Physics Kinematics: Motion in a Straight Line - Relative Velocity in 2D

What is a frame of reference in the context of relative motion?

• A coordinate system for observations

• A moving object

• A type of vector

• A fixed point in space

Why might two observers in different inertial frames measure different velocities for the same object?

• Because of the object's mass

• Due to the relative motion of the frames

• Because of the object's shape

• Due to the color of the object

In the scenario with Markio and Princess Lotus, what method is used to calculate the relative velocity?

• Matrix transformation

• Scalar multiplication

• Graphical vector addition

• Algebraic vector subtraction

What is the bearing of Princess Lotus's velocity relative to Markio after calculation?

• 245 degrees

• 120 degrees

• 340 degrees

• 102.3 degrees

What is the scale used in the graphical method for Vector Man's velocity problem?

• 1 cm = 10 m/s

• 1 cm = 5 m/s

• 1 cm = 2 m/s

• 1 cm = 1 m/s

What is the resultant velocity of Vector Man relative to the ground?

• 30 m/s at 340 degrees

• 10 m/s northeast

• 35.4 m/s at 355 degrees

• 20 m/s west of north

In Ian's river crossing problem, what is the direction Ian should swim to reach the platform directly?

• East

• North

• 159.6 degrees

• 245 degrees

How long does it take Ian to cross the river if he swims at the correct angle?

• 5 minutes

• 1 minute and 30 seconds

• 3 minutes and 35.5 seconds

• 2 minutes

What is the key takeaway about adding perpendicular vectors?

• They are ignored in calculations

• They are subtracted directly

• They require trigonometry and Pythagoras' theorem

• They are added like numbers

What is the main concept emphasized in the conclusion of the lesson?

• All motion is relative

• Frames of reference are irrelevant

• Vector addition is unnecessary

• All motion is absolute