Class 8 Science | Relative Velocity

Science and Technology, Class 8

Relative Velocity

Reference point · Three situations · Two rules

By the end of this lesson students will

📍

say what a reference point is

🚌

explain why rest and motion are relative

➖

subtract to find relative velocity in the same direction

➕

add to find relative velocity in opposite directions

Opening question

The person on the bus seat

LOOK

The bus is speeding along and the passenger is on his seat.

FROM BUS

With respect to the bus he has not shifted, so he is at rest.

FROM TREE

With respect to a roadside tree he is at a new place each moment, so he is moving.

Rest and motion are relative states.

The notes are free to read in full.

Presenter notes: Today we start from a passenger inside a moving bus and end with the two rules for the relative velocity of two vehicles.