Two-force-plate recording revealed individual left-right impulse asymmetries in student jumps while total takeoff and landing impulses remained comparable¶

Claim · All claims
Evidence · 1 study (2 entries) · design r1–r2 · q2
Currency · newest study 2007 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? In Kristina's jumps, the takeoff impulse was dominated by the left foot while the right foot dominated the landing, suggesting tilting during the jump. → Barber et al. 2007 q2 i? In Rose's jumps, the right foot provided the most impulse on both takeoff and landing, suggesting right-foot dominance or a strength or length imbalance. → Barber et al. 2007 (2) q2 i? Total takeoff and landing impulses compared reasonably well for both jumpers, giving the authors confidence in the measurements. → Barber et al. 2007

Evidence¶

Barber et al. 2007¶

Barber, R. P., Jr., Popalisky, D. J., Hacking, R., & Chiapella, K. (2007). Newton's 2nd Law and the Physics of Dance. arXiv:0706.2717. doi:10.48550/arXiv.0706.2717

q2 · i? · the article prints no effect size for this finding · design · r2

Student-conceived final project analyzing two vertical jumps by Kristina recorded on two force plates, with per-foot impulses computed and labeled in figure 4. The authors note "the impulse beginning the jump is dominated by the left foot where the right foot dominates the landing" and that total takeoff and landing impulses were comparable.

"Note that the impulse beginning the jump is dominated by the left foot where the right foot dominates the landing. This observation suggests that perhaps Kristina is tilting during the jump."

Barber et al. 2007 (2)¶

Barber, R. P., Jr., Popalisky, D. J., Hacking, R., & Chiapella, K. (2007). Newton's 2nd Law and the Physics of Dance. arXiv:0706.2717. doi:10.48550/arXiv.0706.2717

q2 · i? · the article prints no effect size for this finding · design · r1

Figure 5 shows Rose's jumps, where the right foot dominates impulse on both takeoff and landing; the authors offer right-footedness, leg-length difference, or muscular stretch/strength imbalance as possible explanations, again noting comparable total takeoff and landing impulses.

"In her case the right foot provides the most impulse on both takeoff and landing, suggesting that she is right-footed or one leg is longer than the other."

Discussion¶

Related Claims¶

• The authors report that the kinesthetic experience enhances student understanding and that a student project provides evidence of the approach's effectiveness — a broader claim this one bears on
• Overlaying mass times calculated acceleration with net force from force plates provides a compelling visual connection to Newton's Second Law — related
• Student video analysis of vertical jumps yields a free-fall acceleration estimate close to the local value of g — related