GS One‑Liners
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5107
facts
5107
results
Latest facts first
| # | Question & Answer |
|---|---|
| 4226 |
What is the definition of work in physics?
-
Work is done when a force is applied on a body and the body is displaced in the direction of the force
|
| 4227 |
How is orbital speed of a satellite calculated?
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v = √(GM/R), where M is mass of Earth, R is orbital radius
|
| 4228 |
What is the relation between linear and angular velocity?
-
v = rω, where ω is angular velocity and r is radius
|
| 4229 |
How is angular velocity defined in circular motion?
-
Rate of change of angular displacement with time
|
| 4230 |
What is the difference between uniform and non-uniform motion?
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Uniform motion: constant velocity; Non-uniform: velocity changes with time
|
| 4231 |
Can momentum be conserved in a collision?
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Yes, in the absence of external forces
|
| 4232 |
What is the difference between weight and mass?
-
Mass is quantity of matter; weight is the gravitational force on the mass (W = mg)
|
| 4233 |
How is gravitational potential energy defined?
-
Work done to bring a mass from infinity to a point in a gravitational field
|
| 4234 |
What is the formula for centripetal acceleration?
-
a_c = v²/r
|
| 4235 |
How is satellite motion explained?
-
A satellite remains in orbit due to the balance between gravitational pull and its tangential velocity
|
| 4236 |
What is escape velocity?
-
Minimum velocity required to escape the gravitational field of a planet without further propulsion
|
| 4237 |
What are Kepler’s Laws of Planetary Motion?
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(1) Law of Orbits, (2) Law of Areas, (3) Law of Periods
|
| 4238 |
What is the acceleration due to gravity on Earth?
-
9.8 m/s²
|
| 4239 |
What is gravitational force?
-
Attractive force between two masses; F = G(m₁m₂/r²)
|
| 4240 |
What is centrifugal force?
-
Apparent force experienced by a body moving in a circular path, directed away from the center
|
| 4241 |
How is centripetal force defined?
-
Force directed towards the center of a circular path that keeps a body in circular motion
|
| 4242 |
What is the principle of conservation of momentum?
-
Total momentum of a system remains constant if no external force acts
|
| 4243 |
What is impulse?
-
Change in momentum of a body; impulse = Force × time
|
| 4244 |
What is momentum?
-
Product of mass and velocity of a body (p = mv)
|
| 4245 |
What is Newton’s Third Law of Motion?
-
For every action, there is an equal and opposite reaction
|
| 4246 |
What is the SI unit of force?
-
Newton (N)
|
| 4247 |
What is Newton’s Second Law of Motion?
-
Force is equal to the rate of change of momentum (F = dp/dt)
|
| 4248 |
What is inertia?
-
The tendency of a body to resist change in its state of motion
|
| 4249 |
What is Newton’s First Law of Motion?
-
A body remains at rest or in uniform motion unless acted upon by an external force
|
| 4250 |
Who formulated the three laws of motion?
-
Sir Isaac Newton
|