Y2_T4_LSN_Quiz discussion

• Science
• Middelbare school
• havo, vwo
• Leerjaar 2

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Everything else in your bag

Topic 4

Moving in the world

Plan for today

• Discussion Quiz T4.1-4.3 

Discussion Quiz T4.1-4.3

All pen/pencils in the bags please

Only your macbook allowed (with LessonUp open)

I will hand out your tests

Question 1

A space shuttle carrying a moon rover and three astronauts is travelling from earth to the moon. Their mission is to collect more data on the types of molecules that are present on the moon.

Calculate the Fg of the space shuttle with a mass of 2,050,000 kg. [1p]

Answer: Fg = 9.81 x 2 050 000 = 20 110 500 N

Question 2

Draw the forces acting on the space shuttle as it is standing still on the launch pad. Use the image on the worksheet for this and include the direction, magnitude and point of application in your answer. Use a scale of 1 cm = 5,000,000 N. [2p]

Answer:

20 110 500/5 000 000 = 4.02 cm

1p: Drawing of gravity →4 cm down, 

point of application in the middle of the shuttle

1p: Drawing of support force → 4 cm up, 

point of application on the ground

Fn

Fg

Question 3

When the space shuttle launches there are now different forces at work. List the forces acting on the space shuttle during the launch. [2p]

Answer:

1p: Applied force from the engines

1p: Air resistance

Question 4

During the launch the acceleration of the space shuttle is 24 m/s2. It takes 48 seconds for the space shuttle to reach a constant velocity. What is the velocity at that time in km/h? Round your answer to a whole number. [2p]

Answer:

1p: 24m/s2 x 48 seconds = 1152 m/s

1p: 1152 x 3.6 =4147 km/h (round to whole number! Or -½ pt)

Question 5

Explain how the resultant force has changed during the launch (before takeoff, during acceleration, and after reaching a constant velocity). [2p]

Answer:

1p: Before takeoff Fres is 0, then during the acceleration Fres is positive,

1p: after reaching a constant velocity Fres is again 0. 

Question 6

It takes the shuttle 71 hours and 45 minutes to reach the moon, which is a total distance of 386,400 km. Calculate the average speed in km/h of the space shuttle during its trip to the moon. Round your answer to a whole number. [2p]

Answer:

1p: 71 hours 45 mins = 71.75 hours

1p: 386,400/71.75 = 5385 km/h (round to whole number! Or -½ pt)

Question 7

After landing, the astronauts deploy the rover to travel across the surface of the moon. The rover’s job is to collect materials that the astronauts can test. 

On the worksheet you can find the different forces acting 

on the rover. Use the diagram to calculate the resultant 

force and draw this in the diagram. [3p]

Answer:

1p: measurement/calculation of the blue and yellow arrow

1p: Fres = 90 - 66 = 24 N

1p: Line 2 cm to the right

7.5 cm = 90N

5.5 cm = 66N

Fres

Question 8

Is the speed of the rover changing? If so, explain in what way? [1p]

Answer:

The resultant force is >0 in the direction of the rovers motion → accelerating

Question 9

The rover drives off a cliff and falls to the ground. The moment it drives off the cliff the friction and normal force are not present anymore. Draw the new resultant force on the diagram, then use the scale to calculate the size. [2p]

Answer:

1p: Fres :

1p: Line 8.3 cm diagonal

√​90​2​​+42​2​​​​​=99,3N

7.5 cm = 90N

3.5cm = 42N

Fres

Question 10a

On the map you can see the path the rover travelled. Use the information on this map to create the s,t-diagram that shows how far the rover is from the starting point. 

Use your ruler to measure the distances directly from the start to each point then fill them in on the table on the worksheet. [1p]

Answer:

Distance (in M) from start	Time
37m	20s
102m	135s
124m	160s
3m	230s

Question 10b

Fill in the points 

from the table on 

the empty diagram 

on your worksheet to 

create the s,t-diagram. 

(use 1 space = 10 m and

 1 space = 10 sec) [2p]

Answer:

1p: Filling in points on 

graph and making a line

1p: Correct axes and using 

the scale that's given

Time in seconds

o

10

20

120

ect

ect

10

20

240

130

Question 11

While the astronauts are out on a moon walk they come across a strange creature. They have discovered an alien! They record as much information on the creature as they can, including putting it on a Newton scale. The scale records a gravitational force of 8.6 N. The gravitational pull of the moon is 1.6N/kg. What would the gravitational force on this alien be if it was on earth? Round your answer to a whole Newton. [2p]

Answer:

1p: 8.6/1.6 = 5.375 kg

1p: 5.375 x 9.81 = 52.7 → 53N

Question 12

As the shuttle is returning to earth it first travels at a constant speed but in the last minutes of its journey the shuttle adjusts its speed for a safe landing. This can be seen in the v,t-diagram shown here. Calculate the acceleration of the shuttle as it completes its landing. [2p]

Answer:

1p: 7km  = 7000m

1p: -7000m/(3.5 x 60s) = -33.33m/s2

Bonus

BONUS: The distance covered by the shuttle can be determined by calculating the area under the v,t-diagram. Calculate the distance covered by the shuttle in the last 10 minutes.

Answer:

1/2p:   7x(6.5x60)=2730km

1p:      7x(3.5x60)x0.5=735km

1p:      2730+735=3645km

Homework

• Finish homework for 4.4 and 4.5 
• Prepare questions for the last lesson!