Wazari Exam (Iraq Baccalaureate) - Scientific Branch · Physics

Mechanics and waves

19 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 19 questions

  1. A body moves in a straight line with uniform acceleration. Its initial speed is 5 m/s and its acceleration is 2 m/s squared. How far does it travel in 4 s?
  2. A body moves in a straight line with uniform acceleration. Its initial speed is 8 m/s and its acceleration is 1 m/s squared. How far does it travel in 10 s?
  3. A stone is dropped from a height of 45 m (take g = 10 m/s squared and ignore air resistance). With what speed does it reach the ground?
  4. A stone is dropped from a height of 80 m (take g = 10 m/s squared and ignore air resistance). With what speed does it reach the ground?
  5. A ball is thrown horizontally at 12 m/s from a cliff 5 m high (g = 10 m/s squared, no air resistance). How far from the foot of the cliff does it land?
  6. Masses of 2 kg and 3 kg hang from the ends of a light string over a smooth pulley (g = 10 m/s squared). What is the tension while they move?
  7. Masses of 1 kg and 3 kg hang from the ends of a light string over a smooth pulley (g = 10 m/s squared). What is the tension while they move?
  8. Masses of 2 kg and 6 kg hang from the ends of a light string over a smooth pulley (g = 10 m/s squared). What is the tension while they move?
  9. Masses of 3 kg and 5 kg hang from the ends of a light string over a smooth pulley (g = 10 m/s squared). What is the tension while they move?
  10. A 2 kg trolley moving at 6 m/s collides with a 1 kg trolley moving at 0 m/s (positive direction to the right) and they stick together. What is their common velocity?
  11. A 2 kg trolley moving at 6 m/s collides with a 1 kg trolley moving at 0 m/s (positive direction to the right) and they stick together. How much kinetic energy is lost in the collision?
  12. A 3 kg trolley moving at 4 m/s collides with a 2 kg trolley moving at -1 m/s (positive direction to the right) and they stick together. How much kinetic energy is lost in the collision?
  13. A 1 kg trolley moving at 8 m/s collides with a 3 kg trolley moving at 0 m/s (positive direction to the right) and they stick together. How much kinetic energy is lost in the collision?
  14. A 4 kg trolley moving at 5 m/s collides with a 1 kg trolley moving at -5 m/s (positive direction to the right) and they stick together. What is their common velocity?
  15. A 4 kg trolley moving at 5 m/s collides with a 1 kg trolley moving at -5 m/s (positive direction to the right) and they stick together. How much kinetic energy is lost in the collision?
  16. A wave has frequency 100 Hz and wavelength 0.5 m. What is its speed?
  17. A wave has frequency 20 Hz and wavelength 1.5 m. What is its speed?
  18. An object is 30 cm from a converging lens of focal length 20 cm. How far from the lens is the image formed?
  19. An object is 20 cm from a converging lens of focal length 15 cm. How far from the lens is the image formed?

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