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Chapter 2: Q2-3 (page 81)

You observe three carts moving to the left. Cart A moves to the left at nearly constant speed. Cart B moves to the left, gradually speeding up. Cart C moves to the left, gradually slowing down. Which cart or carts, if any, experience a net force to the left?

Short Answer

Expert verified

Cart B experiences a net force to the left.

Step by step solution

01

Definition of Net force

The net force, also known as the resultant force, is the sum of all forces acting on an item at the same time.

02

Find that when there is a net force to the left, whichever cart or carts are it?

  • Cart 'A' accelerates to the left at a near-constant rate.

  • Cart 'B' accelerates as it advances to the left.

  • Cart ‘C' moves to the left, swooping down gradually.

  • The net force acting on an object moving at constant speed is zero, hence there is no net force acting on cart 'A' toward the left.

  • When the item's velocity and force are in the same direction, the object will accelerate.

  • Because the Cart B is speeding up and travelling to the left, there is a net force operating on the cart 'B' to the left.

  • When the velocity and force directions are opposite, the item slows down.

  • Because the cart C is slowing down and travelling to the left, there is a net force operating on the cart 'C' to the right.

Thus, the Cart ‘B’ is the cart that is being pushed to the left by the net force.

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Most popular questions from this chapter

A carbon resistor is 5 mm long and has a constant cross section of0.2mm2The conductivity of carbon at room temperature is σ=3×104perohm-m.In a circuit its potential at one end of the resistor is 12 V relative to ground, and at the other end the potential is 15 V. Calculate the resistance Rand the current I (b) A thin copper wire in this circuit is 5 mm long and has a constant cross section of 0.2mm2.The conductivity of copper at room temperature is σ=6×107ohm-1m-1.The copper wire is in series with the carbon resistor, with one end connected to the 15 V end of the carbon resistor, and the current you calculated in part (a) runs through the carbon resistor wire. Calculate the resistance Rof the copper wire and the potential Vatendat the other end of the wire.

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