A baseball player slides into third base. As he's sliding, which one of the following force does NOT act on him?
1) static friction
2) kinetic friction
3) normal force
4) weight
5) all of the above forces act on him
2007-07-23 08:55:54 · 19 answers · asked by Anonymous in Science & Mathematics ➔ Physics
6) electron degeneracy pressure
...actually, that does apply.
2007-07-23 08:59:35 · answer #1 · answered by Anonymous · 0⤊ 0⤋
1
2007-07-23 16:13:55 · answer #2 · answered by vpi61 2 · 0⤊ 0⤋
Static friction does not act on him. The key word is sliding, which implies that the player is moving with respect to the ground. This would mean that kinetic friction is acting on him (as a result of this movement). Weight is acting on him because he is within a gravitational field. Normal force is acting on him because he is on some surface.
#5 is a preposterous answer because there is no physical situation where both kinetic and static friction can act on the same object.
2007-07-23 16:41:34 · answer #3 · answered by msi_cord 7 · 1⤊ 1⤋
static friction is the force opposing motion when the body is at rest. your question says 'as he's sliding' so he is clearly moving. static friction is higher than dynamic friction...friction always opposes motion and is lower once the body is moving.
normal force is the ground pushing back up at the player, necessary or he would sink below ground level, weight is obviously the players gravitational downward force
2007-07-27 13:31:47 · answer #4 · answered by mpgmich 2 · 0⤊ 0⤋
1) static friction
Since static means NOT MOVING and the player is sliding so he is indeed moving and kinetic friction is acting instead of static friction.
2007-07-23 16:00:54 · answer #5 · answered by Bender[OO] 3 · 0⤊ 0⤋
Static friction occurs when the ojects are not moving in relation to each other. However, in this case the player is moving, so that would rule out static. I'm not absolutely positive though...
2007-07-23 16:04:49 · answer #6 · answered by danamarin 2 · 0⤊ 0⤋
static friction does not apply if an object is sliding. static friction is the friction forces needed to get an object to start sliding. after sliding has started, it is the kinetic friction.
2007-07-23 15:59:22 · answer #7 · answered by Anonymous · 0⤊ 1⤋
Static friction. Static friction only applies to an object at rest
2007-07-23 15:59:58 · answer #8 · answered by billgoats79 5 · 0⤊ 1⤋
Static friction keeps him in his shoes.
Kinetic friction is between the soles of his shoes and the ground.
So, #5 is correct.
(PhD in Biophysics)
2007-07-23 17:45:33 · answer #9 · answered by Jerry P 6 · 0⤊ 1⤋
static friction is the friction that holds things in place. I doubt that he is stuck in place when sliding
2007-07-23 16:00:09 · answer #10 · answered by stopping the madness 4 · 0⤊ 1⤋
Static friction. It resists movement from a dead stop. This guy is moving.
Try studying your textbook, rather than having complete strangers do your physics homework.
2007-07-23 15:59:15 · answer #11 · answered by Anonymous · 0⤊ 1⤋