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SpeedingUp

about speeding up

QuestionAnswer
In the first three seconds Mary’s acceleration is constant. Use the slope of the graph to calculate its size in metres per second squared.
What distance does Mary fall in the first three seconds?
As Mary falls she notices that her acceleration decreases until she reaches terminal velocity. At what time has she reached terminal velocity?
Explain why you chose this time for when Mary reaches terminal velocity.
In a distance, time graph down is positive so to get to terminal velocity you would have to have a constant slope.
Using Newton’s Second Law, explain why Mary must have no net force acting on her when she is falling at a constant velocity?
Mary has a mass of 65 kg. Calculate the size of the force of gravity acting on her as she falls.
On the diagram of Mary sketch vector arrows to represent the forces on her when she is falling at terminal velocity.
Deduce the size of the air resistance force acting on Mary when she falls at terminal velocity.
!need to do!
What is the minimum work that the engine of the plane has to do to reach this height?
In reality, the engine has to do more work than this for the plane to reach 5000m. Explain why this is the case.
If the plane is flying at a speed of 60 ms-1, use the formula Ek = ½mv2 to calculate how much kinetic energy it has.
If the plane were to have a catastrophic engine failure and ‘fall out of the sky’ while 4 flying at 60 ms-1, ignoring air resistance, how fast would it be going just as it hit the ground?
On another trip a plane does 2.40 x 107 J of work to reach the jump height. It takes 10 minutes to get to this height. What power must the plane engine have to do this?
At sea level air pressure has a value of 1.01 x 105. Use the formula P = F/A to obtain units for pressure.
When Mary is at 5000m air pressure has dropped to 5.00 x 105 Pa. What sized force will a 1 cm x 1 cm area of Mary’s skin feel due to the air?
Created by: callum.macmillan