5.12 Out Into Space

Question 1

What is 360 degrees in radians?

Answer 1

2 pi

Question 2

Definition of angular velocity?

Answer 2

Angle an object rotates through per second

Question 3

What equation links linear and angular velocity?

Answer 3

Linear velocity =radius x angular velocity

Question 4

Equation to calculate angular velocity?

Answer 4

Angular velocity=angle in radians/times in seconds

Question 5

What does the symbol for angular velocity look like?

Answer 5

Omega (curly w)

Question 6

What is frequency in circular motion?

Answer 6

Number of revolutions per second

Question 7

What is the unit of frequency?

Answer 7

Hertz

Question 8

What is the time period in circular motion?

Answer 8

Time taken for a revolution

Question 9

What equation links period and frequnecy

Answer 9

f=1/T

Question 10

Why is an object travelling in a circle accelerating even at constant speed?

Answer 10

Its velocity is changing as its direction is changing

Question 11

What is the name for acceleration in a circle?

Answer 11

Centripetal acceleration

Question 12

Where is centripetal acceleration directed?

Answer 12

Towards the centre of circle

Question 13

What is centripetal acceleration produced by?

Answer 13

A centripetal force acting towards the centre of the circle

Question 14

What is a gravitational field?

Answer 14

Region where an object will experience a non contact force

Question 15

What force will an object experience if you put it in the gravitational force of another object?

Answer 15

Attractive

Question 16

What is a uniform field? How are the field linescshown?

Answer 16

Field is the same every where

Lines are parralel and equally spaced

Question 17

What type of field do spjerical objects have?

Answer 17

Radial

Question 18

What can we assume about earths gravitational field close to the surface?

Answer 18

Uniform

Question 19

What type of law is the law of gravitation?

Answer 19

Inverse square law

Question 20

Whats the gravitational field strength definition?

Answer 20

Force per unit mass

Question 21

Why can we assume g is constant on earth?

Answer 21

Uniform field if you dont go to high

Question 22

What can be said about the force a mass experiences in a uniform field?

Answer 22

Constant

Question 23

What equation can we use to model force experienced in a uniform field?

Answer 23

F=mg

Question 24

What is potential energy proportional to in a uniform gravitational field?

Answer 24

Height

Question 25

Whats the equation for gravitational potnetial energy?

Answer 25

Change in e grav=mgh

Question 26

If an object is thrown up in a gravitational field how does the energy transfer?

Answer 26

Initial is all kinetic, transfers to potential as it gains height,stops gaining height when all kinetic transferred to potential and then reverse happens.

Question 27

How are g and r related in an inverse square law?

Answer 27

Gravitational field is inversely proportional to radius

Question 28

What can we define gravitational potnetional energy as at a given point?

Answer 28

Work needed to be done to move it from infinity to that point

Question 29

What is gravitational potmetial?

Answer 29

GPE per unit mass

Question 30

What are equipotentials?

Answer 30

Point in a field with the same gravitational potential

Question 31

What can be said about the transfer of energy when travelling along an equipotential?

Answer 31

Energy is constant, no work is done

Question 32

What are equipotenials perpendicular to ?

Answer 32

Field lines

Question 33

What is a satellite

Answer 33

A smaller mass that orbits a much larger mass

Question 34

Whats a geostationary sattelite?

Answer 34

A satellite that orbits earth once a day so appears stationary in the sky

Question 35

What does the area of a g against r graph show?

Answer 35

Gravitational potential

Question 36

What does the gradient of a GPE against r show?

Answer 36

Force

Question 37

What is the shape of all gravitation against radius graph?

Answer 37

Inverse curve under the bottom right quadrant as g is negative

Question 38

Why is no work done when moving along equipotentials?

Answer 38

Force is perpendicular to displacement so no work done as: W=FS