Question

Exercise 2.6 Can you assume that a car is not accelerating if its speedometer shows a constant, steady reading of 35 mph? Explain. Exercise 2.7 Can the velocity of an object be zero at the same time that that its acceleration is nonzero? Explain and give an example. Exercise 2.8 If you go around a curve at constant speed, is there acceleration associated with this motion? If there is, what is the direction of the acceleration vector? Exercise 2.9 Will the acceleration be the same when a car rounds a sharp curve at 65 mph as it is if it rounds a gentle curve at the same speed? Explain.

Answer 1

2. 6 Acceleration is defined as rate of change of velocity and here car is moving with constant velocity hence rate of change of velocity is zero or you can say that acceleration is zero

2.7 Yes it is possible that velocity of object become zero but it have non zero acceleration for example when we through ball upward then at top most point velocity of ball will be zero but it have non zero acceleration

2.8 Yes there will be acceleration and it's direction is toward the center of circle.

2.9 Sharp curve have larger acceleration because it have small radius