Mechanics

​Isaac Newton

​Galileo Galilei

​Albert Einstein

​Motion

Motion is relative​

• Motion is the change in​ position of an object (it basically means movement).

• Although you are sitting still now, you are actually moving at 100,000 km/h relative to the Sun​

​Concept Check

Open Ended

Relative to the bus, what is the speed of the pencil?

Open Ended

Relative to the road, what is the speed of the pencil?

Open Ended

Suppose you drop the pencil. While it is falling, and relative to the road, what is the speed of the pencil?

Poll

Suppose you drop the pencil. Relative to the road, the pencil will hit the floor at a place directly...

• behind you

• at your feet below your hand

• in front of you

Poll

Suppose you drop the pencil. Relative to you, the way the pencil drops...

• is the same as if the bus were at rest

• depends on the velocity of the bus

​Distance & Displacement

Distance

• Distance is how far an object has moved.

• It is a scalar quantity.

• A scalar quantity only has magnitude or numerical value (size)​

​Distance & Displacement

Displacement

• Displacement is how far an object has moved from its original position

• It is a vector quantity.

• A vector quantity has magnitude (size) and direction​

​Concept Check

Open Ended

What is the total distance that the student has walked?

Open Ended

What is the student's displacement?

Open Ended

Explain the difference between distance and deisplacement.