Nature of Surface in Contact
Trending Questions
Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be
wet marble floor, dry marble floor, newspaper and towel.
newspaper, towel, dry marble floor, wet marble floor.
towel, newspaper, dry marble floor, wet marble floor.
wet marble floor, dry marble floor, towel, newspaper
A toy car released with the same initial speed will travel farthest on
muddy surface
polished marble surface
cemented surface
brick surface
- Glass tumbler
- Sand paper
- Uneven rock
- Silk cloth
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other. Give reason.
Four identical wooden blocks are slid with same initial velocities on four different horizontal surfaces - sand, concrete, clay and ice. On which of these surfaces, will the distance travelled be maximum?
Sand
Ice
Clay
Concrete
Friction also depends on the smoothness of the surface, even if the material is same
True
False
Arrange the following surfaces in increasing order of surface roughness:
- Wooden
- Metal
- Cloth
- Wooden < Metal < Cloth
- Metal < Wooden < Cloth
- Wooden < Clock < Metal
- Cloth < Metal < Wooden
- Two smooth plates
- Two rough plates with oil in between them
- Two rough plates
- Two rough plates pressed against each other
The magnitude of friction depends on
Irregularities on the surface
Density of the objects
Normal reaction between surfaces
Weight of an object
While travelling on a rickshaw, you might have experienced that if the seat cover is very smooth, you tend to slip when brakes are applied suddenly. Explain.
