Friction And Gravity Flashcards
(19 cards)
True or False? The force that makes an apple fall to the ground is the same force that keeps earth orbiting the sun?
True
What does the universal law of gravitation state?
The force of gravity acts between all objects in the universe
The force of attraction between two objects varies with two factors
1)
2)
1) mass
2) distance
What is weight?
The force of gravity on an object
Weight is usually measured in _________.
Newtons
When is an object is free fall?
When gravity is the only force acting on an object
Near the surface of the earth, what is the acceleration of an object due to the force of gravity?
9.8 m/s/s
Objects falling through air experience a type of fluid friction called ____ __________.
Air resistance
A force that pulls objects towards each other is called =
Gravity
The greatest velocity a falling object reaches is called ___________ ____________.
Terminal velocity
An object thrown is called =
Projectile
A friction occurs when an object moves through liquid or gas:
Fluid friction
A friction that occurs when solid surfaces slide over each other:
Sliding friction
A friction that occurs when an objects rolls over a surface:
Rolling friction
A friction that occurs when objects aren’t moving:
Static friction
What are two factors that effect the friction force between two surfaces?
1) weight
2) surfaces
The strength of friction force depends on two factors what are they?
1) how hard the surfaces rub together
2) and the type of surface
What is mass?
Mass is a measure of the amount of matter in an object
What is weight?
The force of gravity on a person or object at the surface of a planet
