Momentum
Answers are for parents and teachers.
1
m = 5 kg, υ = 8 m/s. Momentum (kg·m/s)?
40
2
A body of mass 12 kg has momentum 60 kg·m/s. Its velocity (m/s)?
5
3
A force of 30 N acts for 2 s. Change of momentum (kg·m/s)?
60
4
Name two devices that soften impacts.
For example: airbag, bicycle helmet, sports shoe sole.
5
Why does a goalkeeper pull the hands back when catching a ball?
To lengthen the stopping time and reduce the force on the hands.