Motion And Force Flashcards
Displacement
Change in the position of body from its initial position to its final position.
Velocity
Rate of change of displacement
Acceleration
Rate of change of velocity
Newton’s first law of motion
The mass of the object is the quantitative measure of its inertia.
Momentum
Product of mass and velocity
Impulse
When a large force acts on a body for short interval of time, then the product of force and time is impulse
Law of conservation of momentum
The total linear momentum of an isolated system remains constant
Elastic collision
A collision in which K.E. of the system is conserved
Inelastic collisions
A collision in which K.E. of the system is not conserved
Projectile motion
The two dimensional motion under constant acceleration due to gravity and inertia
Height of projectile
The maximum distance covered by the projectile
Time of flight
The time taken by a body to cover a distance from place of projection to the place where it hits the ground
Range of projectile
Maximum distance which a projectile covers in horizontal direction
Ballistic flight
Ballistic flight is that in which a projectile is given an initial push and then allowed to move freely due to inertia and under the action of gravity
Ballistic missile
An unpowered and unguided missile
Ballistic trajectory
The path followed by ballistic missile
Uniform velocity
In case of uniform velocity, the body covers equal displacement in equal intervals of time
Both magnitude and direction remains the same
Variable velocity
In case of variable velocity body covers unequal displacement in equal intervals of time
The magnitude and direction of velocity or both may change
An object is thrown vertically upward. Discuss the sign of acceleration due to gravity, relative to velocity, while the object is in air?
Sign of acceleration due to gravity relative to velocity is negative
Can the velocity of an object reverse direction when acceleration is constant? If so give an example.
Yes it can be possible.
When a body is thrown vertically upward it’s velocity goes on decreasing due to gravity and becomes zero at maximum height. After that it will reverse it’s direction of velocity, but the acceleration remains constant during whole flight
Explain
V and a are parallel
If the velocity of car is increasing along a straight path then velocity v and acceleration a are parallel
Explain
V and a are anti parallel
If the velocity of the car is decreasing along a straight path then velocity v and acceleration a are anti parallel
Explain
V and a are mutually perpendicular
When a body moves in a circular path then velocity v and acceleration a are mutually perpendicular
Explain
A is zero but v is not zero
When car moves with uniform velocity then a is zero but v is not zero.
