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Equations of Motion - 10 quick questions

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10 minutes maximum! (can you do it in 5?)

Q1-5...

A tennis ball - initially at rest - is dropped from a height of 5 m.

 

 1. Which of these answers correctly labels the letters 's', 'v' and 'u' in the 'suvats' equations?

  • A. s= speed, v = initial velocity, u = final velocity
  • B. s= speed, v = final velocity, u = initial velocity
  • C. s= displacement, v = initial velocity, u = final velocity
  • D. s= displacement, v = final velocity, u = initial velocity

 

2. Which of these answers correctly gives the values for 's', and 'u' and 'a' in the 'suvats' equations? (No units are given).

  • A. s= 0, a= 0, u = 0
  • B. s= 0, a = 10, u = 0
  • C. s= 5, a = 10, u = 0
  • D. s= 5, a = 10, u = 10


3. Which of these equations can be used without further calculation to find the impact velocity?

  • A. v = u + at
  • B. s= ut + ½ at2
  • C. v2 = u2 + 2as
  • D. s = ½ (u+v).t

4. What is the impact velocity of the ball?

  • A. 5 ms-1
  • B. 10 ms-1
  • C. √50 ms-1
  • D. 100 ms-1

5. How long did it take for the ball to fall?

  • A. 2 s
  • B. 0.5 s
  • C. 1 s
  • D. 10 s

 

 

6&7. A ball is rolled down a steep slope. The initial velocity is 2 ms-1 and it accelerates at a rate of 4 ms-2 for 5 seconds.

 

6. What is the final velocity of the ball?

  • A. 20 ms-1
  • B. 22 ms-1
  • C. 24 ms-1
  • D. 10 ms-1

7. How far does the ball roll in this time?

  • A. 8 m
  • B. 28 m
  • C. 50 m
  • D. 58 m

 

 

 

8-10. A stone is thrown horizontally at 10 ms-1 from a cliff of height 5 m.

Air resistance can be ignored.

 

8. Which of these correctly describes the changes in the horizontal and vertical components of velocity of the stone?

Horizontal velocity Vertical velocity
A
constant increasing
B
increasing constant
C
constant constant
D
decreasing increasing

 

9. What is the vertical velocity of the stone on impact?

  • A. 5 ms-1
  • B. 10 ms-1
  • C. √50 ms-1
  • D. 100 ms-1

10. The stone takes 1 second to reach the ground. How far from the cliff edge does the stone land?

  • A. 10 m
  • B. 20 m
  • C. 30 m
  • D. 40 m