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Numericals from Newton’s Laws of motion based on F=ma (For calss XI students of Kendriya Vidyalaya Pattom)

Download the questions and solve them and submit on or before 9 Oct 2014

  1. A force acts for 10 s on a body of mass 10 kg after which the force ceases and the body describes 50 m in the next 5 s. Find the magnitude of the force. [Ans: 10 N]
  2. A  truck starts from rest and rolls down a hill with constant acceleration. It travels a distance od 400 m in 20s. Calculate the acceleration and the force acting on it if its mass is 7 metric tonnes. [Ans: 2 m/s2, 14000N]
  3. A motor car running aat the rate of 7 m/s can be stopped by applying brakes in 10 m. Show that total resistance to the motion, when the brakes are on is one fourth of the weight of the car.
  4. In an Xray machine, an electron is subjected top a force of 10-23 N. In how much time the electron will cover a distance of 0.1 m,? Take the mass of the electron = 10-30 kg

Numericals from Newton’s Laws of motion based on F=ma (For calss XI students of Kendriya Vidyalaya Pattom)

Download the questions and solve them and submit on or before 9 Oct 2014

  1. A force acts for 10 s on a body of mass 10 kg after which the force ceases and the body describes 50 m in the next 5 s. Find the magnitude of the force. [Ans: 10 N]
  2. A  truck starts from rest and rolls down a hill with constant acceleration. It travels a distance od 400 m in 20s. Calculate the acceleration and the force acting on it if its mass is 7 metric tonnes. [Ans: 2 m/s2, 14000N]
  3. A motor car running aat the rate of 7 m/s can be stopped by applying brakes in 10 m. Show that total resistance to the motion, when the brakes are on is one fourth of the weight of the car.
  4. In an Xray machine, an electron is subjected top a force of 10-23 N. In how much time the electron will cover a distance of 0.1 m,? Take the mass of the electron = 10-30 kg

Why moon does not fall to Earth?

The moon does not fall to earth because of its tangential velocity. The following video explains it well.

English: Diagram of orbital motion of a satell...

The initiative http://lunarscience.nasa.gov/ask-a-scientist/ by NASA will answer all your doubts on moon.

Moon Landing

It is said  that there is no atmosphere in moon therefore no air but when Neil Armstrong landed on moon first and hosted the us flag it flapped. how can this happen??

(See the photograph below)
The photograph below shows the photographs of flag taken from two different angles at slightly different times. Watch the curls and curves on flag. They have not changed
Lunar landing flag

Vishnu Comments: “hosting could have sent a disturbance up the pole and thru the flag. Does it flap? we cant say that from a fotto. in moons surface, if we keep the flag with curls, the curls stays there.  is there a vdo of flapping? After all its not worth discussing a lot over this”

 

Past Human Lunar Expeditions

Apollo 8  (21-27 December 1968)

Frank Borman, William Anders, James Lovell

Apollo 10 (18-26 May 1969)

Thomas Stafford, Eugene Cernan, John Young

Apollo 11 (16-24 July 1969)

Neil Armstrong, Edwin Aldrin, Michael Collins

21h 36m / 2h 31m / 21.6 kg

Apollo 12 (14-24 November 1969)

†Charles Conrad, Alan Bean, Richard Gordon

31h 31 m / 7h 45m / 34.3 kg

Apollo 13 (11-17 April 1970)

James Lovell, Fred Haise, †John Swigert

Apollo 14 (31 January – 9 February 1971)

†Alan Shepard, Edgar Mitchell, †Stuart Roosa

33h 30m / 9h 21m / 42.8 kg

Apollo 15 (26 July – 7 August 1971)

David Scott, †James Irwin, Alfred Worden

66h 54m / 19h 6m / 76.7 kg

Apollo 16 (16-27 April 1972)

John Young, Charles Duke, Thomas Mattingly

71h 2m / 20h 14m / 94.5 kg

Apollo 17 (7-19 December 1972)

Eugene Cernan, Harrison Schmitt, †Ronald Evans

74h 59m / 22h 2m / 110 kg

 

 

 

 

 

 

 

 

 

Gravity on moon

We know that the first man to walk on moon was Neil Armstrong. it is said that there is  no force of gravity on moon. then how did Neil Armstrong moved a few steps on moon?

(Saranya asks)

Answer:

Who says there is no gravity in moon?

The acceleration due to gravity on moon is 1/6 that on earth.

I feel that you are confused by the concept of weightlessness in satellites.

On moon, it has its own gravity which is one sixth that on earth.

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