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प्रश्न
Name a machine for each of the following uses:
- to multiply the force,
- to change the point of application of force,
- to change the direction of force,
- to obtain the gain in speed.
उत्तर
- Shears are a tool for cutting thin metal sheets; they are a force multiplier.
- Applying force to the pedal rotates the wheel of a cycle with the aid of a chain.
- Water is lifted from the well using a bucket that is attached to a single fixed pulley.
- A set of scissors for cutting the fabric.
संबंधित प्रश्न
Answer the following.
What do you understand by a complex machine?
Answer the following in short.
Mention any two methods by which we can take care of machines.
Derive the relationship between mechanical advantage, velocity ratio and efficiency of a machine.
State the kind of lever which always has mechanical advantage less than 1. Draw a labelled diagram of such a lever.
The mechanical advantage of an inclined place is always:
(a) less than 1
(b) equal to 1
(c) greater than 1
(d) nothing can be said
Can a simple machine act as a force multiplier and a speed multiplier at the same time?
What is the relationship between the mechanical advantage and the velocity ratio for:
(i) An ideal machine,
(ii) A practical machine.
How does a machine work?
Classify the following as a lever, a pulley and an inclined plane:
Nutcrackers
Identify and mention the types of simple machines.
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| ______ | ______ | _______ |
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| ______ | ______ | ______ |
