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18 questions
A parachutist of mass 75 kg jumps from a plane at a height of 4 000 m above sea level.
The parachutist falls through a distance of 2 400 m during the first 60 seconds. Calculate the average speed of the parachutist during this time.
20 ms^{-1}
40 ms^{-1}
67 ms^{-1}
80 ms^{-1}
Just after she jumps out of the plane (before the parachute opens). The relative forces will be
Balanced
Unbalanced
Just after she jumps out of the plane (before the parachute opens). The relative forces will be
Weight force is equal to the friction force
Friction force is constant
Weight force is greater that the friction force
Friction force is greater than the weight force
Just after she jumps out of the plane (before the parachute opens). The net force will be
zero
upward
downward
Just after she jumps out of the plane (before the parachute opens). The sky diver will have
a constant speed
a constant acceleration
a constant velocity
After the 60 seconds, the parachutist pulls the cord and opens her parachute.
Explain how the parachute reduces the speed of the parachutist when it is just opened.
The friction force decreases
The weight force decreases
The weight force increases
The friction force increases
The graph shows the vertical speed of a parachutist. At which point did they open the parachute?
A
B
C
D
If a skydiver changes from a vertical to a horizontal position during freefall:
His terminal speed would increase
His terminal speed would decrease
His terminal speed would stay the same
If this graph were to show a parachutist jumping from a plane, how would you describe the forces acting at point B.
His weight is bigger than air resistance
Air resistance is bigger than his weight.
His weight and air resistance are balanced.
When a parachute canopy is opened more drag is created because:
It has a large mass
It has a large surface area
It is travelling at terminal speed
The person is now vertical
The value for gravity on Earth is around _____ m/s^2
5
9.8
8.9
15
Weight is calculated by
mass X gravity
mass X velocity
acceleration X velocity
What is mass?
the amount of matter in an object
how heavy an object is
how fast an object falls
how big an object is
The weight of a girl with a mass of 40 kg is ___ N.
The weight of a cart with a mass of 150 kg is ___ N.
An astronaut weighing 588 N on earth notices that he weighs only 98 N on moon. His mass on moon is ___ kg.
60
50
100
58
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