LINEAR KINEMATICS- distance and displacement,speed and velocity,

Acceleration

A Presentation

DISTANCE: Distance refer to a physical length . when body

moves from one location to another, the length of the path that the body follows is the distance , e.g. when a runner completes 2 laps around a 400m track , the distance that the runner has covered is equal to (400+400) 800m •Distance is a scalar quantity • It only has magnitude

DISPLACEMENT: It is change in position.displacement is the shortest distance from the initial position to the final position of a point.it is measured in a straight line.e.g. in the completetion of a lap around the 400m track,the displacement is zero because the starting and finishing positions are the same. •Vector quantity •Both magnitude and direction

Units of distance and displacement are Foot millimeter(mm)is 1/1000m, centimeter(cm) is 1/100m, and kilometer(km) is 1000m.

speed

l=length of path t=time ∆=delta(or)change in time s=average speed

•Speed is a scalar quantity •Units are Miles/hour , meters/second,feets/second

Speed is the rate at which an object covers distance.

It is defined as the distance covered , divided by the

time taken to cover it.

VELOCITY

Velocity is the change in position or the displacement that occurs during a given period of time.

v= velocity d=displacement t=time ∆=delta(or)change in time

•Velocity is a vector quantity,as it has magnitude and direction •Unit are meters/second

❑:- The rate of change of velocity is called acceleration. • May be positive may be negative. a= v/t or a = d/t2 = m/sec2 unit

ACCELERATION

•Positive acceleration:the final velocity(v2) will be greater than initial velocity(v1) •Negative acceleration: the final velocity(v2) will be less than initial velocity(v1) [deacceleration ]

•Unit are meters/second2

Q1. Dispacement is a vector quantity.

(A). TRUE

(B). FALSE

Q2. Vector quantity only has Direction.

(A). TRUE

(B). FALSE

Q3. Distance is a Scalar Quantity.

(A). TRUE

(B). FALSE

Q4.Accelaration is the rate of change

of_____.

Q5. Scalar has only ______

• Q6. Scaler quantity only has magnitude.

(A). TRUE

(B). FALSE

Q7.

Q8.

Q9.

Q10.

Q12. Different between distance and displacement

Q12. Speed is defined as the rate of change of

distance.

(A). TRUE

(B). FALSE

Q13.Different between speed and velocity

Q14. Velocity is a vector quantity.

(A). TRUE

(B). FALSE

Q15.Speed is a vector quantity

(A). TRUE

(B). FALSE