1. Quick Questions What is an effort arm? (1)
Draw the third class lever at the elbow (1)
Draw a free body diagram for a sprinter accelerating off the blocks (4)
Explain how you can apply Newton’s 2nd law to maximise speed off the blocks (2)
Describe 2 ways that a rugby player can maximise stability in a scrum (2)

2. Biomechanical Principles – Linear Motion
Biomechanics
Biomechanical Principles – Linear Motion

3. Some: Interpret data for linear motion
Learning Objectives
Learning Objective:
Understand how linear motion is created, calculate measurements and plot and interpret graphs of linear motion.
- distance, displacement, speed, velocity, acceleration, deceleration, distance/time graphs, speed/time graphs/ velocity/time graphs
Learning Outcomes:
All: Describe how linear motion is created, and calculate each of the measurements
Most: Apply your knowledge of linear motion in a variety of sporting examples
Some: Interpret data for linear motion

4. Key Terms Use a book to define / describe each of these key terms
Linear motion
Direct force
Centre of mass
Distance
Displacement
Speed
Velocity
Acceleration
Deceleration
Distance/time graph
Speed/time graph
Velocity/time graph

6. Direct Force
Direct force occurs when a force is applied through the centre of the object, causing linear motion.

7. Centre of Mass
The point at which all forces are equal

8. Distance / Displacement

9. Distance / Displacement

10. Speed / Velocity Speed = Distance / Time (m/s)
Velocity = Displacement / Time (m/s)
2723 / 419 = 6.51 m/s
3637 / 551 = 6.60 m/s

11. Speed / Velocity How fast am I? I run 800m in 3minutes
I cycle 1.5km in 2.5minutes
I row 400m in 1minute 30 seconds
I run a marathon in 4.75 hours
1 run 100m in 11.6 seconds

13. Calculating Acceleration
Final velocity – initial velocity time
Vf – Vi
time
How quickly are these accelerating?
I covered the first 10m of a sprint in 0.7s
A car went from 30mph to 50mph in 5 seconds
A swimmer completed the first 10m of a race in 2s then the next 20m in 3 seconds.

14. Distance/Time Graph Constant speed Deceleration Stationary
Acceleration

15. Speed/Time Graph
Stationary
Steady speed
Acceleration
Deceleration

16. Velocity/Time Graph

17. Velocity/Time Graph

18. Quick Questions How is linear motion created? (1)
How do you calculate acceleration? (1)
Draw a velocity/time graph to show the speed of a tennis ball when it served by player A, then returned into the net by player B (4)
How fast does Usain Bolt run ? (2) (9.58s)
Draw a speed/time graph showing constant speed (1)
Draw a distance/time graph showing constant speed (1)