Homework Help: PHYSICS

Posted by JJ on Saturday, November 20, 2010 at 6:57pm.

Indentify the direction of the netforce in each of the following situations.

A marble moves in a circular path inside a paper plate at a constant speed.

The moon orbits the earth.

An air hockey puck moves smoothly across the air hockey table after being struck.

A rocket is launched upward from the launch pad.

Thank You

PHYSICS - Damon, Saturday, November 20, 2010 at 7:18pm
There is a net force inward on the marble m v^2/R

There is a net force inward (toward earth) on the moon
m v^2/R

there is no net horizontal force on the puck. It is not accelerating.

There is a net force up on the rocket
F = change of momentum per second = mass per second of exhaust * speed of exhaust

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