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Chapter 4: Q4. (page 98)

If the acceleration of an object is zero, are no forces acting on it? Explain.

Short Answer

Expert verified

There might be forces acting on the object, but the summation of those forces must be zero.

Step by step solution

01

Step 1. Relation between the net force on an object and its acceleration

According to Newton鈥檚 second law, the net force acting on the object is directly proportional to its acceleration.

02

Step 2. Applying Newton’s second law on the object with zero acceleration

According to Newton鈥檚 second law, you know that acceleration is directly proportional to force and follows the relation

F=ma.

Here, m is the mass of the object, F is the net force applied, and a is the acceleration.

Thus, from the above relation, you can conclude that if the object does not experience any acceleration, it means the net force on that object must be zero.

Moreover, it also means that even though forces may be acting on that object, yet the summation of those forces is zero.

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Most popular questions from this chapter

An elevator (mass 4850 kg) is to be designed so that the maximum acceleration is 0.0680 g. What are the maximum and minimum forces that the motor should exert on the supporting cable?

(a) Why do you push down harder on the pedals of a bicycle when first starting out than when moving at a constant speed? (b) Why do you need to pedal at all when the cycle is at a constant speed?

At the instant a race began, a 65 kg sprinter exerted a force of 720 N on the starting block at a 22掳 angle with respect to the ground. (a) What was the horizontal acceleration of the sprinter? (b) If the force was exerted for 0.32 s, with what speed did the sprinter leave the starting block?

Suppose an object is accelerated by a force of 100 N. Suddenly, a second force of 100 N in the opposite direction is exerted on the object so that the forces cancel. The object

(a) is brought to rest rapidly.

(b) decelerates gradually to rest.

(c) continues at the velocity it had before the second force was applied.

(d) is brought to rest, and then it accelerates in the direction of the second force.

Why does a child in a wagon seems to fall backward when you give the wagon a sharp pull forward?
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