Unit C: Forces Flashcards
Define Force
interaction between two objects through direct contact or indirect, results in a push or pull on the object
Define Net Force
sum of all the forces
Define Applied Force
direct force of an object
Newton’s Law of Universal Gravitation
in a vacuum; from above; only with planets
two objects attracted to one another towards each other
Define weight
the gravitational force that exists between the objects on Earth and the Earth; towards the center of the Earth
What does it mean when the net force is equal to 0?
it means acceleration is 0 so the object is either stationary or moving with constant velocity
State Newton’s first law
law of inertia
object in motion will stay in motion w/ constant velocity unless another force acts upon it
State Newton’s second law
the acceleration is directly proportional to the net force and the mass is inversely proportional to the direction of the acceleration is the same as the direction of the net force
State Newton’s third law
for every action force there is an equal and opposite reaction force
Define inertia
the natural tendency of an object to stay at rest or in motion at a constant speed
Why is it difficult for inertia to exist?
There are always other forces acting on an object especially on Eart e.g. gravitational force
air resistance
Defne mass
quanititative measure of inerta (kg)
How does Newston’s 3rd law relate to Newton’s Law of Universal gravitation?
If I’m attracted to the cup the cup is attracted to me
On what factors will the force be more?
Heavier the mass and closer the object= stronger the force
Define Normal Force
the force that one object’s surface exerts on another object’s surface when pushed against each other
