IBC Quiz #191
06/02/2026
HARSHAAN D
Class 8
HIS-G
Deepthi Priya R
Class 8
DDPS
N.Srikruthi
Class 4
Swargarani School & P.U College
N.Rudraansh
Class 4
Swargarani School & P.U College
Santhosh
Class 8
Preethi Public school
Rekha CM
Class 8
GR International public school
Akash
Class 8
Royal english medium school
Unnathi gowda k.v
Class 8
Bhavishyath public school
Venkat
Class 8
National Public School
Aishani Bhat
Class 4
KSVK International School
Note: Quiz prizes will be awarded to ten randomly selected students who submit correct answers before the deadline. Winners will be declared on the website and the weekly newsletter.
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Previous Week Quizzes
IBC Quiz #191
February 06, 2026
Scenario
A researcher tests the efficiency of rolling motion on different industrial surfaces. Four identical solid steel spheres (mass = 1.0 kg, radius = 0.05 m) are tested on different 100-metre tracks.
Each sphere starts from rest, receives a brief push gives it an initial velocity of 4 m/s, and then rolls freely without slipping until friction brings it to a stop, or it completes the 100-metre distance.
Given:
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All spheres are identical solid spheres
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Initial velocity: v₀ = 4 m/s
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Distance: 100 metres.
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g = 10 m/s²
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Air resistance is negligible
Assume:
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Rolling occurs without slipping
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Energy loss is only due to rolling friction
Hint: Consider both the distance a sphere can travel before stopping and the time it takes to cover 100 metres to determine which spheres cross the track and which finishes fastest.
Question
Which spheres successfully cross the 100-metre track and which finishes fastest?
Scenario
A researcher is testing the efficiency of rolling motion for solid steel spheres across different industrial floor materials. Four identical solid metal spheres (mass = 0.5 kg, radius = 0.03 m) are tested on four different horizontal tracks, each 100 metres long.
Each sphere is given a brief push to start it at a specific initial velocity. The experiment aims to determine which surfaces allow the spheres to overcome rolling friction and cross the 100-metre finish line.
Given:
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All spheres are identical solid spheres
-
Distance: 100 metres
-
g = 10 m/s²
-
Air resistance is negligible
Assume:
-
Rolling occurs without slipping
-
Energy loss is only due to rolling friction
Question
Based on the data provided, which sphere(s) successfully cross the entire 100-metre track?
IBC Quiz #190
January 30, 2026
A student performs an experiment to study the forces exerted on the ground when four different blocks are dropped vertically from rest onto a rigid horizontal surface. A force sensor fixed to the ground measures the average impact force during the short time in which each block comes to rest after hitting the ground. The student wants to ensure that the stopping time (Δt) is exactly 0.040 s for every impact, regardless of the block's mass.
Assume:
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Acceleration due to gravity, g = 9.8 m/s²
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Air resistance is negligible.
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Each block falls freely before impact.
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Each block comes to rest uniformly during impact.
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The stopping time depends only on the impact velocity and can be kept constant at 0.040 s by adjusting the drop height.
Question
To achieve a constant stopping time of 0.040 s for all blocks, how should we rank the drop heights and which block will exert the maximum average impact force on the ground?
A student performs an experiment to compare the force exerted on the ground when different blocks are dropped vertically from various heights onto a rigid surface. A force sensor fixed to the ground measures the average impact force during the short time in which each block comes to rest after hitting the ground.
Assume:
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Acceleration due to gravity, g = 9.8 m/s²
-
Air resistance is negligible
-
Each block comes to rest uniformly during impact
Question
Which of the following blocks exerts the maximum force on the ground based on the experimental data?
