Balbharati solutions for सायन्स अँड टेक्नॉलोजी पार्ट १ [इंग्रजी] इयत्ता १० महाराष्ट्र राज्य मंडळ chapter 1 - Gravitation [Latest edition]

What are the effects of a force acting on an object?

What types of forces are you familiar with?

What do you know about the gravitational force?

What are Newton’s laws of motion?

If the area ESF in the given figure is equal to area ASB, what will you infer about EF?

Show that in SI units, the unit of G is Newton m² kg⁻². The value of G was first experimentally measured by Henry Cavendish. In SI units its value is 6.673 × 10⁻¹¹ N m² kg⁻².

Is there a gravitational force between two objects kept on a table or between you and your friend sitting next to you? If yes, why don’t the two move towards each other?

Assuming the acceleration remains constant, how long will Mahendra take to move 1 cm towards Virat?

What would happen if there were no gravity?

What would happen if the value of G was twice as large?

What would be the value of ‘g’ on the surface of the earth if its mass was twice and its radius half of what it is now?

Will the direction of the gravitational force change as we go inside the earth?

What will be the value of g at the centre of the earth?

Will your weight remain constant as you go above the surface of the earth?

Suppose you are standing on a tall ladder. If your distance from the centre of the earth is 2R, what will be your weight?

According to Newton’s law of gravitation, earth’s gravitational force is higher on an object of larger mass. Why doesn’t that object fall down with higher velocity as compared to an object with lower mass?

Study the entries in the following table and rewrite them putting the connected items in a single row.

What is the difference between the mass and weight of an object?

Will the mass and weight of an object on the earth be same as their values on Mars? Why? 

What is the free fall?

What is the acceleration due to gravity?

What is escape velocity? 

What is centripetal force?

Write the three laws given by Kepler. How did they help Newton to arrive at the inverse square law of gravity?

A stone is thrown vertically upwards with initial velocity u reaches a height ‘h’ before coming down. Show that the time taken to go up is the same as the time taken to come down.

If the value of g suddenly becomes twice its value, it will become two times more difficult to pull a heavy object along the floor. Why?

Explain why the value of g is zero at the centre of the earth.

Let the period of revolution of a planet at a distance R from a star be T. Prove that if it was at a distance of 2R from the star, its period of revolution will be \[\sqrt{8}\] T.

An object takes 5 s to reach the ground from a height of 5 m on a planet. What is the value of g on the planet?

The radius of planet A is half the radius of planet B. If the mass of A is M_A, what must be the mass of B so that the value of g on B is half that of its value on A?

The mass and weight of an object on earth are 5 kg and 49 N respectively. What will be their values on the moon? Assume that the acceleration due to gravity on the moon is 1/6th of that on the earth.

An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity? How long will the object take to come back to the earth? Assume g = 10 m/s².

A ball falls off a table and reaches the ground in 1 s. Assuming g = 10 m/s², calculate its speed on reaching the ground and the height of the table. 

The masses of the earth and moon are 6 × 10²⁴ kg and 7.4 × 10²² kg, respectively. The distance between them is 3.8 × 10⁵ km. Calculate the gravitational force of attraction between the two?
Use G = 6.7 × 10^–11 N m² kg^–2

The mass of the earth is 6 × 10²⁴ kg. The distance between the earth and the sun is 1.5 × 10¹¹ m. If the gravitational force between the two is 3.5 × 10²² N, what is the mass of the sun? Use G = 6.7 × 10^–11 N m² kg^–2

Take weights of five of your friends. Find out what their weights will be on the moon and the Mars.