Ch. 4.4-4.5 Flashcards
What are gravitational field lines?
The direction of the gravitational force is the direction of the force on a mass
What is gravitational field?
He gravitational influence in the space around a massive object
What do all objects acc. towards along the field lines?
The center of earth
When is the g.f. stronger?
Where the lines are closer together
Where is the g.f. weaker?
Where the lines are further apart
Where is the acc. due to gravity the largest?
Near earth
Where is the acc. due to gravity weaker?
Further from earth
Where is the g.f. present?
Everywhere
What do the lines show?
Shows the field at some points
How far does the g.f. field extend?
To infinity
What is an inverse square relationship?
Relationship between the magnitude of the g.f. and the distance from the mass
What is newtons law of universal gravitation?
All bodies with mass attract all other bodies with mass
What is the force proportional to?
The force is proportional to the product of the two masses and gets stronger as either mass gets larger
When does the force decrease?
The force decreases as the square of the distance between the two bodies increase
Who is Henry Cavendish?
Confirmed Newton’s law of gravitation and measured the gravitational constant which puts the force of gravity in N.
What was Robert Hooke’s lifespan?
1635-1703
What did Robert Hooke discover?
Discovered the property of springs
What do many springs have?
Many springs have a direct proportional relationship to force
What is Hooke’s law?
The restoring force exerted by a spring is directly proportional to the distance of stretch or compression of the spring
How do you measure the weights of food, gold, etc?
By hanging objects from scale
What is k?
An indication of how easy or difficult it is to stretch or compress a spring.
What is the inverse square equation
3d=1/3^2F=1/9F
What is the equation for Hooke’s law?
Fs=(-)kx
What is the formula for Newton’s law of universal gravitation?
FG=Gm1m2/r^2
What is Fs?
Force exerted by spring in N
