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Assignment 1 (Force and laws of motion)

Murari Parashar
Murari Parashar

This document contains 7 homework questions about forces and motion for a 9th grade science class. The questions cover topics like inertia, changes in velocity, unbalanced forces, and why objects move when forces are applied. Students are asked to identify which objects have more inertia, count changes in velocity, explain why leaves detach from trees and passengers fall in moving vehicles, discuss if an object can have velocity with zero net external force, and explain phenomena like dust coming from carpets and tying luggage to bus roofs. The homework aims to test students' understanding of key concepts in the chapter about force and Newton's laws of motion.

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Date :- 13/07/2020 Grade 9 Chapter 9 (Force and Laws of Motion) Home Assignment Q1. Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a fiverupees coin and a one-rupee coin? Q2. In the following example, try to identify the number of times the velocity of the ball changes: A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team. Also identify the agent supplying the force in each case. Q3. Explain why some of the leaves may get detached from a tree if we vigorously shake its branch. Q4. Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest? Q5. An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason. Q6. When a carpet is beaten with a stick, dust comes out of it. Explain. Q7. Why is it advised to tie any luggage kept on the roof of a bus with a rope? Murari Parashar Mob. 9460991468

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Assignment 1 (Force and laws of motion)

  • 1. Date :- 13/07/2020 Grade 9 Chapter 9 (Force and Laws of Motion) Home Assignment Q1. Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a fiverupees coin and a one-rupee coin? Q2. In the following example, try to identify the number of times the velocity of the ball changes: A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team. Also identify the agent supplying the force in each case. Q3. Explain why some of the leaves may get detached from a tree if we vigorously shake its branch. Q4. Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest? Q5. An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason. Q6. When a carpet is beaten with a stick, dust comes out of it. Explain. Q7. Why is it advised to tie any luggage kept on the roof of a bus with a rope? Murari Parashar Mob. 9460991468