is useable power.
is anything that has mass and takes up space.
something that makes an object move or change direction.
resistance to movement produce when two objects are in contact with each other; the soft grass creates friction that slows down the ball.
a force that moves something away from you; pushing the shopping cart makes it move.
a force that moves something closer to you; pulling the toy makes it move.
an invisible force that pulls objects toward the center of the Earth; gravity pulls you down a slide.
a simple machine made from a bar that pivots on a fixed point; it is used to move heavy objects.
a simple machine made from a rope or cable running over a wheel; it is used to lift heavy objects.
a flat surface, such as a ramp, that is set at an angle; inclined planes are simple machines that make sliding or movingt an object easier.