Advertisements
Advertisements
Question
What care would you take to increase the life span of a machine which you use?
Advertisements
Solution
Taking care of machines: Some of the ways in which machines should be cared for are given below:
- Machines should be kept in a clean environment, which is free from dust and moisture.
- When not in use, machines should be kept covered to prevent the collection of dust on them.
- Machines made of iron should be protected from rust by coating them with paint.
- The moving parts of a machine should be regularly oiled with good-quality machine oil to reduce friction and wear and tear. The above care of machines increases their life.
APPEARS IN
RELATED QUESTIONS
State whether the following statement is True or False.
A boy does work while pushing a wall.
Can a machine be 100% efficient?
Define Mechanical advantage
Fig. shows a spade. It is being used to lift soil weighing 30N from the ground.
(a) Mark the direction of the least force on the handle necessary to keep the spade balanced.
(b) Calculate the least force on the handle necessary to keep the spade balanced (the weight of the spade is negligible).
(c) If the left hand was move towards the soil on the spade, would the force on the handle necessary to keep the soil balance the greater or less? Give a reason for your answer.
(d) To which class of lever does the spade belong?
Classify the following as a lever, a pulley and an inclined plane:
A staircase
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the third order.
Identify and mention the types of simple machines.
 |
 |
 |
| ______ | ______ | _______ |
 |
 |
 |
| ______ | ______ | ______ |
Name some simple machines.
Simple machines usually exchange a larger force to move a heavy object.
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.
