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प्रश्न
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.
उत्तर
Given: Mass on earth (me) = 5 kg, weight on earth (We) = 49 N,
acceleration due to gravity on moon (gm) = `9.8/6` m/s2 = 1.6333 m/s2
To find: Mass (mm), weight (Wm) on moon
Formula: Wm = mmgm
Calculation: The mass of the object is independent of gravity and remains unchanged i.e., 5 kg.
From formula,
Wm = 5 × 1.6333
∴ Wm = 8.1665 N ≈ 8.17 N
On moon, the mass of the object is 5 kg and the weight is 8.17 N.
संबंधित प्रश्न
What do you mean by acceleration due to gravity?
Which force is responsible for the moon revolving round the earth ?
When an object is dropped from a height, it accelerates and falls down. Name the force which accelerates the object.
What force is responsible for the earth revolving round the sun ?
State whether the following statement is true or false :
The acceleration due to gravity acting on a freely falling body is directly proportional to the mass of the body.
Explain what is meant by the equation :
`g= Gxxm/r^2`
where the symbols have their usual meanings.
What do you mean by the term free fall ?
Give reason for the following :
The force of gravitation between two cricket balls is extremely small but that between a cricket ball and the earth is extremely large.
Explain why, if a stone held in our hand is released, it falls towards the earth.
Why does a sharp knife cut objects more effectively than a blunt knife ?
Name the force which wears away two surfaces as they move over one another.
Name the force which pulled the apple off Isaac Newton’s tree.
Name the force which stops you falling through the floor.
A pressure of 10 Pa acts on an area of 3.0 m2. What is the force acting on the area ? What force will be exerted by the application of same pressure if the area is made one-third ?
For freely falling object we can write the Newton’s second equation of motion as …..
A force acts for 0.1 s on a body of mass 2.0 kg initially at rest. The force is then withdrawn and the body moves with a velocity of 2 m s-1. Find the magnitude of the force.
What force, in newton, your muscles need to apply to hold a mass of 5 kg in your hand? State the assumption.
What is the acceleration due to gravity?
Write a short note.
Escape Velocity
Read the given passage carefully and answer the questions.
We know that the force of gravity due to the earth acts on each and every object. When we were holding the stone in our hand, the stone was experiencing this force, but it was balanced by a force that we were applying on it in the opposite direction. As a result, the stone remained at rest. Once we release the stone from our hands, the only force that acts on it is the gravitational force of the earth and the stone falls down under its influence. Whenever an object moves under the influence of the force of gravity alone, it is said to be falling freely. Thus the released stone is in a free fall. In free fall, the initial velocity of the object is zero and goes on increasing due to the acceleration due to the gravity of the earth. During free fall, the frictional force due to air opposes the motion of the object and a buoyant force also acts on the object. Thus, true free fall is possible only in a vacuum.
1) Complete the following statement by choosing the right option.
The stone held in the hand is stable because on it __.
- two unbalanced forces are exerted.
- only the gravitational force of the earth is exerted.
- gravitational force of the earth is not exerted.
- two balanced forces are exerted.
2) Why does free fall not happen on the earth?
3) Why does the velocity of the object increase during the free fall?
4) Which type of force exerts on the object during free fall?
5) Why does free fall happen only in a vacuum?
