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Physics Flashcards

7 cards from real Regents practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Physics flashcards as text

  1. A car traveling at 20 m/s applies its brakes and comes to rest in 4 seconds. What is the magnitude of the car's acceleration?

    Answer: 5 m/s²

    Acceleration = Δv/Δt = (0 − 20)/4 = −5 m/s², so the magnitude is 5 m/s².

  2. Which of the following best describes a scalar quantity?

    Answer: Speed

    Speed has magnitude only (no direction), making it a scalar, while velocity, displacement, and force are vectors.

  3. A 5 kg object is acted upon by a net force of 15 N. What is its acceleration?

    Answer: 3 m/s²

    Newton's second law: a = F/m = 15/5 = 3 m/s².

  4. An object is thrown horizontally from a cliff. Which component of its velocity increases as it falls?

    Answer: Vertical

    Gravity accelerates the object downward, increasing the vertical component; horizontal velocity remains constant (ignoring air resistance).

  5. Two objects with charges +2 μC and −2 μC are placed 0.1 m apart. Compared to the force on the positive charge, the force on the negative charge is:

    Answer: Equal in magnitude but opposite in direction

    Newton's third law applies to electrostatic forces: the forces are equal in magnitude but opposite in direction.

  6. What happens to the wavelength of a wave if its frequency doubles while the wave speed stays constant?

    Answer: It halves

    Since v = fλ and v is constant, if f doubles then λ must halve to keep the product constant.

  7. A 10 kg block rests on a frictionless horizontal surface. A horizontal force of 40 N is applied. What is the block's acceleration?

    Answer: 4 m/s²

    a = F/m = 40/10 = 4 m/s².