Motion refers to the change in position of an object over time, while force is a push or pull that causes or changes the motion of an object. Together, they are fundamental concepts in physics, describing how objects move and interact.
Physics Class 11 Chapter 3 Notes
For which pair ranges of projectile are same: 30o ,60o
The angle of projection for which the maximum height and the horizontal range of a projectile are equal to: tan–1 (4)
One ball is allowed to drop freely and the other is projected horizontally at the same time which ball will reach the ground earlier: Both will reach at the same time
Two projectile are projected at angle of 20o and 70o with same velocity which one have longer range: Both have same range
Ballistic trajectory is the path followed by projectile: Un-powered and unguided
For range to have maximum value, the function sin2 θ should have value: 1
Which parameter changes during projectile motion: vertical velocity
At the highest point during projectile motion: vertical component of velocity is zero
At maximum height of projectile motion, the angle between velocity and acceleration is: 90o
In projectile motion horizontal velocity: Zero
In projectile motion the acceleration in vertical direction is: zero
In projectile motion, acceleration has zero value along: Vertical direction
If the initial velocity of a projectile becomes doubled, the time of flight will be come: double
The velocity of projectile at maximum height is: vi cos θ
The angle for which the maximum height and horizontal range of a projectile equal to each other is: 76°
The range of projectile is same for: 35, 55
Ranges of projectile are equal for pair of angles: 40°, 50°
The horizontal component of velocity of projectile: remains constant
The horizontal range of a projectile at 30° with horizontal is same at an angle: 60°
Motion of a projectile is: action of gravity
Rocket ejects the burnt gasses at a speed of over (consuming fuel at rate of 10000 kg/s): 4000 m/s
The rocket carries its fuel in the form of: gases and solid
A typical rocket ejects the burnt gases at speeds of over: 4000ms-1
A mass of fuel consumed by a typical rocket to overcome earth‟s gravity is: 10000 kgs-1
__ mass of rocket is in the form of fuel: 80%
When a rocket moves upward its acceleration: increases continuously
When the bullet is fired from the rifle, it follows the principle of: conservation of momentum
When two objects undergoes an inelastic collision then: momentum does not change
In an inelastic collision: momentum is conserved
The collision in which linear momentum as well as K.E is conserved is called: nearly elastic collision
A tennis ball hits with the wall for collision time of 0.2 sec, if the impulse reduces to 10Ns then the impulsive force will be: 50N
The motor cycle‟s safety helmet prevents the serious injury due to padding because it: extends the time of impact, decreases the impulsive force
When the retarding time is increased during the impact than the average force: decreases
The rate of change in momentum is called: force
The force which might be enough to fracture the naked skull is: 5N
Does a moving object has impulse: may or may not be
In the absence of an unbalanced force, the momentum of an isolated system always: conserved
If the force of 250N acts on an object for 2 seconds, then change in momentum will be: 500Ns
Which bullet of same momentum is more effective in knocking a bear down: lead bullet
SI unit of momentum is same as that of: impulse
Direction of impulse is same as that of: change in momentum
The unit of impulse is: Ns
Force acting on a body is equal to: rate of change of momentum
A force of 10N act on a body of mass 10kg for 5 sec. The change in momentum of the body is: 50 Ns
The product of force and time is called: Impulse
A force of 10 N acts on a body of mass 5 kg for one second, the change in its momentum will be: 10 kg ms–1
Impulse has same unit as that of: linear momentum
The system on which no external force acts is called: isolated system
As we go at a greater height from the surface of earth, the value of g: decreases
If an object is moving with constant velocity of 20ms–1 towards north then its acceleration will be: 0ms–2
A paratrooper moves downward with: positive acceleration
Distance covered by a free falling body during 2nd second of its motion is: 4.9m
Acceleration due to gravity near the surface of the earth is: 9.8ms–2
If an object is dropped from the height h then its velocity is given by: gt
A mass of 1 kg is freely falling. The force of gravity is: 9.8 N
Distance travelled by free falling object in first second is: 4.9m
Equations of motion hold only when there is: linear motion with uniform acceleration
Important : Review all previous years’ 11 Class Past Papers for comprehensive practice and better exam preparation.