Relative Motion
Physics ⇒ Mechanics
Relative Motion starts at 9 and continues till grade 12.
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See sample questions for grade 11
A bird flies at 8 m/s north relative to the air. If the wind blows at 6 m/s east, what is the bird's speed relative to the ground?
A boat can travel at 10 m/s in still water. If the river flows at 3 m/s, what is the velocity of the boat relative to the ground when it moves downstream?
A man rows a boat at 5 km/h in still water. If the river flows at 3 km/h, what is the minimum time required to cross a river 600 m wide, assuming he rows perpendicular to the current?
A person walks at 3 m/s on a moving walkway at 2 m/s in the same direction. What is the person's speed relative to the ground?
A person walks north at 4 km/h on a train moving east at 12 km/h. What is the magnitude of the person's velocity relative to the ground?
A plane flies at 200 km/h north relative to the air. If the wind blows at 50 km/h east, what is the plane's velocity relative to the ground?
A swimmer swims at 2 m/s in still water. If the river flows at 1.5 m/s perpendicular to the swimmer's direction, what is the resultant velocity of the swimmer relative to the ground?
Define relative velocity.
Describe how the concept of relative motion applies to a person walking inside a moving train.
Describe the difference between absolute and relative velocity.
Explain why passengers in a moving bus feel as if they are thrown forward when the bus suddenly stops.
Explain why the concept of relative motion is important in navigation.
Explain why two people sitting in the same moving car have zero relative velocity with respect to each other.
If a car moves at 25 m/s and a truck moves at 15 m/s in the same direction, what is the velocity of the car relative to the truck?
If a cyclist moves at 12 m/s west and the wind blows at 5 m/s east, what is the velocity of the cyclist relative to the wind?
If a person walks at 4 km/h west on a train moving at 60 km/h east, what is the person's velocity relative to the ground?
If a swimmer swims at 3 m/s across a river flowing at 4 m/s, what is the resultant velocity of the swimmer relative to the ground?
If a train moves east at 40 km/h and a person walks west inside the train at 5 km/h, what is the velocity of the person relative to the ground?
If object A moves at 20 m/s east and object B moves at 15 m/s west, what is the velocity of A relative to B?
If two cars move in the same direction with velocities 30 m/s and 20 m/s respectively, what is the velocity of the first car relative to the second?
