Reason – The data for Team 3 shows that as the pendulum length increases from 50 cm all the way to 80 cm, the time to make 10 swings first decreases, then increases, then remains the same.

Student C

Conclusion – I conclude that as the length of a pendulum increases, the time it takes to swing back and forth 10 times decreases.

Reason – The longer the pendulum, the closer it is to the ground, where gravity is stronger. Stronger gravity pulls the pendulum more quickly.

Student D

Conclusion – I conclude that as the length of a pendulum increases, the time it takes to swing back and forth 10 times also increases.

Reason – Team 5 showed that as the pendulum length increased from 50 cm to 60 cm to 70 cm to 80 cm, the time for 10 swings increased from 14.0 s to 15.5 s to 16.8 s to 18.2 s.

Student E

Conclusion – I conclude that as the length of a pendulum increases,

the time it takes to swing back and forth 10 times also increases.

Reason – Longer things move more slowly than shorter things.