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प्रश्न
Fill in the blank.
Lubricants are used to ..................... friction.
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उत्तर
Lubricants are used to reduce friction.
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संबंधित प्रश्न
Fill in the blank.
Friction ....................... the motion.
Name the type of force which act in the following case:
A comb rubbed with silk attracts the bits of paper
Which offers more friction on a body: a glass surface or a wooden surface?
Fill in the blank.
The force acting on a mango falling from a tree is an example of .....................
State if the following statement is true or false. Correct the statement if it is false.
Force applied on an object can increase its mass.
Answer the following in a word or two or in a sentence.
Give an example in which a force can change the direction of an object.
Solve the following numerical problem.
Two horses pull a cart in the same direction with a force of 500 N each. Find the resultant force acting on the cart.
Solve the following numerical problem.
Two persons are pushing a car with a force of 30 N and 70 N in opposite directions. Calculate the resultant force and its direction.
Answer the following in a word or two or in a sentence.
A child tries to slide a wooden block on the top of a table, but she is unable to get a smooth movement. What material do you suggest she should use in between the block and the table to get a smooth movement?
Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move at the same speed? Give reasons for your answer.
