Linear momentum Knowledge-Based Download PDF

Questions

1. 1.

   In the International System of Units (SI), the unit of linear momentum, kilogram meter per second (kg·m/s), is equivalent to which of the following units?

   • A) Joule-second (J·s)
   • B) Watt-second (W·s)
   • C) Newton-second (N·s)
   • D) Newton per second (N/s)
2. 2.

   Which of the following physical quantities is equal to the time rate of change of an object's linear momentum?

   • A) Kinetic energy
   • B) Net work
   • C) Power
   • D) Net force
3. 3.

   For a moving particle of constant positive mass, which of the following vectors always points in the same direction as its linear momentum vector?

   • A) Its instantaneous velocity vector
   • B) Its instantaneous acceleration vector
   • C) The net external force vector acting on it
   • D) Its position vector relative to a fixed origin
4. 4.

   For an object moving along a straight line, what physical quantity is represented by the area between the curve and the time axis on a net force versus time graph?

   • A) The total work done on the object
   • B) The change in the object's kinetic energy
   • C) The instantaneous power delivered to the object
   • D) The change in the object's linear momentum
5. 5.

   A system consists of two objects: a 2.0 kg cart moving due east at 4.0 m/s and a 3.0 kg cart moving due north at 2.0 m/s. What is the magnitude of the total linear momentum of the system?

   • A) 2.0 kg·m/s
   • B) 7.0 kg·m/s
   • C) 10 kg·m/s
   • D) 14 kg·m/s
6. 6.

   A 0.50 kg ball moving horizontally at 8.0 m/s strikes a wall and rebounds horizontally in the opposite direction at 6.0 m/s. What is the magnitude of the change in the ball's linear momentum?

   • A) 1.0 kg·m/s
   • B) 7.0 kg·m/s
   • C) 4.0 kg·m/s
   • D) 14.0 kg·m/s
7. 7.

   An object of constant mass has a linear momentum of magnitude $p$. If its kinetic energy is increased by a factor of 4, what is the new magnitude of its linear momentum?

   • A) $2p$
   • B) $4p$
   • C) $8p$
   • D) $16p$
8. 8.

   A 1200 kg car travels along a circular track at a constant speed of 15 m/s. Which of the following statements correctly describes the linear momentum of the car?

   • A) Its linear momentum is zero because the net displacement over each complete lap is zero.
   • B) Its linear momentum remains constant in both magnitude and direction because the speed is constant.
   • C) Its linear momentum has a continuously changing magnitude and a constant direction directed toward the center of the track.
   • D) Its linear momentum has a constant magnitude but a continuously changing direction.
9. 9.

   Object X has a mass of 4.0 kg and travels at a speed of 3.0 m/s. What speed must an object Y with a mass of 2.0 kg have so that both objects have the same magnitude of linear momentum?

   • A) 1.5 m/s
   • B) 6.0 m/s
   • C) 8.0 m/s
   • D) 12 m/s
10. 10.

    An object with a mass of 2.5 kg travels along a straight path at a constant velocity of 6.0 m/s. What is the magnitude of the object's linear momentum?

    • A) 2.4 kg·m/s
    • B) 8.5 kg·m/s
    • C) 15 kg·m/s
    • D) 45 kg·m/s