I. Work done by load is always less than the work done by effort.
II. All machines are made of levers, pulleys, screws and gear wheels.
III. A fishing rod is a machine.
Iv. Effort is always larger than load.
which of statements above about machines are true?
II and III
III and IV
I and III
II and iv
Explanation
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Discussions (15)
Let's analyze each statement:
Statement Analysis
1. *I. Work done by load is always less than the work done by effort.*
- This statement is *TRUE*. In a machine, the work done by the effort (input force) is always greater than the work done by the load (output force), due to energy losses (e.g., friction).
2. *II. All machines are made of levers, pulleys, screws, and gear wheels.*
- This statement is *FALSE*. While many machines do use these components, not all machines are composed of these specific parts. Machines can be made from various components and mechanisms.
3. *III. A fishing rod is a machine.*
- This statement is *TRUE*. A fishing rod can be considered a simple machine, specifically a type of lever, which helps to amplify the force applied to the rod.
4. *IV. Effort is always larger than load.*
- This statement is *FALSE*. In a machine, the effort (input force) is not always larger than the load (output force). The relationship between effort and load depends on the machine's design and purpose.
The final answer is: $\boxed{I, III}$
c is correct all machines are made up of
inclined plane
lever
and hydraulic press
Please this needs to be corrected the answer c is misleading how can the effort put on a machine be more than the load
