Relative Motion

Realative Motion

Multiple Choice

A rhinoceros is moving west at a velocity of 1 m/s with a tickbird on its back. The tickbird walks east at a velocity of 0.25 m/s relative to the rhinoceros. At what velocity is the tickbird traveling with respect to the photographer?

• 1.25 m/s west

• 1.25 m/s east

• 0.75 m/s west

• 0.75 m/s east

Multiple Choice

A bus is traveling north at a speed of 90 kilometers per hour (km/hr). A motorcycle traveling north at a speed of 120 km/hr passes the bus.

Which describes what the bus's motion looks like to the driver of the motorcycle?

• The bus looks like it is moving south at 30 km/hr.

• The bus looks like it is moving north at 90 km/hr.

• The bus looks like it is moving north at 120 km/hr.

• The bus looks like it is moving south at 210 km/hr.

Multiple Choice

An airplane flies in a straight level line at constant speed as shown. A package is to be dropped from the plane so that it hits a target at point Q. Point P is directly over the target. When should the package be dropped?

• At a certain time before the plane reaches point P

• At the instant that the plane reaches point P

• Immediately after the plane passes point P

• Several seconds after the plane has passed point P

Multiple Choice

Two cars are moving in opposite directions as shown in the diagram below.

Using Car A as a frame of reference, what is the speed of Car B?

• 20 km/h

• 30 km/h

• 50 km/h

• 80 km/h