Explanation:
Let's solve each question step by step.
Q1. Tick (√) the correct option:
a) The idea of a lever is based on _________.
A lever works by using a fulcrum, effort, and load. All three are essential parts of a lever. So, the correct answer is "all of these".
Correct answer: iv) all of these
b) Greater distance between the effort and the fulcrum _________.
In a lever, when the effort is farther from the fulcrum, it requires less force to lift a load. This means you can move a greater load with less effort. So, greater distance allows a greater load to be moved.
Correct answer: ii) greater load can be moved
c) A machine made of two or more simple machines is called a _________.
A complex machine is made up of two or more simple machines working together. Examples include a bicycle (wheel, axle, lever, pulley).
Correct answer: iv) complex machine
d) There are _________ types of simple machines.
There are six types of simple machines: lever, wheel and axle, pulley, inclined plane, wedge, and screw.
Correct answer: iii) six
Q2. State whether the given statements are true (T) or false (F):
a) The fulcrum is the part of the lever that does not move.
The fulcrum is the pivot point of a lever, and it stays in place. So, this is true.
Answer: T
b) In third class lever the load is between the fulcrum and effort.
In a third class lever, the effort is between the fulcrum and the load. So, this statement is false.
Answer: F
c) Lever was the first simple machine discovered by our ancestors.
The lever is one of the earliest simple machines used by humans. It was discovered and used long ago. So, this is true.
Answer: T
d) When a long plank or pole is used to lift a large load it is called a lever.
Yes, a long plank or pole used to lift a load is a lever. This is true.
Answer: T
Q3. Match the following:
a) Crowbar – This is a lever where the fulcrum is at one end, effort is applied at the other, and load is in the middle. So, it is a Class I lever.
Match: Class I lever
b) Archimedes – He is famous for his work on levers and is known for saying, "Give me a place to stand, and I shall move the Earth." He used levers.
Match: moved a ship alone
c) Wheel barrow – The wheel is the fulcrum, the load is in the middle, and effort is applied at the handles. So, it is a Class II lever.
Match: Class II lever
d) Tongs – In tongs, the effort is applied in the middle, and the load is at one end. This is a Class III lever.
Match: Class III lever
e) Fulcrum – This is the point of support in levers.
Match: point of support in levers
Final Answer:
Q1.
a) iv) all of these
b) ii) greater load can be moved
c) iv) complex machine
d) iii) six
Q2.
a) T
b) F
c) T
d) T
Q3.
a) Class I lever
b) moved a ship alone
c) Class II lever
d) Class III lever
e) point of support in levers
Parent Tip: Review the logic above to help your child master the concept of simple machine worksheet.
