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 friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

Which of the following is true for friction?

  1. It is necessary to perform many tasks.

  2. It produces heat.

  3. It wears out the surfaces in contact.

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

Friction is important to perform many tasks. It also produces heat in the process and since the two surfaces keep rubbing against each other, they gradually wear out.

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

Friction is _____ in some situations.

  1. desirable

  2. undesirable

  3. both A and B

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Friction is both desirable and undesirable depending on the situation. For example, the tyres of an automobile are grooved to increase friction. However, the ball bearings in the same automobile are regularly oiled to reduce friction and ensure smooth functioning of the engine.

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

The friction between two bodies produces

  1. Motion

  2. Expansion

  3. Heat

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

The friction is a force which occurs between two bodies, when say one of them is at motion/ or at both of them in a motion. The rubbing of hand is an example of friction which causes warm feeling in hands.

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

Which of the below statements prove that friction is disadvantageous?

  1. Tyres of cars wear out

  2. Soles of shoes wear out

  3. Machine parts wear out

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

All of the above is correct answer. As we know friction is useful but in other means it is also disadvantageous or we can say an evil which is a necessity. Whenever there is movement between two parts of machinery or whenever there is contact between shoes sole and rough road, the parts in contact wear out. Friction causes wear and tear of parts as well as heat is produced which damages the parts.

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

Which of the following statements is NOT true?

  1. Friction makes things slow down

  2. Friction produces heat

  3. Friction can stop moving objects

  4. Friction is not useful
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The statement that friction is not useful, is not true. Friction is advantageous in our daily life. Without friction we will not be able to walk properly, nor drive vehicles etc. 

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

Frictional force is important for motor racing. This is because frictional force.

  1. can help a car to slow down

  2. can help a car to move faster

  3. can help a car move around the comers without skidding

  4. none of New
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

Frictional force can help a car to slow down and can help to move around the corners without skidding due to the frictional force between tyres and ground . Without friction , brakes of the car will not work and it will be impossible to control the car , due to this we say friction is a necessary evil .

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

Friction is a that opposite motion?

  1. True

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

Friction force is the force that opposes the relative motion of an object or the direction opposite to the tendency of relative motion due to the contact of 2 rough surfaces. Hence it is exactly opp to the direction of relative motion of the object.

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

Which of the following statements is NOT true for friction force?

  1. Friction force is produced when two objects rub against each other

  2. A lighter object will experience a smaller frictional force

  3. Friction produces more wear and tear

  4. Friction is harmful
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

ADVANTAGES OF FRICTION
Friction plays a vital role in our daily life. Without friction we are handicap.
1. It is becomes difficult to walk on a slippery road due to low friction. When we move on ice, it     becomes difficult to walk due to low friction of ice.
2. We can not fix nail in the wood or wall if there is no friction. It is friction which holds the nail.
3. A horse can not pull a cart unless friction furnishes him a secure Foothold.
DISADVANTAGES OF FRICTION 
Despite the fact that the friction is very important in our daily life, it also has some disadvantages like:
1. The main disadvantage of friction is that it produces heat in various parts of machines. In this way     some useful energy is wasted as heat energy.
2. Due to friction we have to exert more power in machines.
3. It opposes the motion. 
4. Due to friction, noise is also produced in machines.
5. Due to friction, engines of automobiles consume more fuel which is a money loss.
So, Friction is useful for braking moving vehicles; for walking in smooth / slippery surfaces like snow and sand.
Answer (D) friction is harmful

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

You are marooned on a frictionless horizontal surface and cannot exert any horizontal force by pushing against the surface. How can you get off ?

  1. by jumping

  2. by spitting 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

By spitting or sneezing we can get off.

Since there is no friction present we need to spit or sneeze which will produce a suitable friction to get off. Also this will produce a momentum in opposite direction which will help us to move in opposite direcdtion.

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

Friction is a/an

  1. self-adjusting force

  2. necessary evil

  3. important force in daily life

  4. all the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  1. Static friction is considered a self adjusting force because it wants the object to remain at rest and not move. Therefore, if an external force is applied, the static force will be equal to the magnitude of external force, until it surpasses the threshold of the motion. Hence friction is a self-adjusting force.
  2. If there is no friction between any two surfaces in contact , then we will not be able to walk properly on the earth. Hence friction is necessary, But too much friction will reduce the efficiency of machines. Hence friction is a necessary evil.
  3. Friction allows us to hold anything, pick up anything , allows us to go anywhere . Same goes with riding a car or a bike. Thus friction is important force in our daily life.
Multiple choice viscosity option b: engineering physics properties of matter physics

Viscosity is most closely related to:

  1. density

  2. velocity

  3. friction

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

Viscosity is the property by virtue of which a liquid offers resistance for the relative motion between liquid molecules. Friction is the force which opposes relative motion between any two objects. So, viscosity is most closely related to friction.

Multiple choice viscosity option b: engineering physics properties of matter physics

Viscous force a is similar to friction in solids ,but viscous force
a. is independent of area but friction depends on area
b. is temperature dependent while friction force between solids depends upon normal reaction
c. is velocity dependent while friction is velocity independent

  1. a, b, c are correct

  2. a, c are correct

  3. b, c are correct

  4. a, b are correct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Viscosity depends of mass of body, temperature, velocity and density.
Where as friction depends only on normal reaction.