5-FAC-03
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Contents
Outcomes
Specification References
- 1.5 interpret velocity-time graphs
- 1.6 determine acceleration from the gradient of a velocity-time graph
- 1.7 determine the distance travelled from the area between a velocity-time graph and the time axis.
- 1.16 describe the forces acting on falling objects and explain why falling objects reach a terminal velocity.
Starter
- Using The Journey again have the pupils use the last column of the table to work out the instantaneous speed at each step of the train journey. They should do this in groups so that they share out thea work between four. This should make this go a bit quicker. From this they make the connection between constant slope being constant speed and horizontal portions being zero speed. Hand out The Journey - sketching velocity-time graphs. This allows pupils to sketch the velocity time graph below the distance time graphs with the time scale in-line. They can use their calculations from earlier to help add values to the y-axis. You can spend time pointing out the key points (horizontal->zero gradient->zero speed, constant slope-> constant gradient-> constant speed, changing slope-> changing gradient-> changing speed-> acceleration, steeper slope-> larger gradient-> greater speed)
Main Body of Lesson
Plenary
- Sketch a velocity-time graph for a falling object. A person jumping out of a plane.
Sheet to do this with diagrams of a person to label forces on at each stage of the jump. This will show when the resultant force is greatest (at the beginning) and when it is balanced ( at terminal velocity both without the chute open and with it open. This also points out that the weight vector does not change but the air resistance vector changes in magnitude according to the speed or if the parachute is open.
Homework
Additional Information
Resources Required
Textbook References
- None
Website References
- None
Skills Addressed
Safety/Hazards
Risk Assessment
Notes
- None
