What makes simple machines useful for people without enough strength to
complete a task?
a) work is reduced, while time is decreased.
b) input force is reduced, while time is increased,
c) power is creased, while distance is decreased. d) input force is reduced, while distance is increased.

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.