kso eng9

in edu •  last year 

G10, Physics First Semester Test Time Allowed (45)minutes
Answer All Questions

  1. Fill in the blanks. (5 marks)
    (1) The value of gravitational constant is ………. .m3kg-1s-2.
    (2) A unit vector has the magnitude of ………. unit.
    (3) Since displacement has both ………. and direction, displacement is a vector quantity.
    (4) 1 N force acting horizontally on a body of mass 1 kg gives it an acceleration of ……… .
    (5) The unit of work in British system is ………. .
  2. Define “work”? A child pulling a toy car with a 10N force. The direction of the force makes an
    angle of 20° with the horizontal plane. If the car moves 6 m, how much work does the child do?
    3.Define the coefficient of volume expansion. A heat resistance glass at 15℃ is fully filled
    with 250 cm3 of glycerine. If the temperature increase to 25 ℃ how much glycerine overflows? The
    coefficient of volume expansiomove a wooden box or a big stone? Why?
    5.Is if correct to describe Newton’s second law in symbols as F α a?.
    A 3 ton car moving with the velocity of 30 mi h-1 is brought to stop in 2 s. Find the resisting force of the
    brakes acting on the car.
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