Question

which simple machine would make it easier to push a wheelchair onto a bus?
pulley
screw
inclined plane
lever

Explanation:

An inclined plane reduces the force needed to move an object vertically by increasing the distance over which the force is applied. This makes it easier to push a wheelchair onto a bus compared to lifting it directly. A pulley changes the direction of force but isn't ideal for this linear pushing - up motion. A screw is for rotational - to - linear force conversion (like in a vice). A lever pivots around a fulcrum and isn't designed for this kind of continuous, sloped movement.

Answer:

inclined plane