Motion Flashcards
An object in motion will stay in motion in a straight line, forever, unless acted upon by an unbalanced force.
Half of Newton’s First Law
An object at rest will remain at rest unless acted upon by an unbalanced force
The other half of Newton’s First Law
If an object is experiencing an unbalanced force, we know that the _________ _____________ is not zero.
Net Force
If objects in motion tend to stay in motion, forever, unless acted upon by a net force, why do we seem to always see objects slowing down on their own?
Friction
(This is the force usually slowing down objects, and it is hard to actually see where the friction is coming from)
Another name for Newton’s First Law
Law of Inertia
Inertia means almost the same thing as __________
Mass
Objects with bigger mass have more _________
Inertia
If all the forces on an object are balanced, then there is no net force. In this case, we say the object is in ____________
Equilibrium
(Note: An object in equilibrium will have no acceleration, this means it could be either standing still OR moving along at a constant velocity)
Gravity can apply a ___________
Force
Magnetism can apply a __________
Force
Electrical charges can apply a _________
Force
(Think of static electricity pulling a sock onto your shirt when you take them out of dryer.)
“m” is a unit of
distance
“in” is a unit of
distance
“cm” is a unit of
distance
“miles” is a unit of
distance
”s” is a unit of
time
”s” means “seconds”
“hr” is a unit of
time
“days” is a unit of
time
“m/s” is a unit of
speed
(Units of speed will always have a distance over a time)
“cm/day” is a unit of
speed
(Units of speed will always have a distance over a time)
“mm/yr” is a unit of
Speed
(Units of speed will always have a distance over a time)
“m/s North” is a unit of
Velocity
(notice that it has a direction included)
“mm/yr East” is a unit of
Velocity
(notice that it has a direction included)
“cm/hr West” is a unit of
Velocity
(notice that it has a direction included)
“miles North” is a unit of
Displacement
(Displacement is a vector, so it has both magintude and direction.)
“cm West” is a unit of
Displacement
(Displacement is a vector, so it has both magintude and direction.)
Displacement
Vector or Scaler?
Vector
Velocity
Vector or Scaler?
Vector
Speed
Vector or Scaler?
Scaler
(has only magnitude)
Distance
Vector or Scaler?
Scaler
(Distance has magnitude only)
m / s2 is a unit of
acceleration
(notice the the units on the bottom is seconds squared)
“inches / day2“ is a unit of
acceleration
(notice the the units on the bottom is days squared)
A displacement/time graph is very similar to a ..
Distance/time graph
Displacement
How far you are from where you started.
(Very similar to “distance”)
the “sum of forces” on an object means
the net force on the object
