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- Basic Math and Science Newton's Laws of Motion Questions and Answers Flashcards

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  1. A 3 kg object and a 9 kg object are dropped from the same height in a vacuum. Which hits the ground first?

    Answer: They hit at the same time

    In a vacuum, all objects fall with the same gravitational acceleration regardless of mass.

  2. A 4 kg object requires a net force of 16 N to accelerate. If the mass is doubled to 8 kg with the same force, the new acceleration is:

    Answer: 2 m/s²

    Original acceleration = 16/4 = 4 m/s²; doubling mass halves acceleration to 2 m/s².

  3. A skateboarder stands still on a skateboard and throws a ball forward. The skateboarder moves:

    Answer: Backward

    By Newton's Third Law, the reaction to throwing the ball forward pushes the skateboarder backward.

  4. What is the SI unit of force?

    Answer: Newton (N)

    The Newton (N) is the SI unit of force, equivalent to kg·m/s².

  5. A net force causes a 6 kg object to accelerate at 2 m/s². If the same force is applied to a 3 kg object, its acceleration would be:

    Answer: 4 m/s²

    Force = 6×2 = 12 N; applied to 3 kg: a = 12/3 = 4 m/s².

  6. Which of the following is an example of Newton's First Law in everyday life?

    Answer: A passenger lurching forward when a bus brakes suddenly

    The passenger's body resists the change in motion (inertia) and continues forward when the bus stops.

  7. Two ice skaters push off each other. Skater A has mass 50 kg and Skater B has mass 100 kg. If Skater A moves at 4 m/s, how fast does Skater B move (ignoring friction)?

    Answer: 2 m/s

    Conservation of momentum: 50×4 = 100×v, so v = 2 m/s for Skater B.