Three forces act on a box on an inclined plane as shown in the diagram below. [vectors
are not drawn to scale]
if the box is at rest, the net force acting on it is equal to
-the weight
-the normal force
-friction
-zero

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .