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 measurements and units measuring mass measurement of mass measuring instruments

Spring of spring balance must be _______ in nature.

  1. Elastic

  2. Non-elastic

  3. Rubber

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

Spring balance is used to measure the weight of the object. The working principle of spring balance is Hooke's law. Since Hooke's law is valid only for elastic objects, thus spring used in the spring balance must be elastic in nature.

Multiple choice physics measurements and units measuring mass measurement of mass measuring instruments

The working principle of spring balance is :

  1. Newton's laws of motion

  2. Hooke's law

  3. Ohm's law

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

Spring balance is used to measure the weight of the object. When a load is hung on the spring, it stretches and the spring's extension is proportional to the weight of the object. The working principle of the spring balance is Hooke's law  which is  $F = -kx$.

Multiple choice

Which of the following is a Newton's 3rd law pair?

  1. Air resistance and weight for a sky diver

  2. Engine thrust and friction for a car

  3. Rocket pushing gases backwards, gases pushing rocket forward
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Newton's 3rd law states that for every action, there is an equal and opposite reaction acting on different bodies. The rocket and gas pair represents two objects exerting forces on each other, whereas the other options describe forces acting on a single object.

Multiple choice

Newton's 2nd law can be written as?

  1. Force = rate of change of mass

  2. Force = rate of change of acceleration

  3. Force = rate of change of energy

  4. Force = rate of change of momentum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Newton's 2nd law defines force as the rate of change of momentum (F = dp/dt). This is the most fundamental form of the law.

Multiple choice

Which answer correctly describes momentum (p), mass(m) and velocity(v)?

  1. p - vector, m - vector, v - vector

  2. p - scalar, m - scalar, v - scalar

  3. p - vector, m - vector, v - scalar

  4. p - vector, m - scalar, v - vector
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Momentum (p) is a vector quantity because it is the product of mass (a scalar) and velocity (a vector). Therefore, p and v are vectors, while m is a scalar.