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61 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
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
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.
Identify true statements:
The parachutist has just left the plane
Weight is increasing
There is no drag
Weight is constant
Deceleration
Identify true statements:
Drag is increasing
Velocity is increasing
There is no drag
Weight is increasing
Deceleration
Identify true statements:
Drag is increasing
Velocity is increasing
Terminal velocity
Acceleration
Maximum drag
Identify true statements:
The parachutist opens their parachute
Deceleration
Terminal velocity
Weight is increasing
Drag is constant
Identify true statements:
Drag is decreasing
Velocity is increasing
Drag is increasing
Velocity is decreasing
Weight is constant
Identify true statements:
Drag is increasing
Velocity is increasing
Terminal velocity
Acceleration
Drag is constant
Terminal velocity.
Select the force arrows that apply:
Select the description of motion from A - B.
Slowing down away from the origin
Speeding up away from the origin
Constant velocity away from the origin
Constant velocity towards the origin
What segment of the graph shows no motion, or standing still?
A - B
B - C
C - D
None
True or False: this graph shows several segments ALL with constant velocity.
True
False
Describe motion of C - D.
Constant velocity away from the origin
Slowing down away from the origin
Slowing down away from the origin and then slowing down towards the origin
Slowing down away from the origin and then speeding up towards from the origin
Describe the motion from B - C.
Standing still
Constant velocity of 60 m/min
Constant velocity of 0 m/min
Accelerating
What kind of line on a P-T graph would create the segment B - C on this V-T graph?
Straight, linear line
Horizontal line
Curved line
Wouldn't happen
Segment D - E would have come from what type of P-T graph line?
Straight, linear
Horizontal
Curved
Wouldn't happen
What does a horizontal line (not on the x-axis) mean on a V-T graph?
No movement
Constant velocity
Changing velocity
Change in direction
What is happening at 0 m/min in the middle of segment C - D?
Nothing is happening
Change in speed
Change in position
Change in direction
Which segment shows an object speeding up towards the origin?
A - B above the x-axis
C - D below the x-axis
C-D above the x-axis
D - E
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