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प्रश्न
In the following figure, a boy is shown pushing the box from right to left. The force of friction will act on the box
पर्याय
from right to left (←)
from left to right (→)
vertically downwards (↓)
vertically upwards (↑)
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उत्तर
from left to right (→)
Explanation:
The force of friction will be from left to right (→) because the friction force always acts in opposite direction to the motion.
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संबंधित प्रश्न
Friction depends on the ______ of surfaces.
A charged glass rod attracts a charged plastic straw.
State two factors which directly affect the force of friction.
Give three examples to illustrate that friction is a necessary evil.
Define sliding friction
Arrange the following in descending order:
- static friction
- sliding friction and
- rolling friction?
A body needs a force F1 just to start moving on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is
- the static friction
- sliding friction and
- rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
State if the following statement is true or false. Correct the statement if it is false.
If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.
State if the following statement is true or false. Correct the statement if it is false.
Like charges always attract each other.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Answer the following in short.
Define force. Write its SI unit.
Answer the following in detail.
What are the various effects of force? State one example of each.
Fill in the blank.
More the roughness of a surface, greater is the ........................
Tick the most appropriate answer.
If you pour some oil onto a floor, the friction would
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?
Explain how friction can be minimized.
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other. Give reason.
Friction depends on the ______ of two surfaces in contact.
Assertion: We can live very happily if friction is not present in nature.
Reason: The airplane shape is streamlined to reduce the effort of frictional force.
