Bastian catches for his baseball team. A warm-up toss reaches his glove at 4 m/s. The next throw reaches it at 8 m/s. It is the same ball both times.
Which throw is harder for Bastian's glove to stop?
The ball is the same, so the mass is the same. Only the speed differs.
Stopping the ball means bringing its velocity to zero.
From 8 m/s, the ball has twice as much velocity to lose as from 4 m/s.
With the same force from the glove, losing twice the velocity takes twice the time.
To stop the fast ball just as quickly instead, the glove must exert a larger force.
Either way, the 8 m/s throw is harder to stop.
Two identical hockey pucks slide across the ice, one at 6 m/s and one at 3 m/s. Which puck is harder to stop?
Celia rides the same bicycle along a path, once at 2 m/s and once at 5 m/s. In which ride is the bicycle harder to stop?
The same skateboard rolls past twice, once at 3 m/s and once at 6 m/s. In which pass is it harder to stop?
The skateboard is the same, so the mass is the same.
6 m/s is the greater speed.
The 6 m/s pass is harder to stop.
Two identical baseballs arrive at 7 m/s each. Which is harder to stop?
The masses are equal, and the speeds are equal too.
Nothing differs between the two balls.
Neither: the two baseballs are equally hard to stop.
Anouk says: 'The same soccer ball is harder to stop when it arrives at 12 m/s than when it arrives at 6 m/s.' Is Anouk correct?
Put the two lessons side by side: more mass makes a mover harder to stop, and more speed makes a mover harder to stop.
Three identical go-karts circle a track, the first at 9 m/s, the second at 6 m/s, the third at 3 m/s. Which go-kart is hardest to stop?
Two identical delivery drones fly down the same street, one faster than the other. Which feature decides which drone is harder to stop?
A van's speed doubles from 4 m/s to 8 m/s. What happens to how hard the van is to stop?