#### Physics Set 5

Mass of Earth:

5.98 x 10^24 kg

6.38 x 10^6 m

Density of Earth:

5.52 x 10^3 kg/m^3

Mass of Sun:

1.99x10^30 kg

What is gravity at the center of Earth's mass?

g = 0

What is centripetal force?

force applied on an object moving in a spinning motion

What is the equation for centripetal force?

F = mac

As the distance increases away from the Earth, does force increase or decrease?

As the distance increases away from the Earth, force decreases (vice versa)

What is work?

the product of force and displacement of any object

Where does the work formula derive from?

Newton's Second Law

What is the formula for work?

W = F • d (Work = Force • diplacement/distance)

What is power?

rate of doing work

What is the equation for power?

power = work/time

One person finishes work in 1 hr, the second person finishes work in 2 hours. Who has more power? Why?

Person 1, who finished in 1 hrMore efficiency = more power

Does more efficiency, give more or less power?

more power

Are potential energy and kinetic energy interchangeable?

Yes

What does it mean when potential energy and kinetic energy are interchangeable?

Loss of one = Gain of other (vice versa)

Which Law does the interchangeability of kinetic and potential energy derive from?

Law of Conservation of Energy

Gain of KE formula (kinetic energy):

Gain of KE = mgh - fh

What is fh?

frictional force

If an object moves up vertically and then moves right horizontally, is this kinetic or potential energy?

Kinetic energy, because it finished moving right horizontally

If an object moves up vertically and stops, is this kinetic or potential energy?

Potential Energy