Unit 7 - Forces

15 Questions
Unit 7 - Forces

A 15 question quiz on forces.

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Questions and Answers
  • 1. 
    Which forces could be labelled on a yo-yo?
    • A. 

      Gravity

    • B. 

      Normal

    • C. 

      Friction

    • D. 

      Centripetal

  • 2. 
    Match Newton´s laws to their definitions:
    • A. 1st
    • A.
    • B. 2nd
    • B.
    • C. 3rd
    • C.
    • D. Universal Gravitation
    • D.
  • 3. 
    What is the symbol for acceleration due to gravity?
    • A. 

      A

    • B. 

      G

    • C. 

      9.8

    • D. 

      M/s^2

  • 4. 
    • A. 

      1250 kg and 121 N

    • B. 

      1250 g and 12.1 N

    • C. 

      12.5 kg and 121 N

    • D. 

      12.5 kg and 12.1 N

  • 5. 
    A 28-ton truck changes its speed over 200 s from 36 km/h to 54 km/h. Determine the force exerted by it.
    • A. 

      1400 N

    • B. 

      500 N

    • C. 

      900 N

    • D. 

      700 N

  • 6. 
    On a body of 200 kg, a force is exerted 400 N. Calculate the acceleration acquired by the body and use this to, assuming the object begins at rest, how fast will be travelling(in m/s) after 10 s?(Type only the number e.g. 15)
  • 7. 
    Which units could be used for pressure? (Write down the formula first to help)
    • A. 

      N/m2

    • B. 

      Pa

    • C. 

      KPa

    • D. 

      N/mm2

  • 8. 
    What is the pressure produced by a force of 25000 N acting on an area of 5 m2.
    • A. 

      5 Pa

    • B. 

      50 Pa

    • C. 

      500 Pa

    • D. 

      5000 Pa

  • 9. 
    Match the following conversions
    • A. 1 cm2
    • A.
    • B. 1 m2
    • B.
    • C. 1 dm2
    • C.
    • D. 1000 dm3
    • D.
    • E. 1000 mm3
    • E.
    • F. 0.5 m3
    • F.
  • 10. 
    Determine the surface, in m2, of the base of a monument of 30 tonnes if the pressure exerted on its base is 25 N/cm2. (g=10 m/s2)
    • A. 

      0.6

    • B. 

      0.8

    • C. 

      1.0

    • D. 

      1.2

  • 11. 
    Calculate the pressure of a monument of 30 tonnes if its base is a rectangle measuring 20 cm long and 1.5 m wide. (g = 10 m / s2)
    • A. 

      1000000 Pa

    • B. 

      500 Pa

    • C. 

      20000000000000 Pa

    • D. 

      150 Pa

  • 12. 
    When talking about pressure that is felt by an object underwater we use the term "hydrostatic". To calculate this pressure we use the equation: p = __ · __ · __Write the 3 letters used below without spaces between them.
  • 13. 
    Calculate the pressure in the S.I units, which a diver feels when they are 5 m deep. Density of seawater is 1.1 g / cm3. (g=10 m/s2)
    • A. 

      50000 Pa

    • B. 

      55000 Pa

    • C. 

      60000 Pa

    • D. 

      65000 Pa

  • 14. 
    A child gets into a pool, dislodging water weighing 600 N.What mass is the boy assuming he is only just floating in the water? (Use g=9.8)
    • A. 

      61 kg

    • B. 

      68 kg

    • C. 

      74 kg

    • D. 

      80 kg

  • 15. 
    A steel ball of radius 5 cm is immersed in pure water. Calculate the thrust of the water and the weight of the ball (density of steel = 7.9 g / cm3). Vsphere = (4/3)·r3
    • A. 

      2.63 and 18.9

    • B. 

      1.63 and 12.9

    • C. 

      5.63 and 14.0

    • D. 

      3.63 and 3.9