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How the parachute works
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Salma Mostafa
How the parachute works:
What are the affecting forces?
How do the parachute materials affect the air resistance?
What causes the parachute to drop?
What is the best weather condition for paragliding?
What happens when the design and load of the parachute change?
Do you think the length and weight of the liners are important factors to consider?
What is PLF standing for?
What are the affecting forces?
How do the parachute materials affect the air resistance?
What causes the parachute to drop?
What is the best weather condition for paragliding?
What happens when the design and load of the parachute change?
Do you think the length and weight of the liners are important factors to consider?
What is PLF standing for?
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How the parachute works?
What are the affecting forces?
Are the forces acting on the parachute contact or non contact forces?
What is the relation between the gravity and the drag force?
How do the parachute materials affect the air resistance?
Hypothesis:
The parachute which is made of handkerchief will drop faster than the one made of plastic bag.
Steps :
1-Cut a square from the plastic bag and a square from the paper that is the same size as the handkerchief.
2-Cut twelve 6”pieces of string.
3-Tie one piece of string to each corner of the plastic square.
4-Tie one piece of string to each corner of the handkerchief.
5-Punch a hole in each corner of the paper and tie a piece of string through each hole.
6-Attach a ball of clay to the bottom of the plastic square and
handkerchief. Use the dangling string pieces for the attachment.
7-Stand on a chair or ladder.
8-Drop each parachute at the same height from the elevated
location.
9-Have another person record the time from the moment the
parachute is release until it hits the ground.
Observation:
The parachute which is made from handkerchief will fall to the
ground faster than the parachute which is made from plastic bag.
Conclusion:
Our hypothesis is accepted.The fabric has less air resistance than the plastic bag
What causes the parachute to drop?
Does the height of the parachute affects the time it takes to drop?
Does the load carried by the parachute affects it's falling?
What is the best weather condition for paragliding?
What happens when the design and load of the parachute change?
what is the relation between the surface area, air force and the parachute drag?
Hypothesis:
If I dropped different sizes of parachute, keeping other variables constant, The big ones will fall slower than the smaller ones.(Effect of surface area on speed of falling)
Steps:
1-Each parachute will be made out of the garbage bag material, so first cut open the garbage bags to make a flat sheet of plastic.
2-You will make a series of four parachutes of different sizes, from large to small. Each parachute will be square in shape, so the four sides will each be of the same length.
3-Cut out each of the four differently sized parachutes from the garbage bag material
4-For each parachute, tie a knot in each of its four corners
5-Cut 16 pieces of string, making each be 40 cm long
6-For each parachute, tie one end of each piece of string around one of the four knots, positioning the string right above the knot
7-For each parachute, hold the center of the plastic sheet in one hand and pull all strings with the other to collect them. Tie the free end of the strings together with an overhand knot
8-Attach 1 washer to each bundle of strings with a twist tie. Alternatively, if you are u
sing pennies and tape instead, tape 2 pennies to each bundle of string.
9-In your lab notebook, make a data table consists of: parachute #, trial 1,2,3 (seconds),average time(Seconds)
Observation:
The parachute that has bigger size will fall slower than slow ones.
Result:
The hypothesis is confirmed. The surface area has a recognizable effect on speed of
falling.
Do you think the length and weight of the liners are important factors to consider?
What is PLF standing for?
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