Intro to mechanics

1. Quantities in
Mechanics:
Scalar vs vector
BY TREVOR BENNETT

2. Introduction
 Interestingly, when looking at the topic of quantities in Kinematics, we
always jump to scalar and vector quantities without addressing the
question:
What is a quantity?

3. Quantities
 A physical quantity is one which can be measured. All
quantities can be classified as scalar and vector
quantities.

4. Quantities

5. Distance vs Displacement

8. Examples of speed and velocity
 According to Top End Sports (2018), the
day after Usain Bolt's 9.58 100m world
record, the IAAF released details of the split
times for that race. The time for each 20m
distance of the race was recorded. For Bolt,
the fastest interval (60m to 80m) was run at
an average speed of about 45 km/hr,
12.42 m/s).
 When the universe boss, Chris Gayle, hits a
ball at a rate of 100 mph over midwicket we
are talking about velocity due to the fact
that there is magnitude and direction.


9. Examples of speed and velocity
 A car travelling at 150 mph that is considered to high
magnitude, which is speed: very dangerous speed
 Now if the car is going around corner, it is considered to be
velocity. Why? Because direction keeps changing.

10. Scalar
quantities
 Mass
 Length
 Time
 Density
 Speed
 Area
 volume

11. Vector Algebra

12. Attention quiz
d – c = a – b Is this vector algebra
correct

13. That’s all for now
folks!