Answer:
Please find the answer in the explanation.
Explanation:
Mention three disadvantages of friction between the parts of a machine
Three disadvantages of friction between the part of a machine are;
1. Friction causes wear and tear of machine parts.
2. Friction generates heat between the part of a machine.
3. Friction reduces the efficiency of a machine.
How does.
1 . oiling
2 using ball bearing
To reduce friction, you need to apply a lubricant. Oil and grease are examples of a lubricant. A lubricant helps to reduce friction by making the surface of the machine parts slippery thereby reducing tear and wear.
Also, friction can be reduced by using ball bearing which will allow the rolling of machine parts.
There could be a number of factors that affect the movement of surface water in sources such as, streams and rivers. These may include wind, bed slope, type of rocks, obstructions (say by vegetation), bed shape, etc.
The wind creates currents and causes motion. Bed slope or steepness of bed may also define how fast or slow the surface water will move. A steeper slope is associated with higher velocities, while a gentle slope will cause slow flow. Higher velocities will also enable movement of materials carried by river (such as silt), while slower velocities would force the settlement of such material, causing obstructions in its own path. Any obstruction in the path of water causes change of course (depending on the size or magnitude of obstructions). This can be seen in embankments and cutting by the streams. The rock types in the region and bed also affect the water motion. Another important factor related to the flow is the interaction between surface and groundwater.
link: https://www.enotes.com/homework-help/what-three-factors-describe-movement-surface-water-507498
Hope this helps.
Answer:
The phenomenon of the irregular movement of pollen grains suspended in water was observed by Robert Brown in 1827. Brownian motion, the name given to this process, was not given a rigorous mathematical treatment until almost one hundred years later by N.
Answer:
Period is proportional to (L / g)^1/2
Only the length of the string and the force of gravity will affect the motion of a simple pendulum.