Need help with my science homework?
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I am in year 8 top science set but we have been having a supply teacher and I don't understand her very well so could you help me with this homework? Forces and Parachutes 1) a) Fill in the missing gaps in the sentences. b) Some of the words can be used more than once. Words: Constant Terminal Upward Unbalanced Increases Decreases Small Increase Weight Balanced Same Accelerate(s) Decelerate Large A The skydiver jumps out the plane and the downward force of her __________ pulls her down, her air resistance at the start is very __________ but soon she starts to __________. B As she accelerates the air resistance force__________ and acts in the opposite direction to her __________. C As she accelerates faster the air resistance force continues to __________ until eventually it is the __________ as her weight. She is now moving at a __________ speed and her weight is equal to the air resistance. Her speed is called her __________ velocity (She can not go any faster). The two forces are __________. D She opens her parachute. There is now a very __________ air resistance force so she starts to __________ (slow down). E As she decelerates the air resistance force on her parachute __________ until it is the __________ size as her weight. She is now again falling at a __________ speed but she has a new and slower __________ velocity. F On the ground her __________ is now equal to the __________ force from the ground, the forces are balanced. G Whenever the forces are unbalanced she __________.
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Answer:
A The skydiver jumps out the plane and the downward force of her _(weight)_ pulls her down, her air resistance at the start is very _(small)_ but soon she starts to _(accelerate)_. B As she accelerates the air resistance force_(increases)_ and acts in the opposite direction to her _(weight)_. C As she accelerates faster the air resistance force continues to _(increase)_ until eventually it is the _(same)_ as her weight. She is now moving at a _(constant)_ speed and her weight is equal to the air resistance. Her speed is called her _(terminal)_ velocity (She can not go any faster). The two forces are _(balanced)_. D She opens her parachute. There is now a very _(large)_ air resistance force so she starts to _(decelerate)_ (slow down). E As she decelerates the air resistance force on her parachute _(decreases)_ until it is the _(same)_ size as her weight. She is now again falling at a _(constant)_ speed but she has a new and slower _(terminal)_ velocity. F On the ground her _(weight)_ is now equal to the _(upward)_ force from the ground, the forces are balanced. G Whenever the forces are unbalanced she _(accelerates)_.
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Other answers
A= Weight, small, accelerate B= Increases, weight C= Increase, same, terminal, balanced D= Large, decelerate E= Decreases, same, constant, terminal F= Weight, upward G= Accelerates I don't think the question is actually worded particularly well and I would recommend running a google search on forces and air resistance (I think all of the answers i gave were correct but i can't be sure, good luck) :)
Alexander
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