Factors Affecting Friction
Trending Questions
If we apply oil on door hinges, the friction will
increases
decreases
disappear altogether
will remain unchanged
- Materials of the bodies in contact
- Roughness of the surfaces in contact
- Mass of the objects
- Amount of surface area in contact between the moving bodies
- Friction opposes motion.
- Friction increases by making surfaces rough.
- Friction generates heat.
- Friction supports motion.
What is fluid friction? Write the factors on which fluid friction depends?
- static friction
- sliding friction and
- rolling friction?
Parts of a machine that move or rotate quickly on another surface wear out due to:
2000 N
155.5 N
100 N
111.1 N
- Adhesion
- Interlocking
- Plowing effect
- All of the above
When does an object experience more friction, while sliding on a wooden surface or sliding on a glass surface?
Why is a machine not 100% efficient?
Different parts of the machine are not smooth and rigid
String in it (if any) is not perfectly elastic
Moving parts are not weightless
All of the above
- static friction
- sliding friction
- rolling friction
- fluid friction
What is the reason for the heat being produced when we rub our hands?
- Magnetism
- Gravitation
- Friction
- Both B and C
You might have noticed that when used for a long time, slippers with rubber soles become slippery. Explain the reason.
- The shape of the body moving through the fluid.
- The speed of the body moving through the fluid.
- The density of the fluid.
- The colour of the fluid.
- less area of contact
- size
- all of the above
- more area of contact
- Increase smoothness and sportsmen can have more fun
- Increase the traction between the shoes and the ground
- Decrease the gravitational force between sportsmen and floor
- None of these
A good amount of useful energy is wasted as heat in various machine parts. Why?
Because of gravity.
Because of Non-contact forces.
Because of friction.
None of the above.
When the cutting edge of a knife is put against a fast rotating stone to sharpen it, sparks are seen to fly. Explain the reason.
Why is heat produced when we rub two objects?
Q. State the principle of a thermometer.