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The document contains a series of physics problems from various educational boards, focusing on concepts such as energy conservation, momentum, acceleration, and forces. It includes questions about the behavior of objects under different forces and conditions, as well as calculations related to motion and penetration of materials. Each section requires mathematical analysis and explanations of physical principles.

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48 views2 pages

3

The document contains a series of physics problems from various educational boards, focusing on concepts such as energy conservation, momentum, acceleration, and forces. It includes questions about the behavior of objects under different forces and conditions, as well as calculations related to motion and penetration of materials. Each section requires mathematical analysis and explanations of physical principles.

Uploaded by

rumyhossain3
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Chapter 3

Maymansing Board 21
8. Shamim collected a spring of mass 10kg to through an object to a height 20m. He compressed the spring 8cm by
doing 800J work. But the spring was not able to throw the object at that height. Shamim compressed the spring more,
so that he can throw the object at that desired height.
a. Write the conservation law of energy. 1
b. Explain the relation between momentum and kinetic energy. 2
c. If the work done by the object is same as the spring then how much distances will the object go along the land?
[Force applied to the object is 20N] 3
d. By how much compression on the spring Shamim will be able to throw the object to the desired height? Analyze
mathematically.

Jassore board 2021


6. A bullet penetrated 2 cm of a tree with the velocity of 30 ms -1, The thickness of tree is 6.5 cm. The velocity of the
bullet is decreased by one-third after penetrating 2cm. After that, the bullet moved for 1 sec.
a. Write down one equation of motion. 1
b. Why the acceleration of throwing object is negative? Explain it. 2
c. Find out the value of acceleration of the bullet. 3
d. Will the bullet be able to penetrate the tree? Explain It mathematically, 4
Comilla Board 21
A bullet is fired with a velocity of 40 ms -1. There is a wooden board attached with a earthen wall at a distance 50 m.
The bullet has stopped after 0.01 sec entering into the board. The thickness of the board was 21 cm.
What is instantaneous speed? 1
The displacement may become zero but distance will not be zero of a moving object. Explain.
At what time the bullet will hit the wooden board? 3
Whether the wall will be damaged by the bullet or not? Show logic in favour of your answer? 4

Chittagong board 2020


2.

a. Define balance force. 1


b. Why walking is difficult in a muddy street? 2
c. Calculate the distance of the car by 20 seconds according to fig-2. 3
d. According to fig-1 analyze the force of the object P on the object M. 4
4

Dinajpur board 2020


2.

a. Define rolling friction. 1


b. When an object is falling from a steady state, the velocity of the object is changing— Why? 2
c. According to fig-2 calculate the distance of the car by 20 seconds. 3
d. According to fig-1 analyze the force of the object 'P' on the object 'M'. 4

Dhaka Board 2020


Mass of an object is 5 kg and its position is steady. Now 5N force acts on this object for 4s. after 4s again 10 N force
acts on this object for 4s.
a What is called wave?
b. Write the characteristics of the image which created in the plane mirror.
c. Determine the distance for first 8s of the object_ 3
d. Analyze the motion of the object by drawing velocity vs time graph according to the information . of the stem.4

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