Terminal Velocity

Terminal velocity In this study of a skydiver you will:- interpret velocity-time graphs work out acceleration and deceleration calculate the distance travelled

Velocity(m/s) Time(s) A B 48 C D E 50 Terminal velocity deceleration acceleration Constant slower speed C D deceleration E 50 Time(s)

Velocity(m/s) Time(s) 4 2 3 48 36 5 1 24 8 7 12 6 9 10 20 30 40 50 1 Where is the skydiver is accelerating 2 Where is the skydiver slowing down (decelerating) and 3 Where does the skydiver reach terminal velocity? 4 Where does the skydiver open her parachute? 5Label the point when the ground is reached Velocity(m/s) 4 2 3 48 36 5 1 24 8 7 12 6 9 Time(s) 10 20 30 40 50

Velocity(m/s) Time(s) 4 2 3 48 36 5 1 24 8 7 12 6 9 10 20 30 40 50 1 Where is the skydiver is accelerating 1 2 Where is the skydiver slowing down (decelerating) 5 and 9 3 Where does the skydiver reach terminal velocity? 2 4 Where does the skydiver open her parachute? 4 5Label the point when the ground is reached 8 Velocity(m/s) 4 2 3 48 36 5 1 24 8 7 12 6 9 Time(s) 10 20 30 40 50

6. Initially the person speeds up from 0 to 48m/s in 5seconds. Work out the acceleration 7. The person then falls at a terminal velocity of 48m/s for 24s. How far has he fallen at this speed? 8. 48m/s to 12m/s in 6s. What deceleration is this? Acceleration = = Distance fallen = X = Deceleration = =

9. 12m/s for 13s. How far has he fallen at this speed? 10. 12m/s to 0m/s in 2s. What deceleration is this? Distance fallen = X = Deceleration = =

6. Initially the person speeds up from 0 to 48m/s in 5seconds. Work out the acceleration 7. The person then falls at a terminal velocity of 48m/s for 24s. How far has he fallen at this speed? 8. 48m/s to 12m/s in 6s. What deceleration is this? 9. 12m/s for 13s. How far has he fallen at this speed? 10. 12m/s to 0m/s in 2s. What deceleration is this? (for extra help use action buttons below) (48 – 0)/5 = 9.6m/s 2 48 X 24 = 1152m (12-48)/6 = - 6 m/s 2 12 X 13 = 156 m (0-12)/2 = - 6 m/s 2

Deceleration is when an object down. Key points to remember Deceleration is when an object down. Use the formula for calculating acceleration but remember that the answer will be for a decelerating object. Distance travelled = under the graph velocity time The area under a -time graph is the travelled by the object

Deceleration is when an object slows down. Key points to remember Deceleration is when an object slows down. Use the formula for calculating acceleration but remember that the answer will be negative for a decelerating object. Distance travelled = area under the graph velocity time The area under a velocity-time graph is the distance travelled by the object

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