BHAWANI DAYAL ARYA COLLEGE
YEAR 12 PHYSICS: 2021
WORKSHEET 1
STRAND 1: MECHANICS
Sub-strand 1.1 Measurement
1.
2.
3.
The number of significant figures in 0.060 is
A.
1
B.
2
C.
3
D.
4
Precision of a micrometer screw gauge is
A.
0.01m
B.
0.1 cm
C.
0.1 mm
D.
0.01 mm
The dimensions of a microscopic glass slide are given as follows:
l = (7.5 ± 0.1) cm
w = ( 2.50 ± 0.01) cm
Calculate the area of the slide with its appropriate absolute uncertainty.
Sub-strand 1.2 Relationships
1.
Which one of the following Y versus X graphs depict square relationship?
Sub-strand 1.3 Vectors
1.
A soccer ball hits the goal post with 24 ms-1 and rebounds at
18 ms-1 as shown below.
Calculate the ball’s change in velocity.
2.
A man rows a boat at a steady speed of 2 ms-1. He sets out at right angles to the section of a river which is
100 m wide. The river flows downstream at 1.5 ms-1.
Calculate the
(i)
time taken to cross the river.
(ii)
distance, d moved downstream while crossing the river.
(iii)
speed of the boat relative to the river bank.
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Sub-strand 1.4 Forces
1.
A body is moving under the action of three forces that have a zero resultant. This means that the body will
A.
C.
2.
move at a constant speed.
slow down to a lower speed.
B.
D.
speed up to a higher speed.
will never be brought to a state of rest.
A 55 kg mass hanging from a ceiling is pulled to the right at an angle of 30o by a force F as shown below.
If the system is in equilibrium, calculate the
3.
(i)
force, F.
(ii)
tension in the string joining the mass to the ceiling.
Two masses are connected on a horizontal table surface by a light inextensible pulley as shown.
Assuming that the horizontal table surface is frictionless, calculate the
acceleration of the system.
4.
A two mass system is connected over a light frictionless pulley as shown.
Calculate the
(i)
force, F experienced by 3 kg mass.
(ii)
net force.
(iii)
acceleration of the system.
Sub-strand 1.5 Moments
1.
A uniform rod 120 cm long weighing 40 N is loaded with various weights as shown below.
Calculate the total clockwise moments about the fulcrum.
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