Q9 of 82 Page 76

The acceleration of a particle is zero as measured from an inertial frame of reference. Can we conclude that no force acts on the particle?

No because the acceleration of the particle can also be zero if the vector sum of all the forces is zero. So, no net force acts on the particle but component forces can exist.


More from this chapter

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7

An object is placed far away from all the objects that can exert force on it. A frame of reference is constructed by taking the origin and axes fixed in this object. Will the frame be necessarily inertial?

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Figure (5-Q1) shows a light spring balance connected to two blocks of mass 20 kg each. The graduations in the balance measure the tension in the spring. (a) What is the reading of the balance? (b) Will the reading change if the balance is heavy, say 20 kg? (c) What will happen if the spring is light but the blocks have unequal masses?


 10

Suppose you are running fast in a field when you suddenly find a snake in front of you. You stop quickly. Which force is responsible for your deceleration?

 11

If you jump barefooted on a hard surface, your legs get injured. But they are not injured if you jump on a soft surface like sand or pillow. Explain.