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Question
Select the correct alternative:
Wheel is used with axle because
Options
sliding friction is less than the roffing friction
rolling friction is less than the sliding friction
they work as the inclined plane
They help us to change the direction of force.
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Solution
rolling friction is less than the sliding friction
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What are the wheel and axle? Give two examples.
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Name the machine to which the following belong:
Doorknob
Select the correct statement :
(a) A wheel barrow is a lever of class I.
(b) The efficiency of a machine is always 100%
(c) Friction in moving parts of a machine reduces its efficiency.
(d) No lever has the mechanical advantage greater than 1.
(e) It is easier to lift a load vertically up than to push it along an inclined plane.
(f) A screw is made by two inclined planes placed together.
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A rotation spindle tap is an example of a wheel-and-axle arrangement.
Match.
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| 2. | Pulley | Bicycle |
| 3. | Class I lever | Nut cracker |
| 4. | Wheel and axle | Wind |
| 5. | Renewable resource | Seesaw |
