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Class 8 Practice – Level 3 – Set 1 – Friction Solutions
Total questions: 15
1.
Friction arises due to the microscopic interactions between surfaces. What is the primary reason for this resistance at the microscopic level?
Surface roughness alone
Interlocking of microscopic surface irregularities and electrostatic forces
Weight of the objects in contact
Differences in temperature between surfaces
None
2.
Why is static friction generally greater than kinetic friction?
Static friction acts on stationary objects, so it requires more force
The irregularities on surfaces interlock more effectively when the object is at rest
Kinetic energy reduces frictional force when the object is moving
Moving objects have less mass
None
3.
Which condition would NOT affect the frictional force between two surfaces in contact?
Increasing the surface area of contact
Applying a greater normal force
Changing one surface to a smoother material
Applying a lubricant
None
4.
Why is it essential to minimize friction in jet engines?
To maintain high temperature levels
To maximize fuel consumption
To reduce wear and tear on moving parts and increase efficiency
To create heat for propulsion
None
5.
The coefficient of friction (μ) between two surfaces is determined by:
The normal force alone
The types of materials in contact
The speed of the moving object
The color and temperature of surfaces
None
6.
Why does friction have a negligible effect on spacecraft moving in outer space?
Spacecraft are too large for friction to act
There is no gravitational pull in space
The absence of an atmosphere means no air resistance or surface contact
Spacecraft have a self-lubricating surface
None
7.
An object is being pulled at an angle to the horizontal. Which component of the force influences frictional resistance?
The horizontal component of the applied force
The vertical component of the applied force
The total force applied
The frictional force acts independently of applied force
None
8.
If a car accelerates, how does the frictional force acting on the tires change?
Increases due to higher static friction
Decreases as speed increases
Converts from rolling to sliding friction if the tires slip
Remains constant regardless of speed
None
9.
Why do streamlined shapes reduce friction in fluids?
They eliminate drag completely
They reduce the surface area in contact with the fluid
They allow fluids to flow smoothly, reducing turbulence and drag
Streamlined shapes absorb fluid particles
None
10.
In which scenario is high static friction preferable over kinetic friction?
Sliding down a hill
Starting a car on an incline
Skating on ice
Rolling a ball on the ground
None
11.
How does fluid friction change with the speed of an object moving through the fluid?
It decreases as speed increases
It remains constant
It increases as speed increases
It depends only on fluid density
None
12.
How does friction affect the conservation of mechanical energy?
It has no impact on energy conservation
It converts kinetic energy into potential energy
It converts some mechanical energy into heat, reducing total mechanical energy
It increases total energy
None
13.
Two identical objects are moved across surfaces of rubber and glass. Why is friction likely higher on rubber?
Rubber surfaces absorb more weight
Rubber has higher inter-surface bonding with objects
Rubber is smoother
Glass increases kinetic friction
None
14.
When designing braking systems, engineers must account for:
Minimizing friction to ensure high speed
Maximizing friction for efficient stopping
Using the weakest materials to reduce wear
Reducing both static and kinetic friction equally
None
15.
Why are ball bearings used in machines?
To increase energy usage
To convert kinetic energy into heat
To reduce rolling friction and increase efficiency
To increase surface contact area
None
1 out of 15
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