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Attempts 127

Momentum of 5.5 kg ball at 4.5 m/s?

  1. A
    10 kg⋅m/s
  2. B
    16.2 km/h
  3. C
    24.75 kg⋅m/s
  4. D
    Not enough info

Topic Flashcards

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Question

What is the defining equation for linear momentum (p), and what are its standard units?

Answer

p = m * v, where *m* is mass and *v* is velocity. The standard unit is the kilogram-meter per second (kg·m/s).

Question

A 5.5 kg ball rolls at 4.5 m/s. Calculate its momentum. What would the momentum be if its velocity were doubled?

Answer

Initial momentum: 24.75 kg·m/s (5.5 kg * 4.5 m/s). If velocity doubles to 9.0 m/s, the new momentum would be 49.5 kg·m/s (5.5 kg * 9.0 m/s). Momentum is directly proportional to velocity when mass is constant.

Question

How does the momentum of a heavy truck moving slowly compare to a light bullet moving very fast? Explain using the formula p=mv.

Answer

The truck can have a large momentum due to its very large mass (m), even at a low speed. The bullet can have a large momentum due to its very high velocity (v), despite a small mass. Both mass and velocity contribute to the quantity of motion.

Question

Why is momentum described as a vector quantity, and what does this imply for calculations?

Answer

Because velocity (v) is a vector (has magnitude and direction). Therefore, momentum (p=mv) also has direction. This means momenta in opposite directions can cancel each other out, and direction must be accounted for in problems.

Question

What fundamental law of physics states that the total momentum of a closed, isolated system remains constant?

Answer

The Law of Conservation of Momentum. This principle is crucial for analyzing collisions and explosions

Mini Quiz

1 / 3
If an object's mass is doubled and its velocity is halved, does its momentum remain the same?

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