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 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.

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

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 ACCELERATION

❑:- 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

• 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