Effects of Friction on a Moving Ball

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Scientific question: How does surface type affect how far a ball travels?

When a ball rolls across a surface, friction acts against its motion. Different surfaces create different amounts of friction, which changes how quickly the ball slows down and stops. In this simulation you will test five surfaces and collect data to answer the scientific question above.

Directions

  1. 1Select a surface using the buttons in the simulation below.
  2. 2Click Roll ball to release the ball down the ramp. Watch where it stops.
  3. 3Click Reset, then roll again. Complete 3 trials for each surface.
  4. 4Repeat for all 5 surfaces. Your data table fills in automatically.
  5. 5Use your completed data table to answer your lab questions.
Fair test: The ramp angle is locked at 30° for every trial — you are only changing one variable: the surface type.

Science background

Friction is a contact force that opposes motion between two surfaces. Rough or soft surfaces create more friction than smooth or hard ones. More friction means the ball loses energy faster and travels a shorter distance.

Independent variable
Surface type — the one factor being changed on purpose
Dependent variable
Distance the ball travels — what is being measured
Constants (controlled)
Ramp angle (30°), ball size, release point — kept the same every trial
Why 3 trials?
Repeating trials reduces the effect of random variation and gives a more reliable average

Surfaces from most to least friction (prediction)

Think about which surfaces feel rough or soft under your hand and which feel smooth and hard. Use that to make your own prediction before you collect data.

FrictionA force that resists motion between two surfaces in contact
ForceA push or pull that can change an object's speed or direction
Independent variableThe factor a scientist changes on purpose in an experiment
Dependent variableThe factor that is measured to see the effect of the change
ConstantA factor kept the same in every trial to make the test fair
TrialOne run of an experiment — repeated for reliable data
AverageSum of all values divided by the number of values
EvidenceData collected during an investigation that supports a conclusion

Simulation

Ramp angle locked at 30° — testing surface type only
Choose a surface:

Data table

Distance is measured from the bottom of the ramp to where the ball stops.

Surface Trial 1 (cm) Trial 2 (cm) Trial 3 (cm) Average (cm)
Remember: A longer distance means less friction. A shorter distance means more friction — the surface slowed the ball down faster.