Factors Affecting Friction
Trending Questions
What causes friction?
What are some of the most common examples of helpful friction?
- False
- True
State the energy changes in the following while in use:
A steam engine.
Frictional force acts between two bodies even when they are not in contact.
True
False
- False
- True
A piece of paper takes much longer to fall than a stone through the same distance. Explain the reason.
Two identical rectangular strips, one of copper and the other of steel, are riveted to form a bi-metal strip. On heating, the bi-metal strip will
Bend
Twist
Elongate
Shorten
Neha has to push a light weight box and Sohit has to push a heavier box on the same floor. Which of the following is true?
It runs out of push
It rubs against the ice
It runs out of electricity
Force of gravity made it slow
Name the energy transformation takes in the following instruments.
I. Steam engine
A bucket of soapy water has been accidentally spilled on a marble floor. Which of the following statements is correct?
It will be difficult to walk after the spilling because force of friction increases
It will be difficult to walk after the spilling because force of friction decreases.
It will be easier to walk after the spilling because force of friction increase
It will be easier to walk after the spilling
People slip when they step on a banana peel. Which of these is a possible reason?
Banana peel provides less friction
Banana peel provides more friction
None of these
Banana peel provides no friction
- temperature
- surface roughness
- intemolecular interactions
- mass of objects
- equal to
- greater than
- less than
- Object speed
- Object shape
- Fluid nature
- Fluid colour
Towards left
Towards right
Which of the following method increases friction ?
Grooving
Streamlining
Lubricating
Using rollers
- Iron
- Blood
- Muscles
- Calcium
- Carbon
- Bones
- Lungs
- Oxygen
- object A = 25 kg
- object B = 50 kg
- object C = 75 kg
- object D = 125 kg
- R > Q > P
- P > Q > R
- P > R > Q
- Q > P > R
Two blocks of iron of different masses are kept on a cemented floor as shown in Fig.12.2. Which one of them would require a larger force to move it from the rest position?
Fig. 12.2
Fluid friction is
- An airplane flying in atmosphere
- A rock rolling down a mountain
- The Moon revolving around Earth
- A person swimming in river
The friction will change if the above object is dragged along the top surface instead of the bottom.
True
False
- A rock rolling down a mountain
- An airplane flying in atmosphere
- A person swimming in river
- The Moon revolving around Earth
- Ball bearings
- Grease
- Powder
- Oil
- Spikes
- Wheels
- Polishing
- Sand
- Interlocking
- All of the above
- Adhesion
- Plowing effect
When we put cup upside down in a bucket filled with water, and when we take it out it is little bit difficult. Why?
- A person swimming in river
- The Moon revolving around Earth
- An airplane flying in atmosphere
- A rock rolling down a mountain