Question

If the normal pushing force of 25 LBS is required to push a wheel chair on a level floor for 160 lbs patient, calculate the pushing force of the wheelchair carrying 160 LBS weight when the ramp angle is 20 degrees.

Answer 1

We require 25 lbs normally

But if the ramp is incline than

We have to manage some extra forces

We know value of g (gravitational constant)= 10N

And also we know that $1N = 0.224 lbs$

So $10N = 2.24 lbs$

Now

we require force

That is

Force component by patient weight + force component of g + force required before

$\boxed{160sin20^o+2.24sin20^o+ 25}$

$\boxed{= 80.16 lbs}answer$

to take the wheel chair up the incline ramp.