How does speed change as something falls?

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Presentation transcript:

How does speed change as something falls? Falling objects How does speed change as something falls? Starter: What speed did this man reached when he sky dived from outer space?! What else happened on his journey?

His Max Speed Max velocity: 833.9mph http://www.bbc.co.uk/news/science-environment-19943590

Freefalling objects Watch the video and prepare to answer some questions. Use animations to support

Motion of falling objects Q: why do you see this pattern? Speeding up Task: describe in terms of forces why a free falling object reaches a steady speed. (4 marks) Freefall – a falling ball gets steadily faster as it falls. Kenneth Eward/Biografx/Science Photo Library Steady speed Apply Newtons 1st Law

Velocity-time graph for terminal velocity… Parachute opens – diver slows down Velocity Speed increases… Terminal velocity reached… Diver hits the ground New, lower terminal velocity reached Time 04/12/2018

Can you explain this in terms of forces? Parachute opens – air resistance increases. Velocity Gravity bigger than air resistance. Air resistance equals gravity Diver hits the ground New, lower terminal velocity reached as air resistance and gravity balance. Time 04/12/2018

Task – complete the practise questions. Revision time. Choose 1 topic from p4 so far and make a poster about it, then produce a set of questions where the answers are found in the poster.

Mini Test Time Do not do question 4a.