Forces Test 1
Gives energy to an object
Force
Never cause a change in motion (balanced or unbalanced force)
balanced
Mass times 9.8 gives you weight in ?
NEWTONS
The less distance apart the ______ the gravitational pull (greater of less )
greater
Changes energy onto heat energy
friction
Opposes motion
friction
What do Vectors represent ?(2 things)
Direction and Magnitude
when the forward inertia balances the downward pull of gravity
Orbital Motion
projectile motion is caused by what two things
forward inertia and gravity
What shape do all projectiles make
curve
name three types of friction
rolling sliding fluid
Newtons first law?
An object remains in it's motion unless acted on by an outside force
the resistance to a change in an objects motion
Inertia
a lubricant changes sliding friction into what type of friction?
fluid
what can start an object moving / stop an object from moving / changes the speed of an object / changes direction of an object
Force
what are two types of fluids
liquids and gases
Newtons Second Law
f=MA
when the downward pull of gravity is balanced by the upward push of wind resistance
terminal velocity
We wear seat belts to restrict what?
Inertia
If an object is in orbital motion what happens if it slows down?
Earth gravity will pull it down and out of orbital motion
Order the three types of friction from least to greatest
fluid, rolling sliding
Newtons 3rd Law
for every action there is an equal and opposite reaction
the more mass the ____ the gravitational pull (greater or less)
greater
These always cause a change in motion
unbalanced forces
Sliding friction depends on what two things?
surface type and weight