Chapter 6
Forces and Motions science
Class 4,
Questions 1,2,3,4,5,6,7,8,9,10 PTBB, Pakistan 2023
SLO's Topics covered in questions
Question:1
Describe Force with examples from daily life?
Answer:
The act of pushing or pulling a body is called force. Force is used to move or stop the body. For example, to open a door, we either pull it towards us or push it away. In fact push or pull are forces. There are few real life examples of forces like push or pull. If we press an empty can, it will be compressed. When we open a door we use pull or push force.
Question:2
Describe Motion with examples from daily life?
Answer:
You may have seen different types of swings in a park or playground. How do the move? The see-saw moves up and down. The merry-go-round moves in a circular motion. While the swing moves back and fourth. What do you observe from it?
The boy changes its position during movement. For example , a see-saw is in a state of rest in the park. Children sitting on a see-saw apply force on it and the see-saw starts moving up and down. The process in which a body changes its position is called motion.
Question:3
Define gravity as a force that draws objects to earth?
.jpg "Chapter 6 Forces and Motions science, class 4") |
| Chapter 6 Forces and Motions science, class 4, Questions 1,2,3,4,5,6,7,8,9,10 PTBB, Pakistan 2023 SLO's Topics covered in questions |
Answer:
Look at the following pictures and tell:
1. Why do the leaves of a tree fall to the ground, after leaving the branches?
2. Why does the fountain water fall on the ground?
3. Why does a ball thrown upward return to the ground after reaching a certain height?
You may have noticed that whatever is thrown upward, returns to the ground. The earth actually pulls bodies towards itself with a specific force. This force is called gravity of the Earth.
Question:4
Define friction with example?
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| Chapter 6 Forces and Motions science, class 4, Questions 1,2,3,4,5,6,7,8,9,10 PTBB, Pakistan 2023 SLO's Topics covered in questions |
Answer:
You may have noticed when you kick a football, it stops itself after a certain distance. Why does it stop? Certainly, there is a force acting on the football that stops it. What force that stops it. What force is this?
Friction is the force that stops or tends to stop the moving objects. Friction occurs when a body moves in contact with another body. Friction always acts against the direction of the movement.
Question:5
Describe advantages and disadvantages of friction?
Answer:
Advantages:
Friction plays very important role in our daily life. Igniting of match stick, penetration of the nail in the wood or wall, slowing down of the vehicles and eventually stopping are all possible due to friction.
Disadvantages:
Friction is very useful in our daily life but sometimes it can be harmful. For example, friction causes our shoes to wear out. Due to friction, the tires of the car not only get worn over time but sometimes they can even burst.
Question:5
What is a simple machine?
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| Chapter 6 Forces and Motions science, class 4, Questions 1,2,3,4,5,6,7,8,9,10 PTBB, Pakistan 2023 SLO's Topics covered in questions |
Answer:
The use of machine is increasing day by day. What is the reason for this?
Everything makes our work easier is called a machine. The machine makes our work easier by changing the amount and direction of the force.
Question:6
Explain lever, pulleys, gears and ramps in few lines with examples?
Answer:
Lever:
A lever is a simple machine that can be used to push or lift heavy objects. The lever is like a simple rod that turns around a certain point called fulcrum.
Example:
1.Cutting a page with scissor
2. See-Saw
3. Lifting a load with rod
Pulley:
A pulley is a simple machine, consists of a grooved wheel and a rope. The load is lifted up by applying force(effort) on one end of the rope passing over the pulley.
Examples:
1. As pulling a weight is easier than lifting it so the machine can easily lift heavy objects. For example , water can be easily drawn from a well by using a pulley.
2.The flag is raised up with the help of a pulley. For this, when you pull the rope down, it lifts the flag upwards.
Gears:
The gear is a simple machine which consists of toothed wheels of different sizes. The teeth of these wheels fit in with each other and move together. With the help of gears, we can increase or decrease the speed.
Examples:
In everyday life gears are used in bicycles, grinders and sugarcanes.
Inclined Planes or Ramps:
Inclined plane is a simple machine with one end relatively higher than the other. It requires less force and energy to move objects from one place to another. It allows us to move objects easily from bottom to top. The picture show different types of inclined planes.
Question:7
Why are different bodies sometimes found in a state of rest and motion?
Answer:
The state of rest or motion of different bodies is affected by their starting conditions, the balance of forces acting on them, friction, external forces, and their state of rest.
Question:8
If an object is thrown in upwards, why does it always return to the earth?
Answer:
It returns to earth because of gravity in earth.
Question:9
What is the importance of gear in a bicycle?
Answer:
Efficient power transfer, adaptability, and speed control.
Question:10
Why can not we walk easily on Ice ?
Answer:
We can not walk easily on ice because of less friction on ice. Reduced friction on ice causes instability, making walking difficult.
Question:11
Look carefully at the pictures given below. Which one of the shoe is suitable rocky soil, playground and icy surface? Explain the reason in your answer.
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| Chapter 6 Forces and Motions science, class 4, Questions 1,2,3,4,5,6,7,8,9,10 PTBB, Pakistan 2023 SLO's Topics covered in questions |
Answer:
Rocky Soil= shoe 3
Playground=shoe 2
Icy Surface = shoe 1
Question:12
The patient is sitting in a wheel chair. which machine will be helpful to take him on stage and why?
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| Chapter 6 Forces and Motions science, class 4, Questions 1,2,3,4,5,6,7,8,9,10 PTBB, Pakistan 2023 SLO's Topics covered in questions |
Answer:
Incline plane will be used here to take patient on stage.
Question:13
Suppose you are writing on a notebook with a pencil. Answer the following questions based on observation:
a) What force do you use while writing?
Push force
b) What is the role of friction in writing on paper with a pencil?
It helps us to grip the pencil and write smoothly.
c) After using the pencil, why do we need to sharpen it?
Pencil is reduced because of friction on page so we have to sharpen it.
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