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Driving Test
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CBSE
Class 8 Science
Friction
Quiz 2
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Ball-bearings are used to convert static friction into:
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drag
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sliding friction
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rolling friction
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none of these
Explanation
Ball-bearings are used to convert static friction into rolling friction.
To convert the static, sliding friction into rolling friction, the heavy luggage carriers are attached with at their base.
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ball-bearings
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chains
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tyres
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wheels
Explanation
To convert the static, sliding friction into rolling friction, the heavy luggage carriers are attached with wheels at their base, wheels decrease the friction.
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below - Choose the correct arrangement:
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rolling, static, sliding
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rolling, sliding, static
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static, sliding, rolling
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sliding, static, rolling
Explanation
The decreasing order is static, sliding and rolling.
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:
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wet marble floor, dry marble floor, newspaper and towel
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newspaper, towel, dry marble floor, wet marble floor
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towel, newspaper, dry marble floor, wet marble floor
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wet marble floor, dry marble floor, towel, newspaper
Explanation
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.
The force of friction between two bodies is:
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parallel to the contact surface
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inclined at 30° to the contact surface
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perpendicular to the contact surface
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inclined at 60° to the contact surface
Explanation
The force of friction between two bodies is parallel to the contact surface.
A coin pushed on a table stops because:
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no force acts on it
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it is very heavy
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the table exerts a frictional force on it
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the earth attracts it
Explanation
A coin pushed on a table stops because the table exerts a frictional force on it.
The main cause of wear and tear of machine is:
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poor quality of machine
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friction acting between different moving parts
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gravitational force of earth
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none of these
Explanation
The main cause of wear and tear of machine is friction acting between different moving parts.
Ball rolling on the floor stops due to:
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muscular force
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gravitational force
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magnetic force
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frictional force
Explanation
Ball rolling on the floor stops due to frictional force.
What type of friction is applied in the case of pushing a wooden box?
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Static friction
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Sliding friction
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Limiting friction
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Rolling friction
What do we call the resistance offered by fluids?
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Drag
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Lubricant
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Spikes
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Rolling friction
What type of the body reduce the fluid friction?
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Scaly
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Soft
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Streamlined
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Moist
What friction produces to light up the matchstick?
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Air
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Water
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Soil
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Heat
Which of the following offers a low friction?
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Road
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Ice surface
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Both I and II
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None of these
What is the appropriate type of friction applied when a person Sitting on a chair
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Static
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Sliding
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Rolling
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None of the above
Force of friction is
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Non-contact force
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gravitational force
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contact force
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electrostatic force
What is the friction in action when Pushing a wooden box
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Static friction
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Sliding friction
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Rolling friction
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None of the above
A toy car released with the same initial speed will travel farthest on
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muddy surface
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brick surface
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cemented surface
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polished marble surface
What is the friction in play when Throwing a ball in the bowling game
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static
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sliding
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Rolling
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None of the above
Friction can be increased by
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making the surface rough
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adding lubricant to the surface
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Make the surface smooth
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None of the above
airplanes has the shape of which animals to reduce friction?
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Snake
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Bird
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Leopard
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None of the above
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