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Chapter 2: Q2 (page 81)

An object is moving in the + ydirection. Which. If any, of the following statements might be true? Check all that apply. a) the net force on the object is zero. b) The net force on the object is in the - ydirection. c) the net force on the object is in the + ydirection.

Short Answer

Expert verified

Answer

  • the net force on the object is zero
  • the net force on the object cannot work in the - y direction
  • the net force on the object cannot work in the + y direction

Step by step solution

01

 Step 1: Identification of the given data 

The given data can be listed below as:

  1. The object is moving in the + y direction.
02

 Step 2: Significance of Newton’s second law for the object 

This law states that the rate of the change of the momentum of a body is mainly equal to the magnitude and direction of the imposed force.

The change of force of the body gives the net change in momentum of a body.

03

 Step 3: Determination of the net force on the object

  • According to Newton’s first law, the net force is zero only when the object is at rest or moving with constant velocity. Hence, according to the question, there is no mention of the velocity of the object.

Thus, the net force on the object is zero.

  • From Newton’s second law, the net force goes in the direction in which the object moves.

Thus, the net force on the object cannot work in the -y direction.

  • From Newton’s first law, the net force goes in the direction in which the object moves.

Thus, the net force on the object cannot work in the + y direction.

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