Forward, backward, lateral movement in Drone Programming - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the final position of the drone?

The drone starts at position (0, 0) facing north. It executes these commands in order:

1. Move forward 5 meters
2. Move right (lateral) 3 meters
3. Move backward 2 meters

What is the drone's final position (x, y)?

Drone Programming

position = [0, 0]
# Facing north means y increases when moving forward
position[1] += 5  # forward 5
position[0] += 3  # right 3 (lateral)
position[1] -= 2  # backward 2
print(tuple(position))

A (3, 7)

B (5, 1)

C (3, 3)

D (2, 3)

💡 Hint

Remember: forward/backward affect y-axis, lateral movement affects x-axis.

Starting at (0,0), moving forward 5 increases y to 5. Moving right 3 increases x to 3. Moving backward 2 decreases y to 3. Final position is (3, 3).

🧠 Conceptual

intermediate

Which command moves the drone laterally to the left?

The drone is facing north. Which command moves it 4 meters to the left (lateral movement)?

A Move forward 4 meters

B Move backward 4 meters

C Move right 4 meters

D Move left 4 meters

💡 Hint

Lateral movement means side to side, not forward or backward.

Moving left 4 meters moves the drone laterally to the left relative to its facing direction.

🔧 Debug

advanced

Identify the error in the drone movement code

The drone is facing east. The code below is supposed to move the drone forward 6 meters, then left 2 meters. What error will occur?

Drone Programming

position = [0, 0]
# Facing east means x increases when moving forward
position[0] += 6
position[1] += 2  # move left
print(tuple(position))

A No error, output is (6, 2)

B SyntaxError due to missing colon

C TypeError because position is not a list

D Logical error: moving left should increase y, not decrease

💡 Hint

Check how coordinates change when facing east.

Facing east, moving forward increases x. Moving left means moving north, increasing y since y axis increases north. The code correctly increases y by 2. No syntax or type errors occur.

📝 Syntax

advanced

Which option causes a syntax error in drone movement commands?

Which code snippet will cause a syntax error when moving the drone forward 3 meters?

A position[1] + = 3

B position[1] += 3

C position[1] = position[1] + 3

D position[1] +=3

💡 Hint

Look carefully at the spacing in the operators.

Option A has a space between '+' and '=', which is invalid syntax in Python.

🚀 Application

expert

Calculate total distance moved laterally

A drone executes these lateral movements in order: right 5 meters, left 3 meters, right 2 meters, left 4 meters. What is the total lateral distance from the starting point?

A 2 meters

B 0 meters

C 10 meters

D 4 meters

💡 Hint

Sum right movements and subtract left movements to find net lateral distance.

Total right = 5 + 2 = 7 meters; total left = 3 + 4 = 7 meters; net lateral distance = 7 - 7 = 0 meters. But since left and right cancel, the drone ends up at starting lateral position, so distance is 0 meters.

Practice

1. Which command moves the drone forward by 5 meters?

easy

A. move_right(5)

B. move_forward(5)

C. move_left(5)

D. move_backward(5)

Solution

1. Step 1: Understand the direction commands

   The command move_forward(distance) moves the drone forward by the given distance.

2. Step 2: Match the distance and direction

   Since we want to move forward by 5 meters, move_forward(5) is the correct command.

3. Final Answer:

   move_forward(5) -> Option B

4. Quick Check:

   Forward move = move_forward(5) [OK]

Hint: Forward means move_forward with distance [OK]

Common Mistakes:

• Confusing forward with backward commands
• Using lateral move commands instead of forward
• Mixing up distance units

2. Which of these is the correct syntax to move the drone 3 meters to the left?

easy

A. move_left(3)

B. moveLeft(3)

C. move_left 3

D. move_left(three)

Solution

1. Step 1: Identify correct function syntax

   The correct syntax uses the function name followed by parentheses enclosing the distance number.

2. Step 2: Check parameter type and spelling

   move_left(3) uses move_left(3) which is correct. moveLeft(3) uses camelCase which is incorrect here. move_left 3 misses parentheses. move_left(three) uses a word instead of a number.

3. Final Answer:

   move_left(3) -> Option A

4. Quick Check:

   Function call with number in parentheses [OK]

Hint: Use function_name(number) with parentheses and digits [OK]

Common Mistakes:

• Omitting parentheses in function call
• Using wrong case in function name
• Passing string instead of number

3. What is the final position of the drone after these commands starting at (0,0)?

move_forward(4)
move_right(3)
move_backward(2)
move_left(1)

medium

A. (3, 4)

B. (3, 2)

C. (2, 2)

D. (2, 3)

Solution

1. Step 1: Track vertical (forward/backward) movement

   Start at (0,0). move_forward(4) moves y from 0 to 4. move_backward(2) moves y from 4 to 2.

2. Step 2: Track horizontal (left/right) movement

   move_right(3) moves x from 0 to 3. move_left(1) moves x from 3 to 2.

3. Step 3: Calculate final coordinates

   Final position is (2, 2).

4. Final Answer:

   (2, 2) -> Option C

5. Quick Check:

   Horizontal = 3-1=2, Vertical = 4-2=2 [OK]

Hint: Add forward/backward to Y, left/right to X [OK]

Common Mistakes:

• Mixing X and Y axes
• Forgetting backward subtracts from Y
• Ignoring left movement subtracts from X

4. Identify the error in this drone movement code:

move_forward(5)
move_left(2)
move_backward()
move_right(3)

medium

A. Missing distance argument in move_backward()

B. move_left should be move_right

C. move_forward cannot be called first

D. move_right has wrong syntax

Solution

1. Step 1: Check each function call for required arguments

   All move commands require a distance number. move_backward() is missing the distance argument.

2. Step 2: Verify other commands

   move_left(2), move_forward(5), and move_right(3) all have correct syntax and arguments.

3. Final Answer:

   Missing distance argument in move_backward() -> Option A

4. Quick Check:

   Functions need distance parameter [OK]

Hint: All move commands need a number inside parentheses [OK]

Common Mistakes:

• Calling move functions without distance
• Confusing left and right commands
• Assuming order of commands matters for syntax

5. You want the drone to move in a square path of 4 meters each side starting at (0,0). Which sequence of commands achieves this?

hard

A. move_right(4)
move_forward(4)
move_left(4)
move_forward(4)

B. move_forward(4)
move_left(4)
move_backward(4)
move_left(4)

C. move_forward(4)
move_right(4)
move_right(4)
move_backward(4)

D. move_forward(4)
move_right(4)
move_backward(4)
move_left(4)

Solution

1. Step 1: Understand square path directions

   A square path means moving forward, then right, then backward, then left, each by the same distance.

2. Step 2: Check each option's sequence

   move_forward(4) move_right(4) move_backward(4) move_left(4) follows forward, right, backward, left by 4 meters each, completing a square back to start.

3. Step 3: Verify final position

   After these moves, the drone returns to (0,0), confirming a square path.

4. Final Answer:

   move_forward(4) move_right(4) move_backward(4) move_left(4) -> Option D

5. Quick Check:

   Square path = forward, right, backward, left [OK]

Hint: Square path: forward, right, backward, left same distance [OK]

Common Mistakes:

• Mixing left and right order
• Not returning to start point
• Using different distances for sides