An object slides down a very smooth ramp,
with negligible friction. It slides with constant
acceleration a under the action of two forces:
the supporting force n exerted by the ramp,
and the force mg due to gravity exerted by
the earth.
What can you say about how the magnitude
of n compares to the magnitude of m g?
1. n is greater than mg.
2. None of these
3. n is less than m g.
4. Their magnitudes are equal, as is almost
always true on the earth's surface.