1. Lesson 1: Velocity and Acceleration
P2 – Forces and Motion
Lesson 1: Velocity and Acceleration

2. Lesson Objectives To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.

3. Speed and Velocity What is meant by the terms: Speed? Velocity?
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Speed and Velocity
What is meant by the terms:
Speed?
Velocity?
is just how fast you are going with no regard to the direction.
Must have the direction specified as well as the speed.

4. Speed and Velocity Are these examples of speed or velocity? So:
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Speed and Velocity
Are these examples of speed or velocity?
So:
Speed and velocity are both measured in the same units and say how fast you are going.
Velocity though gives you the direction too.
30 mph
Speed
30 km/h north
Velocity
15 cm/s
Speed
10 m/s, 0600
Velocity

5. Speed and Velocity Remember: Speed is measured in mph, km/h, m/s, cm/s
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Speed and Velocity
You need to be able to calculate the speed of an object. What do you need to know? (think about the units of speed).
How far something has travelled - distance
How long it took to travel that distance – time.
Remember: Speed is measured in mph, km/h, m/s, cm/s

6. Speed and Velocity d t s So the formula to work out speed is:
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Speed and Velocity
So the formula to work out speed is:
Remember: Speed is measured in mph, km/h, m/s, cm/s
So the answer is in the units:
Distance = Speed
Time d t s

7. Speed and Velocity d t s So the formulas are: Speed = Distance Time
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Speed and Velocity
So the formulas are:
Speed = Distance
Time d t
Time = Distance
Speed s
Distance = Speed x Time

8. Speed and Velocity d t s Lets use the formulas:
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Speed and Velocity
Lets use the formulas:
A cat walks 20m in 35s. Find:
Its speed
How long it takes to walk 100m d t s
1a. Speed = Distance = 20m
Time s
Answer: 0.57 m/s (remember units)

9. Speed and Velocity d t s Lets use the formulas:
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Speed and Velocity
Lets use the formulas:
A cat walks 20m in 35s. Find:
Its speed
How long it takes to walk 100m d t s
1b. Time = Distance = m_
Speed m/s
Answer: 175s (remember units)

10. Speed and Velocity d t s Lets use the formulas:
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Speed and Velocity
Lets use the formulas:
To calculate velocity, we use the same formula.
All that we would need to add is the direction that the cat was walking. d t s

11. Task Answer the questions for you given number (6 questions).
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Task Answer the questions for you given number (6 questions).

12. Acceleration What is meant by the term: Acceleration?
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Acceleration
What is meant by the term:
Acceleration?
Is how quickly something is speeding up.
(i.e. how quickly velocity is changing)
It is not the same as speed and velocity.

13. Acceleration  v t a So the formula to work out acceleration is:
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Acceleration
So the formula to work out acceleration is:
Change in velocity = Acceleration
Time Taken
v = change in velocity
 v t a

14. Acceleration Units What are the units for acceleration?
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Acceleration Units
What are the units for acceleration?
Change in velocity = Acceleration
Time Taken
Velocity is m/s
Time is s
So: m/s s
Answer: m/s2

15. Acceleration  v t a Lets see if we can use the formula:
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Acceleration
Lets see if we can use the formula:
A bike accelerates steadily from 2m/s to 6m/s in 5.6s. Find the acceleration:
v = 6m/s – 2m/s = 4m/s
a = ?
T = 5.6s
So: Acceleration =  Velocity = 4m/s
Time Taken s
Answer: 0.71 m/s2
 v t a

16. Questions a. Find the speed of the mouse which hobbles 3.2m in 35s.
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Questions
a. Find the speed of the mouse which hobbles 3.2m in 35s.
b. Find how far it will get in 25 minutes.
2. A speed camera is setup in a 30mph (13.4 m/s) zone. It takes two photographs 0.5s apart.
A car travels 6.3m between the two photographs. Is the car breaking the speed limit?
3. What is the acceleration of a coin flicked from rest to a speed of 14m/s in 0.4s?
0.09m/s
137m No
(12.6m/s)
35m/s2

17. Task Answer the questions for you given number (6 questions).
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Task Answer the questions for you given number (6 questions).

18. Are you now able to….
To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
I still feel unsure. I need some more help to understand.
I feel ok. I need to do some more work to check my understanding.
I am happy and feel I understand and can explain the main points.

19. To know the difference between speed and velocity.
To be able to calculate speed.
To be able to calculate acceleration.
Keywords: Speed, Velocity, Acceleration,
Using only the following materials you need to design and make a run for a marble to travel form your desk to the floor in the longest time.
Rules:
You can only use paper and sticky tape.
You can not touch the marble once it has been released.
Your marble MUST reach the floor.
Marks:
You will be ranked in time order.
Video