Physics Help: Ideas in the problem set in Physics

Ideas in Physics. Happy Solving!!!

1. Momentum is the product of mass and velocity.
2. The centripetal force in a uniform circular motion is equal to the product of mass and the square of the velocity over radius.
3, Pressure is equal to the density multiplied to the acceleration due to gravity and multiplied to the height.

Enjoy Physics!

Parada National High School Physics: Submission December 13, 2012

Physics: Newton's Third Law of Motion

Imagine that you are holding a box weighing 5 N at rest on the palm of
your hand.  Complete the following:
a) A downward force of magnitude 5 N is exerted on the box by
_____________________
b) An upward force of magnitude _______ is exerted on
__________________ by the hand.
c) Is the upward force (b) the reaction to the downward force (a)?
d) The reaction to force (a) is a force of magnitude _________, exerted
on__________ by __________________.  Its direction is
_______________.
e) The reaction to force (b) is a force of magnitude _________, exerted
on__________ by __________________.  Its direction is
_______________.
f) That the forces (a) and (b) are equal and opposite is an example of
Newton’s _____________ law.
g) That the forces (b) and (e) are equal and opposite is an example of
Newton’s _____________ law.
Suppose now that you exert an upward force of magnitude 7 N on the box.
h) Does the box remain in equilibrium?
i) Is the force exerted on the box by the hand equal and opposite to the
force exerted on the box by the earth?
j) Is the force exerted on the box by the earth equal and opposite to the
force exerted on the earth by the box?
k) Is the force exerted on the box by the hand equal and opposite to the
force exerted on the hand by the box?
Finally, suppose that you snatch your hand away while the box is moving
upward.
l) How many forces then act on the box?
m) Is the box in equilibrium?


Source: http://www.phys.cwru.edu/courses/p115/practice/Newton_Laws.pdf
University Physics by Freedman