motion,  an external force must act in the direction opposite to the velocity, so given statement is false. 

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

In which of the following cases, the net force acting on the body is not zero?

  1. An object floating in mercury

  2. A ball freely falling from a certain height

  3. A cork floating on the surface of water.

  4. All of the above cases.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the case of falling freely under gravity.

  By newton second law
 $F _{net}=ma$
in this case $a=(-g)$
Hence there is net force in downward direction.
Rest are all balanced.

Multiple choice physics force and types of force concept of force and its unit force - push or pull forces

In which direction does a car at rest move when pushed by a few persons?

  1. In the direction opposite to push

  2. In the direction of the push

  3. Making an acute angle with the push

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

To move a car, their must be interactions between the men and the car. The interaction is exerted in terms of push and the car moves in the direction of push, i.e., in the direction of the force applied.

Multiple choice physics force and types of force concept of force and its unit force - push or pull forces

Which of the following is/are contact forces

  1. Normal force

  2. Tension force

  3. Friction force

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Contact forces are those types of forces which result when the two interacting objects are perceived to be physically contacting each other. Examples of contact forces include frictional forces, tensional forces, normal forces, air resistance forces, and applied forces.

Multiple choice physics force concept of force and its unit force - push or pull forces

Fill in the blanks:
The net force is ______ than the individual applied forces.

  1. either larger or smaller

  2. always smaller

  3. always greater

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

The net force is either sum or difference of individual applied forces. So, the force is either larger or smaller than individual forces.

Multiple choice physics force concept of force and its unit force - push or pull forces

A set of unequal and opposite forces is called:

  1. Balanced forces

  2. Unbalanced forces

  3. Equilibrium forces

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Unequal and opposite forces do not cancel out each other completely and thus resulting in net force acting in a particular direction. A set of such forces is called a set of unbalanced forces.

Multiple choice physics force concept of force and its unit force - push or pull forces

A number of forces act on a body at the same point and the body does not move. What do you conclude from this?

  1. Body is acted upon by a set of balanced forces.

  2. Body is acted upon by a set of unbalanced forces.

  3. Body is acted upon by a set of unknown forces.

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Balanced forces cancel out the effect of each other. Thus, no net external force acts on the body and hence a body at rest does not move.

Multiple choice physics force concept of force and its unit force - push or pull forces

If the forces on an object are balanced, then the net force is:

  1. Either positive or negative depending on the strength of forces.

  2. Negative

  3. Positive

  4. Zero
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

If the forces on the object are balanced, this means that the individual force cancel out each other resulting in a zero net force acting on the object.