Give reason:
a. A piece of paper takes much longer to fall than a stone through the same distance. When both are dropped simultaneously.
b. The mass is constant everywhere the weight keeps changing.
B. The weight of the man on earth is 150 N and on certain planet is 25 N. Take g= 10M/S2 on earth.
c. Find the mass of the man on earth and planet.
d. Find the acceleration due to the gravity on the planet.
Answers
Answer:
a) " A piece of paper takes much longer to fall than a stone through the same distance because the paper is lighter in weight and has a large surface area so it hails in the air and takes much time to reach the ground whereas the density of stone (which is solid) is large.
b) Because weight depends on gravity, if you are in gravity then the weight will differ as compared to earth. Mass is constant because mass is the quantity of matter present in an object and it does not change with gravity.
c) We know that, W = mg [ here w is weight , m is Mass and g is the acceleration due to gravity.] We know the mass remains the same in all places. So the mass of the man is 15 kg on earth and on certain planet.
d) In the first equation above, g is referred to as the acceleration of gravity. Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2.
Answer:
1.the mass of the piece of paper is very less as compared to that of stone and as stone is dropped the atmosphere acts on it in a very less amount whereas when a paper is dropped the air pressure pushes it upward making its speed slow
2. mass is the amount of material in some body which keeps on constant everywhere in the universe where as the weight depends on the gravitational force on any object which is applied by Earth or any other planet or star as this gravitational force is different for different planets and starts the weight keeps on changing continuously
4.the mass of a man on earth and planet is same as mass does not change and is constant in the universe for example if we take a mass of a man as the 20 Newton then it will remain the same on moon as well as on other planet like Jupiter or in the space.
5.the acceleration due to gravity on Earth is 9.8 metre per second square