[ 555 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • _________ • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • C Which of the graphs correctly depicts constant positive velocity? A Position Position Time B D Position Position Time Time Time Work is a force acting on an object to move it across a distance. Inclined planes make work easier by providing a smooth surface for objects to slide or roll across. Pushing a stroller up a ramp is easier than pushing it up a flight of stairs. When going down a ramp, the gravitational pull on the stroller may be all that the stroller needs to begin rolling and gain velocity. The velocity of a moving object can be determined by the following formula: velocity = distance time If a stroller travels with a forward velocity of four m/s for a time of two seconds, then the distance covered is ___________ meters. (You may use a calculator to complete this question.)