7th std - science - chapter 7 motion Force and work question answer |Exercise std 7 sci ch 7 answer
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1. Fill in the blanks with the proper
words from the brackets.
(stationary, zero, changing, constant,
displacement, velocity, speed,
acceleration, stationary but not zero,
increases)
(a) If a body traverses a distance in
direct proportion to the time, the
speed of the body is
(b) If a body is moving with a constant
velocity its acceleration is
(c)
(d)
is a scalar quantity.
is the distance traversed by
a body in a particular direction in
unit time.
4 km
Exercise
2. Observe the figure and answer the
questions. C
5 km
********.
B
Newton
A
3 km B 3 km D 3 km
Sachin and Sameer started on a
motorbike from place A, took the turn
at B, did a task at C, travelled by the
route CD to D and then went on to E.
Altogether, they took one hour for this
journey. Find out the actual distance
traversed by them and the displacement
from A to E. From this, deduce their
speed. What was their velocity from A
to E in the direction AE? Can this
velocity be called average velocity?
3. From the groups B and C, choose the
proper words, for each of the words
in group A.
A
Work
Force
Metre
Displacement Joule
E
C
erg
cm
dyne
4. A bird sitting on a wire, flies, circles
around and comes back to its perch.
Explain the total distance it traversed
during its flight and its eventual
displacement.
5. Explain the following concepts in your
own words with everyday examples :
force, work, displacement, velocity,
acceleration, distance.
6.
A ball is rolling from A to D on a
flat and smooth surface. Its speed is
2 cm/s. On reaching B, it was pushed
continuously up to C. On reaching D
from C, its speed had become 4cm/s.
It took 2 seconds for it to go from B
to C. What is the acceleration of the
ball as it goes from B to C?
7.
A
D
B
C
Solve the following problems.
(a) A force of 1000N was applied to
stop a car that was moving with a
constant velocity. The car stopped
after moving through 10m. How
much is the work done?
(b) A cart with mass 20 kg went 50m
in a straight line on a plain and
smooth road when a force of 2N
was applied to it. How much work
was done by the force?
Project:
Collect information about the
study made by Sir Isaac Newton
regarding force and acceleration
and discuss it with your teacher.
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