1.Write True or False. (4- marks )
(a) Mass cannot be change by the location , shape and speed of the body.
(b) Different vector quantities like velocity and force cannot be added.
(c) Linear motion has only one direction.
(c) The centre of gravity is at 0.5 x102 cm mark for a uniform metre rule.
Fill in the blanks. (4- marks )
(a) Displacement is defined as the distance travelled along a _____ direction.
(b) Energy is the _____ to do work.
(c) The normal temperature is _____ ℉.
(d) The ice point is 0℃ in celsius scale and _____ K in kelvin scale.In the equation s =v0t + 1/2at2 ,s,v0 and a are magnitudes of the respective vector quantities.
Write down the equation in vector form.
A vector of magnitude 5 units is inclined at an angle 37° to the x axis . Find the magnitudes
of the vector components along x and y axis. ( 5- marks )Which of the following quantities are scalars and which are vectors?
(a) speed (b) velocity (c) average velocity (d) acceleration (e) displacement.
A particle starting from rest moves along a straight line with a constant acceleration of 2 ms-2.
What is the velocity of the particle 9 s after it started from rest? ( 5- marks )
SECTION (B)
Answer ALL Questions
Answer any FOUR Questions
- (a) Is work a vector or scalar? Define “energy”. A wooden sphere of mass 0.15 kg is thrown
with a velocity of 30 ms-1 .Find the kinetic energy of the sphere. (4-marks )
(b) Define “work” . Write down the unit of work in SI system. A woman push a child, who is
riding a tricycle, with a 200N force. The tricycle moves a distance of 2m and the work done
by the woman is 10 - (a) Define speed and velocity such that the two may be distinguished. An object moves with
an initial velocity of 4ms-1 . If it moves with a uniform acceleration of 2ms-2 find the
displacement after 20 s. (4-marks )
(b) A body moving with a constant acceleration reach the velocity 4ms-1 after 10s. If the
body start from rest , find the velocity after (a) 12s (b) 14s (c) 16s (d) 18s. Draw the
velocity time graph for the interval 10 s to 18 s. From the graph , find the velocities at
8s and 20s. (4marks )
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