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Gravitation chapter is not a tough lesson.first understand the chapter consept and second practice the question and finally we know this chapter is not hard.
What you have learnt & Summary
•The law of gravitation states that the force of attraction between any two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them. The law applies to objects anywhere in the universe. Such a law is said to be universal.
•Gravitation is a weak force unless large masses are involved. The force of gravity decreases with altitude. It also varies on the surface of the earth, decreasing from poles to the equator.
•The weight of a body is the force with which the earth attracts it.
•The weight is equal to the product of mass and acceleration due to gravity.
•The weight may vary from place to place but the mass stays constant.
•All objects experience a force of buoyancy when they are immersed in a fluid.
•Objects having density less than that of the liquid in which they are immersed, float on the surface of the liquid. If the density of the object is more than the density of the liquid in which it is immersed then it sinks in the liquid.
MCQ Question with Video Solution
Who gave the concept of gravitational force
A) Albert Einstein
B) Sir Isaac Newton
C) Henry keyendies
D) Gellileo
Ans a
The value of quantity G in the formula for gravitational force:
A) Depends on mass of the earth only
B) Depends on the radius of earth only
C) Depends on both mass and radius of earth
D) Depends neither on mass nor on radius of earth
Ans c
Which of the following is the SI unit of mass is?
A) m/s
B) kg
C) Newton
D) Pascal
Ans b
What is the SI unit of weight is?
A) m/s²
B) kg
C) Newton
D) Pascal
Ans c
Mass of a body can be measured with the help of
A) Spring balance
B) Common balance
C) Analytical balance
C) None of them
Ans b
Weight of a body can be measured with the help of
A) Spring balance
B) Common balance
C) Analytical balance
C) None of them
Ans a
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