2007-10-23 21:02:13 · 5 answers · asked by triplel R 1 in Science & Mathematics ➔ Physics
friction is related to the force that is perpendicular to the surfaces that are touching. In this case, friction is related to the sum of the forces, one being the force of gravity pulling the block toward the surface, the other being any applied force.
Short answer, pressing down on a body increases the friction.
This is of course assuming that there are forces in play that friction can act against.
If you have a brick sitting on a flat table, and press down directly on it, there is no increase in friction because there isn't anything for friction to act against. It would only come into play if something was at the same time trying to move the block sideways.
2007-10-23 21:09:05 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Friction is the force of two surfaces in contact. It is not a fundamental force, as it is derived from electromagnetic forces between atoms
sliding friction is not caused by surface roughness, but by chemical bonding between the surfaces.
Pressing down on a 'block' affect these forces and hence the frictional forces.
2007-10-23 22:09:21 · answer #2 · answered by Pearlsawme 7 · 0⤊ 0⤋
Quantitatively, increasing the normal force, that is pressing down a body, increases the frictional force.
The question of "How" is quite difficult to answer because it leads to qualitative answer. You cannot see the molecules of the body between the two surfaces in contact. You do not have x-ray eyes to observe it.
2007-10-23 21:15:36 · answer #3 · answered by rene c 4 · 0⤊ 0⤋
This is kind of a vague question but i will answer it in its raw form.
It does not "block" the frictional force but mearly gives more force in the downward direction.
More force in the downward direction will prevent lateral movement.
2007-10-23 21:08:40 · answer #4 · answered by cryptotich 3 · 0⤊ 0⤋
it is sleep paralysis and that's common. The human physique is going into paralysis once you attain a definite point of REM sleep as a protection mechanism. It keeps you from hurting your self via appearing out on your desires. each so often you sense the paralysis while your physique wakes up yet your suggestions continues to be in REM mode.......while this happens, stay calm and your suggestions will wake itself up.
2016-12-15 07:56:31 · answer #5 · answered by ? 4 · 0⤊ 0⤋