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Terminal Velocity

GCSE P2
by

Carl Bater

on 17 October 2018

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Transcript of Terminal Velocity

Terminal Velocity
Task:Produce a guide as to why falling objects eventually reach a top speed. Use what you know about forces, the textbook provided and the frame below to help.
Panel 1: sketch a skydiver as they just step out of a plane, labeling forces and explaining why they fall
Panel 2: show the skydiver accelerating, explaining how the forces acting on them change as they speed up
Panel 3: the skydiver is now at their terminal velocity. explain why they cannot get any faster.
Panel 4: now show what happens to the forces and motion of the skydiver when they open their parachute
Panel 5: explain why the parachute slows them down to a safe steady speed.
Panel 6: last of all, explain why they stop when they come into contact with the ground.
Self Assessment...
1: Starting to fall
2: Accelerating.
3: Terminal Velocity
4: Open Parachute
5: New slow speed
6: Landing.
Weight
Air Resistance
The skydiver begins to fall. They are falling slowly to begin with, so air resistance is small. There is a large unbalanced force so their acceleration is large.
Weight
Air Resistance
The faster the skydiver falls, the bigger the air resistance becomes, making their acceleration smaller and smaller and smaller...
Weight
Air Resistance
Eventually the skydiver is falling so fast that the air resistance balances the weight. There is no resultant force, so no acceleration. The skydiver can not fall any faster.
Weight
Air Resistance
Opening a parachute makes the air resistance much bigger than the weight. This unbalanced force causes the skydiver to slow down very quickly.
Weight
Air Resistance
As the parachute slows the skydiver down, their air resistance decreases, until it balances with their weight again at a new lower terminal velocity.
When the skydiver lands, the ground pushes back up on them with a force large enough to bring them to rest.
Weight
Force from ground
1) How did Bond catch up with the bad guy? How/Why did this work?

2) How could the bad guy have avoided Bond reaching him? HINT: 2 methods...

3) Why do skydivers spread their arms and legs? Consider what would happen during the struggle...

4) Why could Jaws fall at a higher speed than Bond?

5) Explain in terms of forces and motion what happened when Bond opened his parachute.

6) Explain why Jaws flapping his arms would not work to slow him down.

7) Would Jaws survive the fall?

Terminal Velocity
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