MEDIUM
9th ICSE
IMPORTANT
Earn 100

A man pulls a monkey suspended in the air by means of rope (1) and other hand of the monkey is tied to a tree through another rope (2). Mark any four sets of action-reaction pairs in this problem.

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Important Questions on Laws of Motion

MEDIUM
9th ICSE
IMPORTANT
Together With Physics Class 9>Chapter 3 - Laws of Motion>Self Evaluation Test>Q 9
Distinguish between acceleration due to gravity and universal gravitational constant. Give three differences.
MEDIUM
9th ICSE
IMPORTANT
Together With Physics Class 9>Chapter 3 - Laws of Motion>Self Evaluation Test>Q 10
Give at least two illustrations of Newton's third law of motion.
MEDIUM
9th ICSE
IMPORTANT
Together With Physics Class 9>Chapter 3 - Laws of Motion>Self Evaluation Test>Q 11
The blades of a ceiling fan continue to rotate even when the current is switched off. Why?
EASY
9th ICSE
IMPORTANT
Together With Physics Class 9>Chapter 3 - Laws of Motion>Self Evaluation Test>Q 12
Two bodies on the surface of the earth do not move towards each other due to force of attraction given by Newton's law of gravitation. Why?
MEDIUM
9th ICSE
IMPORTANT
Together With Physics Class 9>Chapter 3 - Laws of Motion>Self Evaluation Test>Q 13
A constant retarding force of 40 N is applied to the body of mass 20 kg moving initially with a speed of 14 m s-1. How long does the body take to stop in seconds?
MEDIUM
9th ICSE
IMPORTANT
Together With Physics Class 9>Chapter 3 - Laws of Motion>Self Evaluation Test>Q 14
A ball is thrown vertically upward from the top of a cliff of height 21.21 m with an initial velocity 11 m/s. Taking g=9.8 m/s2, calculate the height (in m) to which it will rise before returning to the ground. (Find the value upto two decimals.)
HARD
9th ICSE
IMPORTANT
Together With Physics Class 9>Chapter 3 - Laws of Motion>Self Evaluation Test>Q 14
A ball is thrown vertically upward from the top of a cliff of height 21.21 m with an initial velocity 11 m/s. Taking g=9.8 m/s2, calculate the velocity with which it will strike the ground in terms of metre per second.
Choose correct answer from the given options (23.16, 30)
HARD
9th ICSE
IMPORTANT
Together With Physics Class 9>Chapter 3 - Laws of Motion>Self Evaluation Test>Q 14
A ball is thrown vertically upward from the top of a cliff of height 21.21 m with an initial velocity 11 ms-1 and while coming down its velocity is 23.16 ms-1. Taking g=9.8 ms-2, calculate the total time of the journey of the ball in seconds.