Question

Which would best reduce the amount of energy needed to pull a wagon up a ramp?

1.Increasing the slope of the ramp
2.Reducing the friction between the wagon wheels
3.Reducing the length of the wagon handle
4.Increasing the friction between the wagon wheels

Answer 1

2. reducing the friction between wagon weels

Answer 2

2.Reducing the friction between the wagon wheels

Step-by-step explanation:

If the friction between the wagon wheels and the rail is reduced, then less force will be needed to pull the wagon up. This is because the friction force goes in the opposite direction of the movement, that is, friction force opposes the desired movement, making it more difficult.