hans uses a wheelchair. although he has a ramp to get in his house he finds it difficult to get his wheelchair up the ramp. which modification would make it easier for hans to get in his house?

Question

a. increase the length of the ram
b. increase friction between the wheels and the ramp surface
c. decrease the length of the ramp
d. decrease the friction between the wheels and the ramp.

Answer 1

a, will do it.
b. if the problem he has is slipping, then b will do it also.