PHYSICS – CH 8.1 DESCRIBING MOTION

PAGE 250

USEFUL LINKS

1. Link to Yr 10 Physics Wiki

2. BBC Bitesize - Displacement, Velocity, Acceleration and Force

3. PhET – Physics Simulations

4. Sheep Reaction Time Game

5. Displaying Motion Graphs Wisc-online

DISTANCE AND DISPLACEMENT

• Distance a measurement of the total path that an object travels – includes twists and turns – does not include a specified direction.

• Displacement a straight line measurement of the distance separating and object from where it started to where it finished – includes a specified direction.

• Scalar quantity a quantity such as ‘distance or time’ that has size but not a direction.

• Vector quantity a quantity, such as ‘displacement or velocity’ that has both size and direction.

Copy the diagrams then play the drag and drop

SPEED AND VELOCITY

• Speed = distance/time (scalar)

s = d/t

• Velocity = displacement/time (vector)

v = d/t

• Speed the rate of change of distance (scalar)

• Velocity the rate of change of displacement (vector)

• Reaction time the length of time it takes a driver to respond to a hazard/emergency

• Reaction distance the distance moved while reacting to a hazard/emergency

• Instantaneous speed the speed of an object at a particular time.

Read the paragraph then copy the topic and the conversion diagram

Reaction time - sheep game

Reaction time - sheep game

GRAPHING MOTION – DISTANCE/TIME GRAPHS

DISPLACEMENT/TIME GRAPHS

SPEED/TIME GRAPHS

REVIEW QUESTIONS

• Questions 1-18 pages 257-8

• Full sentences and diagrams where appropriate