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Physics: Forces and Motion Flashcards

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

Read the first 6 Physics: Forces and Motion flashcards as text

  1. What is the unit of momentum in SI units?

    Answer: kg·m/s

    Momentum = mass × velocity, so its SI unit is kg·m/s (kilogram metres per second).

  2. A 2 kg object travelling at 4 m/s collides and sticks to a stationary 2 kg object. What is their combined speed after the collision?

    Answer: 2 m/s

    By conservation of momentum: 2×4 = 4×v, so v = 8/4 = 2 m/s.

  3. What does the area under a velocity-time graph represent?

    Answer: Distance travelled

    The area under a velocity-time graph gives the displacement (distance travelled) of the object.

  4. Which force opposes the motion of a car moving through air?

    Answer: Air resistance (drag)

    Air resistance (drag) is the force that acts opposite to the direction of motion of an object moving through air.

  5. At terminal velocity, what can be said about the forces on a falling object?

    Answer: Weight and drag are equal.

    At terminal velocity the resultant force is zero, meaning weight downward equals drag upward, so acceleration is zero.

  6. A force of 20 N acts on an object for 5 seconds. What is the impulse delivered to the object?

    Answer: 100 N·s

    Impulse = Force × time = 20 N × 5 s = 100 N·s.