which has greater momentum?

Question

An old freight train at rest or a roller-skate moving downhill?

Answer 1

Train has greater inertia. Skate has greater momentum (moving)

Answer 2

The roller skate - momentum = mass x velocity. A freight train at rest, while having a lot more mass than a roller skate, has zero velocity hence zero momentum.

Answer 3

A ROLLING roller skate, the train is at rest so it cannot have momentum

Answer 4

probably the train because it's mass is so much larger than the roller skates. Also, it depends on how fast the skates are moving

momentum = velocity x mass

Answer 5

C. Both carts are discipline to the equal drive. F=ma and given that F is the equal for each carts m1a1=m2a2. If m1 is 2kg and m2 is one million kg then a1 (the acceleration of the 2kg mass) can be one million/two the acceleration of the 1kg mass. Since they had been to begin with at leisure the method for the pace is V=at. For any given time interval, t, the pace of the 2kg mass can be one million/two the pace of the 1kg mass. Since momentum is mass instances pace and the 2kg mass can have one million/two the pace of the 1kg mass at any factor in time after the spring is published they usually each had 0 momentum earlier to the spring liberate the difference in momentum at any given time can be same in significance and reverse in path. The sum whole momentum difference for the complete procedure can be 0 (conservation of momentum) however the query isn't asking the sum whole of the procedure it's asking approximately the indivdual momentum difference of every cart thererfore C might be the right reply.

Answer 6

if the train is at rest, its momentum is zero. the skate's momentum is greater than zero, since it's moving.

Answer 7

zero velocity times a really large mass = zero momentum
Not so high velocity times not such a large mass = a little momentum
But even a little momentum is greater than zero