Smack a hockey puck on ice and it slides across the ice. The force that keeps it moving is:
A. gravity
B. friction
C. an interaction with the ice and the air
D. none of these
i thought it was B but i think im wrong. help please!!
2007-11-12 12:20:18 · 23 answers · asked by Anonymous in Science & Mathematics ➔ Physics
D. none of these
gravity just keeps the puck on the ice (meaning it keeps it from flying into the air)
friction a force against motion
air resistance would slow it down too.
2007-11-12 12:23:40 · answer #1 · answered by Aaron C 2 · 0⤊ 0⤋
The answer is D because momentum is the force that keeps an object in motion.
Gravity is the force that pulls objects toward the center of the Earth
Friction is the resistance caused by movement between two objects. This force slows movement down.
The reaction with ice is friction and air will cause resistance and pressure against the hockey puck.
2007-11-12 12:26:40 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I think its D. gravity doesnt make sense because gravity is the force that keeps things on the ground. Friction doesnt make sense because friction is a force that stops things from moving. "An interaction with the ice and air" is way to general to be an answer, so D is ur best bet.
2007-11-12 12:23:17 · answer #3 · answered by miggy232 3 · 0⤊ 0⤋
none of them. The ice melts slightly and makes a thin layer of WATER (a liquid) which makes less friction than solid ice. the force that keeps it moving is called inertia.
2007-11-12 12:23:38 · answer #4 · answered by Anonymous · 0⤊ 0⤋
B...I also believe, is correct...
The puck is actually 'Aquaplaning'.
Its motion across the ice DOES cause friction.
Friction causes heat.
The heat is sufficient to temporarily melt a very thin layer of ice underneath it causing it to aquaplane and resistance to its motion is very much reduced.
Immediately behind the puck, the ice re-freezes instantly.
(This is also the principle of the gliding motion of ice-skates).
2007-11-12 12:33:10 · answer #5 · answered by Norrie 7 · 0⤊ 0⤋
I think that friction would be slowing it down, which is considered gravivity. The force that keeps it moving is velocity or initial velocity. Do I would think D.
2007-11-12 12:24:16 · answer #6 · answered by Erik O 2 · 0⤊ 0⤋
it's D.
the force that keeps it moving is one of newtons laws (object in motion will continue in motion until an outside force acts upon it. in this case, the outside force is friction.)
2007-11-12 12:23:54 · answer #7 · answered by Esp 2 · 0⤊ 0⤋
Friction
i believe
2007-11-12 12:23:13 · answer #8 · answered by bring me the horizon fan/ sk8er 1 · 0⤊ 0⤋
none friction acts against it, gravity keeps it on the floor and c its also friction and wind resistance so its d
2007-11-12 12:23:41 · answer #9 · answered by Anonymous · 0⤊ 0⤋
D. none of these The real answer is inertia.
2007-11-12 12:23:08 · answer #10 · answered by Kevin U 4 · 0⤊ 0⤋