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Energy/Simple Mach.

7th Grade Science Test Questions

QuestionAnswer
As a roller coaster car travels down a hill, which type of change in energy allows it to speed up? potential energy changing into kinetic energy
Which form of energy does a car’s engine convert into mechanical energy? Chemical (gasoline)
Which type of energy is changed by plants into chemical energy? Solar Energy (Sun = Photosynthesis for plants)
Which simple machine would be the most efficient for lifting an object 30 m off the ground? A pulley B screw C wedge D lever Pulley
Which simple machine would most likely increase the distance and reduce the force needed for a rolling cart to be moved up three steps? inclined plane
The mechanical advantage available from a pulley could best help in which situation? a.pushing a car b.rotating a wheel c.flying an airplane d.lifting an elevator lifting an elevator
A _________________ machine is made up of two or more simple machines compound
Which energy-conversion process occurs whenever coal is burned? a.chemical to thermal b.chemical to electrical c.mechanical to thermal d.mechanical to electrical chemical to thermal
Energy that is doing work is called: Kinetic
Stored Energy Potential
Light is an example of _________. Radiant Energy
Created by: MrsCharity