Hover condition (thrust = weight) in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the drone is hovering by comparing thrust and weight.

Drone Programming

if thrust [1] weight:
    print("Hovering")

Drag options to blanks, or click blank then click option'

A<

B>

C!=

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' or '<' instead of '==' causes wrong hover detection.

The hover condition is when thrust equals weight, so we use the '==' operator.

2fill in blank

medium

Complete the code to calculate the net force on the drone.

Drone Programming

net_force = thrust [1] weight

Drag options to blanks, or click blank then click option'

A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Adding thrust and weight instead of subtracting.

Net force is thrust minus weight to see if the drone moves up or down.

3fill in blank

hard

Fix the error in the condition to detect if the drone is ascending.

Drone Programming

if thrust [1] weight:
    print("Ascending")

Drag options to blanks, or click blank then click option'

A>

B!=

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' or '==' instead of '>'.

The drone ascends when thrust is greater than weight.

4fill in blank

hard

Fill both blanks to create a dictionary of drone states based on thrust and weight.

Drone Programming

states = {"hover": thrust [1] weight, "ascend": thrust [2] weight}

Drag options to blanks, or click blank then click option'

A==

B>

C<

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the operators for hover and ascend.

Hover is when thrust equals weight, ascend is when thrust is greater than weight.

5fill in blank

hard

Fill all three blanks to create a dictionary with hover, ascend, and descend states.

Drone Programming

states = {"hover": thrust [1] weight, "ascend": thrust [2] weight, "descend": thrust [3] weight}

Drag options to blanks, or click blank then click option'

A==

B>

C<

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong operators for the states.

Hover when thrust equals weight, ascend when thrust is greater, descend when thrust is less.

Practice

1. What does the hover condition thrust == weight mean for a drone?

easy

A. The drone's battery is fully charged.

B. The drone will start moving upward quickly.

C. The drone will fall down immediately.

D. The drone stays steady in the air without moving up or down.

Solution

1. Step 1: Understand thrust and weight

   Thrust is the upward force from the drone's propellers, and weight is the downward force due to gravity.

2. Step 2: Analyze the equality condition

   When thrust equals weight, the forces balance, so the drone neither rises nor falls.

3. Final Answer:

   The drone stays steady in the air without moving up or down. -> Option D

4. Quick Check:

   Hover condition means thrust = weight [OK]

Hint: Hover means forces balance: thrust equals weight [OK]

Common Mistakes:

• Thinking thrust > weight means hovering
• Confusing thrust with battery power
• Assuming thrust < weight means hovering

2. Which of the following is the correct way to check if thrust equals weight in drone programming?

easy

A. if thrust == weight:

B. if thrust != weight:

C. if thrust = weight:

D. if thrust => weight:

Solution

1. Step 1: Identify the comparison operator

   In programming, == checks if two values are equal, while = assigns a value.

2. Step 2: Choose the correct syntax

   To check equality, use if thrust == weight: which compares thrust and weight.

3. Final Answer:

   if thrust == weight: -> Option A

4. Quick Check:

   Use '==' for equality check [OK]

Hint: Use '==' to compare values, '=' is for assignment [OK]

Common Mistakes:

• Using single '=' instead of '==' for comparison
• Using '!=' which means not equal
• Using invalid operators like '=>'

3. What will be the output of this code snippet?

thrust = 10
weight = 10
if thrust == weight:
    print('Hovering')
else:
    print('Not hovering')

medium

A. Hovering

B. No output

C. SyntaxError

D. Not hovering

Solution

1. Step 1: Compare thrust and weight values

   Both thrust and weight are set to 10, so thrust == weight is True.

2. Step 2: Determine which branch runs

   Since the condition is True, the code prints 'Hovering'.

3. Final Answer:

   Hovering -> Option A

4. Quick Check:

   10 == 10 is True, so print 'Hovering' [OK]

Hint: Equal values trigger 'Hovering' print [OK]

Common Mistakes:

• Confusing assignment '=' with comparison '=='
• Expecting 'Not hovering' when values are equal
• Missing indentation causing syntax errors

4. Find the error in this code that checks hover condition:

if thrust = weight:
    print('Hovering')

medium

A. Missing colon ':' after if statement

B. Using '=' instead of '==' for comparison

C. Incorrect indentation of print statement

D. Variable names are invalid

Solution

1. Step 1: Check the if statement syntax

   The code uses = which assigns value, not compares values.

2. Step 2: Correct the operator for comparison

   Replace = with == to properly check if thrust equals weight.

3. Final Answer:

   Using '=' instead of '==' for comparison -> Option B

4. Quick Check:

   Use '==' to compare, '=' assigns [OK]

Hint: Use '==' in if conditions, '=' is assignment [OK]

Common Mistakes:

• Confusing '=' and '=='
• Ignoring missing colon errors
• Assuming indentation error instead of operator error

5. You want the drone to print 'Hovering' only when thrust equals weight, and 'Adjusting' otherwise. Which code correctly implements this?

thrust = 15
weight = 15
# Your code here

hard

A. if thrust = weight:
print('Hovering')
else:
print('Adjusting')

B. if thrust != weight:
print('Hovering')
else:
print('Adjusting')

C. if thrust == weight:
print('Hovering')
else:
print('Adjusting')

D. if thrust > weight:
print('Hovering')
else:
print('Adjusting')

Solution

1. Step 1: Use correct equality check

   The condition must use == to check if thrust equals weight.

2. Step 2: Use else for other cases

   If thrust is not equal to weight, print 'Adjusting' to indicate change needed.

3. Final Answer:

   if thrust == weight: print('Hovering') else: print('Adjusting') -> Option C

4. Quick Check:

   Use '==' for equality, else for other cases [OK]

Hint: Use if thrust == weight else for other cases [OK]

Common Mistakes:

• Using '=' instead of '==' in if condition
• Reversing condition with '!='
• Using '>' which is not hover condition