Question 1 :
The motion of the moon around the earth is due to the _____________.
Question 3 :
A block of wood is kept on a tabletop. The mass of wooden block is 5 kg and its dimensions are $40 cm \times 20 cm \times 10 cm$. What is the pressure exerted by the wooden block on the table top if it is made to lie on the table top with its sides of dimensions $40 cm \times 20 cm$?
Question 4 :
A ball thrown up vertically returns to the thrower after 6 s. Find the maximum height it reaches.
Question 5 :
How does the force of attraction between the two bodies depend upon distance between them?
Question 6 :
What happens to the force between two objects, if the mass of one object is doubled?
Question 7 :
A ball thrown up vertically returns to the thrower after 6 s.What is the velocity with which it was thrown up?
Question 9 :
The force that causes acceleration and keeps the body moving along the circular path acting towards the centre is called ________.
Question 10 :
Two objects of masses $m_1$ and $m_2$ having the same size are dropped simultaneously from heights $ h_1$ and $h_2 $respectively. What will the ratio of time they would take in reaching the ground be if one of the objects is hollow and the other one is solid ?
Question 11 :
The weight of any person on the moon is about $\frac{1}{6}$ times that on the earth. He can lift a mass of 15 kg on the earth. What will be the maximum mass, which can be lifted by the same force applied by the person on the moon?
Question 14 :
The weight of an object at the centre of the earth of radius R is ______.
Question 15 :
A ball thrown up vertically returns to the thrower after 6 s.What is its position after 4 s?
Question 16 :
What do we call the gravitational force between the earth and an object?
Question 17 :
The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them, then the gravitational force would become ___.
Question 18 :
A stone is released from the top of a tower of height 19.6 m.What is its final velocity just before touching the ground?
Question 21 :
Suppose gravity of earth suddenly becomes zero, then in which direction will the moon begin to move if no other celestial body affects it?
Question 23 :
A car falls off a ledge and drops to the ground in 0.5 s. Let $g = 10 \ m s^{–2}$ (for simplifying the calculations).How high is the ledge from the ground?
Question 25 :
A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g = 10 $m/s^2$,What is the net displacement and the total distance covered by the stone?