std 9th science chapter 1 law of motion exercise question answer| std9 science ch1 exercise answer
1Hi, friends this is educational help channel.
Your queries :-
Exercise class 9 science chapter 1 laws of motion, Workshop laws of motion, Std 9 science lesson 1, Question answer class 9 science chapter 1, Exercise laws of motion, Exercise class 9 science chapter 1, Swadhyay class 9 science, Class 9 general science
chapter 1, Class 9 general science laws of motion, Std 9 general science chapter 1 laws of motion, Exercise class 9 science chapter 1,question answer class 9th science chapter 1,law of motion exercise, sz edu tutorial, science ch 1 std9,std 9th science chapter 1 law of motion exercise question answer
Complete the sentences and explain
them.
a. The minimum distance between
the start and finish points of the
motion of an object is called the
.......... of the object.
b.
Deceleration is -------- acceleration
c. When an object is in uniform
circular motion, its
changes at every point.
d. During collision
constant.
remains
e. The working of a rocket depends
on Newton's ........ law of motion.
5. Give scientific reasons.
b.
a. When an object falls freely to the
ground, its acceleration is uniform.
Even though the magnitudes of
action force and reaction force are
equal and their directions are
opposite, their effects do not get
cancelled.
c. It is easier to stop a tennis ball as
compared to a cricket ball, when
both are travelling with the same
velocity.
d. The velocity of an object at rest is
considered to be uniform.
6. Take 5 examples from your
surroundings and give explanation
based on Newtons laws of motion.
7. Solve the following examples.
a) An object moves 18 m in the first
3 s, 22 m in the next 3 s and 14 min
the last 3 s. What is its average
speed?
(Ans: 6 m/s)
b) An object of mass 16 kg is moving
with an acceleration of 3 m/s².
Calculate the applied force. If the
same force is applied on an object of
mass 24 kg, how much will be the
acceleration? (Ans: 48 N, 2 m/s²)
c) A bullet having a mass of 10 g and
moving with a speed of 1.5 m/s,
penetrates a thick wooden plank of
mass 90 g. The plank was initially
at rest. The bullet gets embedded in
the plank and both move together.
Determine their velocity.
(Ans: 0.15 m/s)
d) A person swims 100 m in the first
40 s, 80 m in the next 40 s and 45 m
in the last 20 s. What is the average
speed?
(Ans: 2.25 m/s²)
#maharashtraboard
#question_answer
#trending
#all_subject_answer
#szedututorial