Question 2 :
You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor?
Question 4 :
What happens to the strength of frictional force when logs are lifted by placing logs under it?
Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d072f59b460d7261f2f1.PNG' />
In the above image, Two blocks of iron of different masses are kept on a cemented floor.Which one of them would require a larger force to move it from the rest position?
Question 6 :
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force?
Question 7 :
What is easier to move the box from rest, or to move it when it is already in motion?
Question 9 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d071f59b460d7261f2f0.PNG' />
In the above image, While playing tug of war Preeti felt that the rope was slipping through her hands. Which of the following is a way out for her to prevent this?
Question 11 :
Spring balance consists of ________ which gets stretched when a force is applied to it.
Question 13 :
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor . Who will have to apply a larger force?
Question 14 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d070f59b460d7261f2ef.PNG' />
In the above image, a boy is shown pushing the box from right to left.The force of friction will act on the box
Question 15 :
The frictional force also depends on the _____ of the object and the _______ of the fluid respectively.
Question 16 :
Friction opposes the _________________ between the surfaces in contact with each other.
Question 17 :
A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest, he may
Question 19 :
The handle of a cricket bat or a badminton racquet is usually rough. Which of the following is the reason for it?
Question 20 :
When the cutting edge of a knife is put against a fast rotating stone to sharpen it, sparks are seen to fly due to which of the following reason(s)?