Gravitational & Electric Fields:
Gravitational Fields:
2 objects:
Force of attraction (Fg) between them depends on:
• Fg directly prop. to m1
• Fg directly prop. to m2
• Fg directly prop. to m1.m2
Straight line through origin
(directly proportional)
• Big distance = small Fg
• Small distance = big Fg
1
• Fg directly proportional to
r2
• Fg inversely proportional to the square of the
distance between the masses
G:m1:m2
Fg =
r2
• m: Mass (kg)
• r: distance (metres)
• G: Universal Gravitational constant: 6; 7 £ 10¡11 N :m2 :kg ¡2
• F directly prop. to m1:m2
r2
Gravitational Fields:
2 objects:
Force of attraction (Fg) between them depends on:
• Fg directly prop. to m1
• Fg directly prop. to m2
• Fg directly prop. to m1.m2
Straight line through origin
(directly proportional)
• Big distance = small Fg
• Small distance = big Fg
1
• Fg directly proportional to
r2
• Fg inversely proportional to the square of the
distance between the masses
G:m1:m2
Fg =
r2
• m: Mass (kg)
• r: distance (metres)
• G: Universal Gravitational constant: 6; 7 £ 10¡11 N :m2 :kg ¡2
• F directly prop. to m1:m2
r2
