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15 cards from this deck
Total momentum before = after (no external forces)
p=mvp = mvp=mv (mass × velocity)
Velocity (wider = faster, closer = slower)
u=S1n/50u = \frac{S_1}{n/50}u=n/50S1, v=S2n/50v = \frac{S_2}{n/50}v=n/50S2
p=m1up = m_1up=m1u
p=(m1+m2)vp = (m_1 + m_2)vp=(m1+m2)v
Inelastic (trolleys stick together)
Momentum only, NOT kinetic energy
None - they cancel out (Newton's 3rd law)
They are internal forces (equal & opposite)
Friction (air resistance & rolling friction)
Parallax errors
Trolley moves at constant speed
50 Hz
Box with cushion under runway to catch falling trolleys
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