Dov and Edda each carry an identical box of books up the same staircase, from the lobby to the same second-floor landing.
Each climb transfers the same energy to the same load. Dov takes 20 s. Edda takes 10 s.
Something separates the two climbs, and it is not the energy transferred. Who transfers energy faster?
Edda does. The two climbs move the same energy, and hers takes half the time.
Now the same pair with one change: Edda climbs in 20 s too. The two climbs move the same energy in the same time, so neither transfers energy faster.
Now the first picture again: Edda back at 10 s. Same energy, less time: Edda transfers energy faster again.
Two electric winches each lift an identical crate from a dock to the same deck, transferring the same energy. The left winch takes 30 s; the right winch takes 12 s. Which winch transfers energy faster?
The scene can change completely and the test stays the same. Two forklifts raise identical pallets through the same height: the left lift takes 8 s, the right lift takes 20 s. The left lift transfers energy faster.
The deciding feature is never who strains more or who looks busier. It is the time the same transfer takes.
Two pool pumps each transfer 4000 J to the water in a storage tank. The gray pump takes 50 s; the small blue pump takes 16 s. Which pump transfers energy faster?
Both transfers move 4000 J.
The gray pump takes 50 s. The blue pump takes 16 s.
Same energy, less time: the faster transfer is the one that takes less time.
The blue pump transfers energy faster.
Two water pumps each do 3000 J of work filling the same raised tank. The first pump takes 60 s; the second takes 25 s. Dov says: 'The second pump transfers energy faster.' Is he correct?
Two escalator motors each transfer 9000 J lifting identical loads through the same rise. Each takes 30 s. Which motor transfers energy faster?
Both transfers move 9000 J.
Both take 30 s.
Same energy, same time: nothing separates the two transfers.
Neither. The two transfers are equally fast.
Two tower cranes lift identical beams from the ground to the same floor, transferring the same energy. The red crane's lift takes 14 s, and so does the yellow crane's. Which lift transfers energy faster?
Four roofers haul identical bundles of shingles from the ground to the same rooftop, each haul transferring the same energy. Their times are 40 s, 25 s, 50 s, and 30 s. Which haul transfers energy fastest?
Two loaders each do 5000 J of work raising identical feed sacks onto the same platform. The first loader takes 80 s; the second takes 35 s. Which statement is correct?
Edda and Flor each haul an identical hay bale onto the same shelf, transferring the same energy. Edda takes 12 s; Flor takes 30 s. What tells you Edda's transfer is the faster one?