1. Physics: It’s all around you…
What is Physics?

2. What is Physics?
Deals with:

3. What is Physics?
Physics is the science concerned with the fundamental laws of the universe.
Deals with:
Matter
Energy
Space
Time
And all their interactions

4. What is Motion?
Motion deals with a continuous change in the position of a body relative to a reference point, as measured by a particular observer in a particular frame of reference
Why should we study motion?

5. Types of Motion Uniform Motion:
Non-uniform Motion (Accelerated Motion):

6. Types of Motion
Uniform Motion: motion at constant velocity, with no change in speed or direction
Non-uniform Motion (Accelerated Motion): motion with changing speed, or direction, or both; motion in which the velocity is changing.

7. Quantities
Scalar:
Vector:
Reference Point

8. Quantities
Scalar:
A physical quantity that has magnitude (size), and unit, but not direction (e.g., distance, time, speed)
Vector:
A physical quantity that has magnitude (size), unit, and direction (e.g.,position, displacement, velocity, acceleration)
Reference Point
The point from which position is measured; usually the origin or starting point.

9. Motion Variables
Variable
Symbol
Unit
Meaning
Example
Scalar/
Vector
Distance
Position
Displacement
Change in Time m, km
The total length of a journey along every twist and turn of the path
Yummy House is 25 m from the school d
Scalar
An object’s location as seen by an observer from a particular view-point (reference point)
The hospital is 3 km [NE] of Riverdale C. I.
m ,km
[N,E,S,W]
Vector
The change in position of an object
The car moved 3 km [N]
d1: initial position
d2: final position
m ,km
[N,E,S,W]
Vector s, hr
It took the car 4 seconds to stop
The duration of an event
Scalar

10. Motion Variables (cont.)
Symbol
Unit
Meaning
Example
Scalar/
Vector
Speed
Velocity
Instantaneous
Acceleration
m/s,
km/h
I was running at 7 m/s v
Scalar
How fast something is moving.
m/s ,
km/h
[N,E,S,W]
How fast an object’s position is changing, that is the rate of change of position.
I was driving 110 km/h [W] on the Gardiner
Vector
m/s ,
km/h
[N,E,S,W]
The velocity of an object at a specific moment
At 5 pm the train was travelling 90 km/h [E]
Vector
m/s2 ,
km/h/s
[N,E,S,W]
How much an object’s velocity changes in a certain time; rate of change of velocity
F1 cars can accelerate at a rate of 10 m/s2
Vector