Topic 1: Introduction to Gravitation

Introduction to Gravitation

Gravitation is the force of attraction that exists between any two bodies having mass. This force acts along the line joining the centres of the two bodies.

Gravitation is a universal force because it acts between all objects in the universe.

Discovery of Gravitation

The law of gravitation was proposed by Sir Isaac Newton. He concluded that every particle in the universe attracts every other particle with a force.

Nature of Gravitational Force

  • It is always attractive
  • It is a long-range force
  • It acts between masses
  • It is a central force

Examples of Gravitation

  • Falling of objects towards the Earth
  • Planets revolving around the Sun
  • Moon revolving around the Earth

Importance of Gravitation

  • Explains motion of planets and satellites
  • Responsible for weight of bodies
  • Holds atmosphere around the Earth

Main Topics Covered in This Chapter

  • Newton’s law of gravitation
  • Gravitational constant
  • Acceleration due to gravity
  • Mass and weight
  • Variation of g
  • Gravitational potential energy
Q1. Gravitation is the force of attraction between:
A) Only planets
B) Only stars
C) Any two masses
D) Only Earth and Moon

Answer: C


Q2. Gravitational force is always:
A) Repulsive
B) Attractive
C) Zero
D) Variable in direction

Answer: B


Q3. Who proposed the law of gravitation?
A) Einstein
B) Galileo
C) Newton
D) Kepler

Answer: C


Q4. Gravitation is called a universal force because:
A) It acts only on Earth
B) It acts only in space
C) It acts between all masses
D) It acts only on large objects

Answer: C


Q5. Which of the following is due to gravitation?
A) Electric current
B) Magnetic field
C) Falling of objects
D) Sound propagation

Answer: C

Chapter 5: Laws of Gravitation

Topic 1: Introduction – Quick Revision

1. Gravitation

Force of attraction between any two bodies having mass.

2. Nature

  • Always attractive
  • Acts between masses
  • Long-range force

3. Discovered By

Sir Isaac Newton

4. Examples

  • Falling of objects
  • Motion of planets
  • Revolution of moon

Exam Focus (MHT-CET)

Direct MCQs are asked on definition, nature and examples of gravitation.


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