Question

which of the following is a machine that decreases force by increasing distance? saved car jack screw ramp hammer question #4 since work will remain the same, a decrease in force requires a decrease in distance no other changes distance to remain the same an increase in distance

Explanation:

A ramp is an inclined - plane which is a simple machine. According to the work - energy principle, work \(W = F\times d\) (where \(W\) is work, \(F\) is force, and \(d\) is distance). When work is constant, increasing the distance \(d\) will decrease the force \(F\). A ramp increases the distance over which a load is moved, thus decreasing the force required. A car jack multiplies force in a different way (using a screw - like mechanism or hydraulic system), a screw is used for fastening and can multiply force through its thread, and a hammer is used for driving and striking, not for decreasing force by increasing distance. For the second question, since \(W = F\times d\) and \(W\) is constant, a decrease in \(F\) requires an increase in \(d\).

Answer:

1. C. Ramp
2. D. An increase in distance