Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics > Gravitational Fields > Flashcards

Gravitational Fields Flashcards

1
Q

What is Newtons Universal Law of Gravitation?

A

The force of attraction between two point masses is proportional to the product of their masses and inversely proportional to the square of their distances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is meant by a point mass?

A

Assuming that a mass is infinitesimally small

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the equation for the force of a gravitational field?

A

F=GMm/r^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are gravitational fields?

A

A model to help explain/calculate the force in an area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is a gravitational force?

A

The force of attraction between 2 or more point masses. It’s a fundamental force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the equation for a gravitational field?

A

g= GM/r^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Is a field a vector or a scalar?

A

Vector

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What law does the magnitude of the force obey?

A

The inverse square law

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Where is the field strength the greatest on solid bodies?

A

On the surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Why do astronauts float in the space station?

A

Because they are in freefall

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is Keplers 3rd law of planetary motion?

A

The period of an orbit squared is proportional to the radius cubed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the equation for orbital velocity?

A

V^2=GM/r

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the equation for time period of an orbit?

A

T^2=4pi^2r^3/GM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What must a body in a geostationary orbit do?

A

Have a 24 hour period and lie on the earths equatorial plane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the equation for gravitational potential energy?

A

GPE=-GMm/r

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the definition of gravitational potential energy?

A

The work done in moving a mass from infinity to a distance r within the gravitational field

17
Q

What is the equation for change in gravitational potential energy?

A

GPE=-GMm((1/r2)-(1/r1))

18
Q

What is the equation for escape velocity?

A

v=sqrt(2GM/r)

19
Q

What is the definition of a gravitational potential?

A

The work done in moving a unit mass from infinity to a distance r with in the gravitational field

20
Q

What are the units of then gravitational constant?

A

Nm^2kg^-2

21
Q

What units are gravitational fields?

A

NKg^-1

22
Q

Why are gravitational potentials negative?

A

The maximum GPE of a body is located at infinity. But at infinity, the field is zero so GPE is zero. So at distances less then infinity, there is a loss of GPE is it’s negative.

Physics (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions