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Class 8 Practice – Level 3 – Set 2 – Friction Solutions
Total questions: 15
1.
Why do anti-lock braking systems (ABS) improve safety by reducing skidding?
By increasing sliding friction
By allowing controlled static friction
By reducing friction with the road
By creating a smoother tire surface
None
2.
Why does friction generally increase in conditions with more debris, like a sandy road?
Sand particles reduce surface smoothness
Sand absorbs kinetic energy
Sand increases the normal force
Sand particles decrease weight distribution
None
3.
How do parachutes utilize fluid friction for a safe landing?
By decreasing gravitational pull
By reducing weight
By increasing air resistance
By creating static friction
None
4.
In a frictionless environment, such as outer space, what effect would pushing an object have?
The object would move at constant velocity indefinitely
The object would come to a stop
The object’s speed would continuously increase
The object would return to its original position
None
5.
How does adding weight to an object affect the frictional force it experiences on a flat surface?
Increases friction proportionally to the added weight
Decreases friction as weight increases
Has no effect on frictional force
Increases friction exponentially
None
6.
Why are rolling friction and sliding friction different?
Sliding friction is independent of surface smoothness
Rolling friction involves less direct contact
Sliding friction requires less force to overcome
Rolling objects create static friction
None
7.
How do spacecraft avoid excessive frictional heating during re-entry?
Using air resistance to slow down
Having heat shields to absorb and dissipate heat
Reducing weight
Increasing speed
None
8.
Why do runners and athletes often prefer rubber-soled shoes?
Rubber decreases normal force
Rubber increases friction, preventing slips
Rubber has no frictional effect
Rubber is less durable
None
9.
If an object experiences a frictional force of 50 N and needs to move at a constant velocity, what should be the applied force?
Less than 50 N
Exactly 50 N
More than 50 N
Zero
None
10.
Lubricants generally reduce which type of friction first?
Fluid friction
Rolling friction
Static friction
Air resistance
None
11.
Why are air cushions used in hovercrafts?
To eliminate gravity
To reduce friction with the ground
To increase normal force
To increase fluid resistance
None
12.
How does the angle of an inclined plane affect frictional force?
Friction decreases as the angle increases
Friction increases with the angle
Friction remains the same
Friction becomes negligible
None
13.
In which direction does friction act for a car taking a circular turn on a road?
Along the car’s motion
Opposite to the car’s motion
Towards the center of the turn
Away from the center of the turn
None
14.
How does excessive friction affect a machine’s energy efficiency?
Increases efficiency by generating heat
Has no effect on efficiency
Reduces efficiency by converting useful energy into heat
Makes the machine operate faster
None
15.
When friction acts on a moving object, its momentum:
Increases over time
Remains constant
Decreases over time
Becomes zero immediately
None
1 out of 15
Time's up
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