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حرکت اور قوت

گیارہویں جماعت · طبیعیات · 6 سوالات

نام: ____________________   تاریخ: ____________

  1. A car accelerates uniformly from 10 m/s to 30 m/s in 5 s. How far does it travel?

    • A 150 m
    • B 100 m
    • C 200 m
    • D 50 m

  2. A projectile is launched at 45 degrees. For a given speed this angle gives:

    • A Minimum range
    • B Maximum height only
    • C Maximum range
    • D Zero range

  3. A 2 kg mass moves at 5 m/s. What is its momentum?

    • A 2.5 kg m/s
    • B 25 kg m/s
    • C 10 kg m/s
    • D 7 kg m/s

  4. In an elastic collision:

    • A Only momentum is conserved
    • B Both momentum and kinetic energy are conserved
    • C Only energy is conserved
    • D Nothing is conserved

  5. Impulse is equal to the change in:

    • A Energy
    • B Mass
    • C Velocity only
    • D Momentum

  6. A ball is thrown upwards at 20 m/s. What is the time to reach the top? (g = 10 m/s2)

    • A 4 s
    • B 1 s
    • C 20 s
    • D 2 s

جوابی کلید

1. B, 2. C, 3. C, 4. B, 5. D, 6. D

  1. Average speed = 20 m/s, distance = 20 x 5 = 100 m.

  2. Range = u2 sin(2 theta) / g is greatest when theta is 45 degrees.

  3. p = m v = 2 x 5 = 10 kg m/s.

  4. Elastic collisions conserve both.

  5. Impulse = F t = change in momentum.

  6. t = u / g = 20 / 10 = 2 s.