Relative Motion
Physics ⇒ Mechanics
Relative Motion starts at 9 and continues till grade 12.
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See sample questions for grade 12
A bird flies at 10 m/s east with respect to air. The wind blows at 5 m/s north. What is the bird's velocity relative to the ground?
A boat heads directly across a river at 4 m/s. The river flows at 3 m/s. What is the direction of the boat's velocity relative to the ground?
A boat moves north at 5 m/s relative to the water, and the river flows east at 3 m/s. What is the magnitude of the boat's velocity relative to the ground?
A car moves at 20 m/s north and another at 15 m/s south. What is the velocity of the first car relative to the second?
A bird flies at 10 m/s east with respect to air. The wind blows at 5 m/s north. What is the bird's velocity relative to the ground?
A boat heads directly across a river at 4 m/s. The river flows at 3 m/s. What is the direction of the boat's velocity relative to the ground?
A boat moves north at 5 m/s relative to the water, and the river flows east at 3 m/s. What is the magnitude of the boat's velocity relative to the ground?
A car moves at 20 m/s north and another at 15 m/s south. What is the velocity of the first car relative to the second?
If a train moves at 80 km/h and a person walks at 5 km/h in the opposite direction inside the train, what is the person's velocity relative to the ground? (1) 75 km/h, (2) 85 km/h, (3) 80 km/h, (4) 5 km/h
If two objects move in opposite directions with equal speeds, what is their relative velocity? (1) Zero, (2) Double the speed, (3) Half the speed, (4) Same as individual speed
Relative motion problems are often solved using which mathematical method? (1) Vector addition, (2) Integration, (3) Differentiation, (4) Matrix multiplication
The concept of relative motion is based on which principle? (1) Inertia, (2) Relativity, (3) Conservation of energy, (4) Conservation of momentum
If two objects move at right angles to each other, their relative velocity is found using the ________ theorem.
Relative motion is a consequence of the fact that all motion is ________.
Relative velocity is always measured with respect to a ________.
The magnitude of the relative velocity between two objects moving in the same direction is the ________ of their speeds.
Is it possible for two objects to have zero relative velocity even if both are moving? (Yes/No)
True or False: Relative velocity can be greater than the velocity of either object.
True or False: The laws of physics are the same in all inertial reference frames.
True or False: The velocity of an object is always the same in all reference frames.
