| #3676 |
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 |
| #3677 |
How is orbital speed of a satellite calculated? |
v = √(GM/R), where M is mass of Earth, R is orbital radius |
| #3678 |
What is the relation between linear and angular velocity? |
v = rω, where ω is angular velocity and r is radius |
| #3679 |
How is angular velocity defined in circular motion? |
Rate of change of angular displacement with time |
| #3680 |
What is the difference between uniform and non-uniform motion? |
Uniform motion: constant velocity; Non-uniform: velocity changes with time |
| #3681 |
Can momentum be conserved in a collision? |
Yes, in the absence of external forces |
| #3682 |
What is the difference between weight and mass? |
Mass is quantity of matter; weight is the gravitational force on the mass (W = mg) |
| #3683 |
How is gravitational potential energy defined? |
Work done to bring a mass from infinity to a point in a gravitational field |
| #3684 |
What is the formula for centripetal acceleration? |
a_c = v²/r |
| #3685 |
How is satellite motion explained? |
A satellite remains in orbit due to the balance between gravitational pull and its tangential velocity |
| #3686 |
What is escape velocity? |
Minimum velocity required to escape the gravitational field of a planet without further propulsion |
| #3687 |
What are Kepler’s Laws of Planetary Motion? |
(1) Law of Orbits, (2) Law of Areas, (3) Law of Periods |
| #3688 |
What is the acceleration due to gravity on Earth? |
9.8 m/s² |
| #3689 |
What is gravitational force? |
Attractive force between two masses; F = G(m₁m₂/r²) |
| #3690 |
What is centrifugal force? |
Apparent force experienced by a body moving in a circular path, directed away from the center |
| #3691 |
How is centripetal force defined? |
Force directed towards the center of a circular path that keeps a body in circular motion |
| #3692 |
What is the principle of conservation of momentum? |
Total momentum of a system remains constant if no external force acts |
| #3693 |
What is impulse? |
Change in momentum of a body; impulse = Force × time |
| #3694 |
What is momentum? |
Product of mass and velocity of a body (p = mv) |
| #3695 |
What is Newton’s Third Law of Motion? |
For every action, there is an equal and opposite reaction |
| #3696 |
What is the SI unit of force? |
Newton (N) |
| #3697 |
What is Newton’s Second Law of Motion? |
Force is equal to the rate of change of momentum (F = dp/dt) |
| #3698 |
What is inertia? |
The tendency of a body to resist change in its state of motion |
| #3699 |
What is Newton’s First Law of Motion? |
A body remains at rest or in uniform motion unless acted upon by an external force |
| #3700 |
Who formulated the three laws of motion? |
Sir Isaac Newton |