Friction Quiz

What is the direction of friction?

• along the motion

• against the motion

• does not depend on motion

• can't say

Why do tyres have grooves?

• for streamlining

• design looks good

• to reduce friction

• to increase friction

What is the cause of friction?

• irregularities in the surface

• interlocking of irregularities

• inter-particle forces

• gravitational forces

What device can be used to measure friction?

• beam balance

• hydrometer

• spring balance

• weighing machine

What are the types of friction experienced by a moving car?

• rolling friction

• sliding friction

• both

• can't say

Select the factor(s) on which friction depends on:

• surface area of two surfaces

• nature of two surfaces

• force with which the two surfaces are pressed together

• mass of the two bodies in contact

Arrange the types of friction in ascending order of frictional force: sliding, static and rolling friction.

• static < sliding < rolling

• static < rolling < sliding

• rolling < sliding < static

• sliding < static < rolling

How does the fidget spinner toy rotate so smoothly?

• Lubricated with oil
• Made of lightweight materials
• high-quality ball bearings cause rolling friction (which is low)

• Powered by a small motor

Which Is it easier to move a stationary or keep a moving object in motion? Why?

• It depends on the weight of the object
• It is equally easy to move a stationary or keep a moving object in motion
• Move a stationary object
• Keep a moving object in motion

What is the main form of energy produced by the friction between two surfaces?

• sound energy
• heat energy
• kinetic energy
• light energy