1. You are traveling in a car going at a constant speed of 100 km/hr down a long

Question

1. You are traveling in a car going at a constant speed of 100 km/hr down a long, straight highway. You pass another car going in the same direction which is traveling at a constant speed of 80 km/hr. As measured from your car

Explanation / Answer

1. Acceleration of both the cars will be zero irrespective of the viewer/reference point. The cars will seem to go back or go front with a constant speed. so no acceleration. 2. a)The magnitude of force applied by me is equal to the magnitude of the reaction force of the box and both are equal to the frictional force between box and ground and me and ground. b)Same as (a) : The magnitude of force applied by me is equal to the magnitude of the reaction force of the box and both are equal to the frictional force between box and ground and me and ground. c) The magnitude of reaction force of the box is still equal to the magnitude of force applied by me, and both will be more than the frictional force applied on the wheels. Hence the movement. 3. (Force-friction)/mass = acc =>2-f/0.5 = 3.5 =>f = 0.25 N in the opposite direction of the force applied. 4. Accelaration = v2/r (radius of curve) this accelaration is provided by the frictional force applied to the car.(Second Law) So the car is under constant accelaration which is needed to change its direction continuously. Thus the first law is applied here.

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