1. Projectile motion

2. Starter Watch the video...
Why can the golf ball be described as a projectile?
What is the shape that the balls path creates?

3. Learning objectives Explain what a projectile is.
Explain the behaviour of projectiles as they move.
Use the equations of motion for an object projected horizontally above the Earth’s surface.

4. Success criteria
Produce a labelled diagram showing the key features of a projectiles motion. (Grade C)
Calculate different values for a projectiles motion using equations of motion. (Grade A)

5. Projectiles – key facts
A projectile is an object which moves through the Earth’s gravitational field.
Projectiles which are thrown horizontally or at an angle to the ground follow a curved parabolic path, called the trajectory.
The sideways motion of a projectile has no effect on its downwards motion
When performing calculations treat the vertical and horizontal motions as two separate ones

6. Demo / experiment
Ruler and ball experiment
Video if required

7. Look at page 183 of the text book old course
Sketch figure 3 and annotate it to describe:
How far the ball travels horizontally in a given time.
How far the balls fall each second in relation to each other.
How the distance the balls fall each second changes (why is this?)

8. Newton’s projectile
Page old course

9. Calculations on projectiles

10. Projectile Motion
Aha! If I let go of the branch when he fires his gun I’ll be safe because the bullet will go above me…

11. Question – how long did this take and how fast was the bullet?
Projectile Motion
1.5m
Question – how long did this take and how fast was the bullet?
50m
Use s = ut + ½at2 vertically to find the time
Then use speed = distance / time horizontally to get the speed

12. Monkey_and_hunter_classroom.mp4
Look at the example of the thrown dart on page 183.
Monkey_and_hunter_classroom.mp4

13. Foundation: 1. Answer Q3 and 4 page 183 2
Foundation: 1. Answer Q3 and 4 page Sketch and explain Newton’s projectile Higher: Try the questions on the projectiles worksheet.
v = u + at v2 = u2 + 2as
s =(u + v)t s = ut + ½at2 2

14. Answers Foundation: 10 m/s2 vertically downwards a) 15 m/ b) i 20 m
ii 80 m; time doubles but distance fallen is four times bigger

15. Answers Higher: a. t = 10 b. distance = 1500m
2. using speed = distance/time t = 0.5
Using s = ut + ½at2 s = 1.25m
3. a. 0.4s b. 5m/s
4. a. 3s b. 30m/s c. 30m/s d. 90m
5. a. 3s b. 30m/s c. 15m/s d. 45m
s m
s m/s

16. Learning objectives Explain what a projectile is.
Explain the behaviour of projectiles as they move.
Use the equations of motion for an object projected horizontally above the Earth’s surface.

17. Success criteria
Produce a labelled diagram showing the key features of a projectiles motion. (Grade C)
Calculate different values for a projectiles motion using equations of motion. (Grade A)

18. Plenary Write definitions for the following key words: Projectile
Trajectory
Parabolic