FRICTION AND ITS EFFECTS

Frictional force is a _____.

• consequential force

• gravitational force

• non-contact force

• mechanical force

The force of friction _______ with a/an ____ in the weight of a body.

• increases, decrease

• increases, increase

• decreases, increase

• decreases, decrease

Pick the correct statement(s) related to the “force of friction”.

• Increases the speed of a moving body

• Causes wear and tear in the body

• Is a conservative force

• Increases when lubricants are added to the surface

Identify the correct figure that represents 10 N force acting towards East

• Figure1

• Figure 2

• Figure 3

• Figure 4

____frictional force comes into play when a body is just about to slide or roll over a surface.

• Rolling

• Static

• Fluid

• Sliding

For the same weight, _____ frictional force is much smaller than _____ frictional force.

• sliding, rolling

• rolling, fluid

• rolling, sliding

• sliding, fluid

“Friction produces heat”. Pick the correct example for this statement.

• Sole of the shoe losing its patterns

• A meteor burning upon entering the earth’s atmosphere

• Stopping the motion of a car by applying brakes

• A ball rolling on the ground stopping after sometime

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

When an external force is applied on an object, the static fictional force is always ______ than the sliding frictional force.

• greater

• lesser

• equal to

• cannot compare

Match the following:

• {i-I, ii-II, iii-III}

• {i-II, ii-III, iii-I}

• {i-II, ii-I, iii-III}

• {i-III, ii-II, iii-I}

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

1 kgf is the force required to lift a body of mass ____ vertically upwards.

• 10 g

• 100 g

• 1000 g

• 1 g

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4