1.
speeds up, slows down or changes direction
2.
speed needed at the top of a loop for a car to make it through the loop without falling off the track
4.
a force caused by a rubbing motion between two object
5.
short for gravitational force. the force exerted on an object by the Earth's gravity at sea level.
7.
a force that draws any two objects toward one another.
8.
the energy of an object in motion, which is directly related to its velocity and its mass.
9.
the energy stored by an object ready to be used. (In this lesson, we use gravitational potential energy, which is directly related to the height of an object and its mass.)
10.
how fast an object moves. the distance that object travels divided by the time it takes.
11.
a combination of speed and the direction in which an object travels.
