Friction

Friction is a

• non - contact force

• contact force

• electrostatic force

• magnetic force

The factors on which friction depends

• nature of the surfaces

• how hard the objects are pressed together

• both (a) and (b)

• none of these

A toy car released with the same initial speed will travel farthest on

• Muddy surface

• polished marble surface

• cement surface

• brick surface

Tags

NGSS.MS-PS3-5

It is difficult to walk on an oily floor because

• Floor gets spoiled

• There is more resistance

• Force of friction is high

• Force of friction is very less

Friction can be increased by making the surface

• rough

• smooth

• does not depend on the nature of surface

• none of these

In the figure a boy is seen pushing a box from right to left. The force of friction will act on the box

• from right to left

• from left to right

• vertically downwards

• vertically upwards

Tags

NGSS.MS-PS2-2

In a large commercial complex, there are four ways to reach the main road. One of the paths has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has a gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is

• polished marble

• bricks

• gravel

• loose soil

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?

• both requires same force

• box A

• box B

Tags

NGSS.MS-PS2-2

Which of the following materials is likely to have least friction

• Wood

• Cardboard

• Glass

• Paper

Which of the following statements is true?

• Friction pulls objects towards the centre of the earth

• Friction primarily affects the objects that contain iron

• Friction slows down or stops objects in motion

• Friction does not affect objects in motion