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Impulse–momentum theorem Knowledge-Based Practice

Physics · Momentum · Physics · Momentum & Impulse

10 Physics practice questions on Impulse–momentum theorem. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Two objects, X of mass 3.0 kg and Y of mass 12.0 kg, are initially at rest on a frictionless horizontal surface. If net forces act on them such that both objects acquire the same final kinetic energy, what is the ratio of the magnitude of the impulse delivered to object X to that delivered to object Y?

    • A) 1 : 2
    • B) 1 : 4
    • C) 2 : 1
    • D) 4 : 1
  2. 2.

    Two blocks with masses of 2.0 kg and 6.0 kg are initially at rest on a frictionless horizontal surface. If the same constant net horizontal force acts on each block for the same time interval, what is the ratio of the final speed of the 2.0 kg block to that of the 6.0 kg block?

    • A) 0.33
    • B) 3.0
    • C) 1.0
    • D) 9.0
  3. 3.

    A stationary 0.25 kg object is subjected to a net horizontal force that delivers an impulse of 6.0 N·s. What is the resulting kinetic energy of the object?

    • A) 18 J
    • B) 36 J
    • C) 72 J
    • D) 144 J
  4. 4.

    A 0.40 kg ball moving due east at 15 m/s is struck such that it moves due north at 20 m/s. What is the magnitude of the impulse delivered to the ball?

    • A) 2.0 N·s
    • B) 8.0 N·s
    • C) 10 N·s
    • D) 14 N·s
  5. 5.

    A constant net horizontal force of 24 N acts in the direction of motion on an 8.0 kg object moving along a straight line. If the object speeds up from 3.0 m/s to 12.0 m/s, for what time interval does this force act?

    • A) 3.0 s
    • B) 4.0 s
    • C) 5.0 s
    • D) 1.0 s
  6. 6.

    A constant net horizontal force of 20 N acts in the direction of motion on an object initially moving at 5.0 m/s. If the force acts for 4.0 s and increases the momentum of the object to 140 kg·m/s, what is the mass of the object?

    • A) 16 kg
    • B) 12 kg
    • C) 28 kg
    • D) 44 kg
  7. 7.

    A net force acting in a fixed direction on a 3.0 kg object, initially at rest, increases steadily from 0 N to 12 N over a 4.0 s time interval. What is the final speed of the object at the end of this interval?

    • A) 4.0 m/s
    • B) 6.0 m/s
    • C) 8.0 m/s
    • D) 16 m/s
  8. 8.

    A 2.0 kg block sliding on a frictionless horizontal surface has an initial velocity of 6.0 m/s to the east. If a net horizontal force delivers an impulse of 20 N·s directed to the west, what is the final velocity of the block?

    • A) 16 m/s to the west
    • B) 10 m/s to the east
    • C) 4.0 m/s to the east
    • D) 4.0 m/s to the west
  9. 9.

    A 1200 kg car traveling in a straight line at 20 m/s is brought to rest in 5.0 s by a constant braking force. What is the magnitude of the average braking force exerted on the car?

    • A) 2400 N
    • B) 4800 N
    • C) 6000 N
    • D) 24000 N
  10. 10.

    A 0.5 kg ball moving horizontally at 12 m/s strikes a vertical wall and rebounds horizontally in the opposite direction at 8 m/s. What is the magnitude of the impulse exerted on the ball by the wall?

    • A) 2 N·s
    • B) 10 N·s
    • C) 6 N·s
    • D) 20 N·s

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