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Relative Nature of Motion

Now we know that motion is a relative term.So absolute motion has no meaning, right?
So aren’t Galileo’s view that earth moves around sun and the church’s old belief that sun moves around earth actually not equally correct or equally wrong?
this is a question from hc verma’s concept of physics part 1.(from short answer questions)

Deepali Gupta asked

Answer: The state of motion as well as the nature of motion is relative. When we speak about any of these without SAYING  any reference, we actually have some reference in mind.

When we say that earth is moving around the sun, it is true wrt sun. But, the actual nature of motion is unpredictable since the sun, the galaxy and all are in a state of motion. So, we can say about the nature of motion only with respect to some reference which is assumed to be at rest.

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A Numerical Problem – Kinamatics

A particle is thrown vertically upward with a velocity of 19.6 m/s. Find (a) the acceleration of the particle at the highest point. (b) How high the particle will rise? (c) Time taken for rising to highest point.

CBSE Physics MCQ for quick revision – Mechanics

  • If the object is in equilibrium, the sum of all the forces acting on the object is zero.
    1. Inertia
    2. Force
    3. Mechanical Equilibrium
    4. Equilibrium rule

 

  • A push or a pull on an object.
    1. Inertia
    2. Force
    3. Mechanical Equilibrium
    4. Equilibrium rule

 

  • The tendency of objects to resist changes in motion.
    1. Inertia
    2. Force
    3. Mechanical Equilibrium
    4. Equilibrium rule

 

  • An object is in a state where there is no change in motion.
    1. Inertia
    2. Force
    3. Mechanical Equilibrium
    4. Equilibrium rule
  • How fast an object is moving, and in what direction.
    1. Speed
    2. Velocity
    3. Acceleration
    4. Free fall
  • How fast an object is moving, without consideration of direction.
    1. Speed
    2. Velocity
    3. Acceleration
    4. Free fall
  • An object is falling under the influence of gravity, and with no air-resistance.
    1. Speed
    2. Velocity
    3. Acceleration
    4. Free fall
  • The rate at which velocity is changing with time.
    1. Speed
    2. Velocity
    3. Acceleration
    4. Free fall

 

A body is dropped from a tower of height 96 m. Another body is thrown up from the ground after a second with a velocity of 40 m/s.When and where they will meet?

A body is dropped from a tower of height 96 m. Another body is thrown up from the ground after a second with a velocity of 40 m/s. When and where they will meet?
SOUNDARYA asked
 Answer:
For the first body,
u=0 m/s
Let S=x (from top)
x=0.5 gt2  ————— (1)
For the second body,
u=40 m/s
a=-g
S=96-x
96-x=40 t -0.5 gt2 ———–(2)
(1) + (2) =>
96=40t
or
t=96/40 = 2.4 […]


More problems coming in; Try to answer now!

Stuti posted these:
a particle is thrown with  any velocity vertically upward. the distance traveled by particle in last sec of ascent is 1)g 2)g/2 3)g/4 4)cant be calculated
a ball is dropped from a bridge of 122.5 metre above a river. after ball has been falling for 2 sec,a second ball is thrown straight down after it. initial […]


Problem from relative velocity

A Boat covers certain distance between two spots in a river taking t1 hrs going downstream and t2 hrs going upstream. What time will be taken by boat to cover same distance in still water?
posted by STUTI
Answer:
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Homework from vectors

A man walks 10 km towards west and then 12 km (60 degree_ direction of North-East. find the resultant vectors, magnitude and direction. A man walks 10 km towards west and then 15 km towards south. Find the resultant vectors, magnitude and direction. Justify and comments either quantity scalar or vector. Weight Temperature Velocity Work Distance Speed […]

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