Increasing and Decreasing Friction
Trending Questions
- Applying lubricant between surfaces
Using powder between surfaces
- Using ball bearings
- Making the surfaces more irregular
Four children were asked to arrange forces due to rolling, static, and sliding frictions in decreasing order. Their arrangements are given below. Choose the correct arrangement.
rolling, static, sliding
rolling, sliding, static
static, sliding, rolling
sliding, static, rolling
Why is it difficult to walk on a smooth and wet floor?
- True
- False
We have two identical metal sheets. One of them is rubbed with sandpaper and the other with ordinary paper. The one rubbed with sandpaper shines more than the other. Give reason.
- Applying lubricant.
- Applying powder on carrom board.
- Making shoes with spikes.
- Adding wheels to a sliding cart.
- decrease
- disappear altogether
- increase
- will remain unchanged
People slip if they step on a banana peel while walking. Which of these is a possible reason?
Banana peel reduces friction.
Banana peel has no effect on friction.
- Banana peel increases friction.
Banana peel first increases friction and then decreases it after sometime.
i) Friction acts on both liquids and gases.
ii) Friction is only an evil.
iii) Fluid friction is least for streamlined objects.
- using ball bearings
- streamlining the shape of the object
- using lubricaants
- increasing the density of the fluid
- Static friction > Rolling friction > Sliding friction
- Static friction > Sliding friction > Rolling friction
- Rolling friction > Sliding friction > Static friction
- Sliding friction > Static friction > Rolling friction
i) Both liquids and gases exert pressure.
ii) Friction is only an evil.
iii) fluid friction is least for streamlined objects.
- Only (I) and (ii)
- Only (ii) and (iii)
- Only (iii)
- Only (ii)
- ball bearings
- grooves
- spikes
- oil
- grease
- water
- sand
- True
- False
- False
- True
- Air
- Vacuum
- Water
- Honey
- False
- True
- rolling
- static
- kinetic
- fluid
- rolling
- static
- less
- more
- Ball bearings
- Polishing
- Oil
- Powder
- Grease
- Spikes
- Sand
- Wheels