2.2.2 Independence of projectile motion Quiz: Pearson Edexcel Physics, Unit 2

The 20 questions

1. For a projectile launched horizontally and ignoring air resistance, its horizontal velocity:

   • Increases steadily
   • Remains constant
   • Decreases steadily
   • Becomes zero at the top

2. For a projectile ignoring air resistance, its vertical acceleration is:

   • Dependent on its horizontal speed
   • Zero
   • g, downwards and constant
   • g, upwards

3. A ball is dropped from rest and a second ball is launched horizontally from the same height at the same instant. Ignoring air resistance, which lands first?

   • Both land at the same time.
   • The dropped ball lands first.
   • It depends on the launch speed.
   • The launched ball lands first.

4. A ball is launched horizontally at 10 m s^-1 from a cliff 20 m high (g = 10 m s^-2). How long does it take to reach the ground?

   • 0.5 s
   • 2 s
   • 1 s
   • 4 s

5. Using the same launch (10 m s^-1 horizontally, 2 s to land), what is the horizontal distance travelled?

   • 20 m
   • 200 m
   • 40 m
   • 10 m

6. A projectile is launched at 20 m s^-1 at 30 degrees above the horizontal. What is its horizontal velocity component?

   • 34.6 m s^-1
   • 17.3 m s^-1
   • 10.0 m s^-1
   • 20 m s^-1

7. For the same projectile (20 m s^-1 at 30 degrees), what is the vertical component of the launch velocity?

   • 17.3 m s^-1 upwards
   • 20 m s^-1 upwards
   • 10 m s^-1 upwards
   • 5.0 m s^-1 upwards

8. The vertical launch component is 10 m s^-1 upwards with g = 10 m s^-2. How long does the projectile take to reach its maximum height?

   • 1.0 s
   • 2.0 s
   • 0.5 s
   • 1.7 s

9. For a projectile that lands at the same height it was launched from, the total time of flight compared with the time to maximum height is:

   • Four times as long
   • Twice as long
   • Equal
   • Half as long

10. A ball rolls off a table at 2 m s^-1 horizontally from a height of 0.8 m, with g = 10 m s^-2. How long does it take to hit the floor?

    • 0.4 s
    • 0.16 s
    • 0.2 s
    • 0.8 s

11. For the table ball in the previous question (2 m s^-1 horizontal, 0.4 s in the air), what horizontal distance does it travel before landing?

    • 0.4 m
    • 0.8 m
    • 1.6 m
    • 0.2 m

12. A projectile lands at the same height from which it was launched, ignoring air resistance. Compared with its launch, the vertical velocity at landing is:

    • Zero.
    • Equal in magnitude and in the same direction.
    • Equal in magnitude and opposite in direction.
    • Twice the launch vertical velocity.

13. A projectile is launched at 45 degrees. If its launch speed is doubled, by what factor does its range change?

    • sqrt(2) times
    • 1/2 times
    • 4 times
    • 2 times

14. Which statement explains why horizontal and vertical motions can be analysed separately for a projectile, ignoring air resistance?

    • The projectile's mass is zero at the top of its path.
    • Horizontal and vertical forces always cancel each other.
    • Gravity acts only horizontally and does not change the vertical velocity.
    • Gravity acts only vertically, so it does not change the horizontal velocity.

15. A ball is thrown horizontally at 15 m s^-1 from a height of 45 m (g = 10 m s^-2). What is its horizontal distance from the launch point when it lands?

    • 30 m
    • 15 m
    • 45 m
    • 135 m

16. Which quantity is common to both the horizontal and vertical analysis of a projectile?

    • Time
    • Horizontal velocity
    • Mass
    • Vertical acceleration

17. A projectile is launched at a speed of 25 m s^-1 at an angle with sin = 0.8 and cos = 0.6. What is the horizontal component of velocity?

    • 10 m s^-1
    • 20 m s^-1
    • 25 m s^-1
    • 15 m s^-1

18. Ignoring air resistance, a projectile launched at 30 degrees has the same range as one launched at which other angle with the same speed?

    • 60 degrees
    • 45 degrees
    • 15 degrees
    • 90 degrees

19. A stone is thrown horizontally at 5 m s^-1 from a height of 5 m (g = 10 m s^-2). How long does it take to reach the ground?

    • 5 s
    • 2 s
    • 0.5 s
    • 1 s

20. Which of these does NOT affect the time of flight of a projectile launched horizontally from a height, ignoring air resistance?

    • The vertical acceleration
    • The horizontal launch speed
    • The launch height
    • The value of g

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