topic 3 lesson 1-2 Flashcards
how do you know if an object is in motion
it’s position changes compared to the reference point
what is a reference point
fixed point used to determined movement of another object
motion is ____________
relative
relative to the sun, you ____ moving
are
Relative to the Earth _____ ______ moving
are not
Not only do object moves relative to one another, they also __________ up, ______ down, and change _________-
speed, slow, direction
a change in motion of an object can only happen when one or more _______ acts on an object
force
define force
a push or pull
when one object pushes or pulls another object, the _____ object experts a force on the __________ object
first, second
what are two things that describe force
strength and direction
what symbol do physicists use to represent relative force
arrow
The longer the _______ the greater the force
arrow
what is the unit for force
N (newton)
What are the two types of forces and define them
contact: when objects touch another
noncontact: doesn’t need to touch
Friction is a ________
contact
what are some examples of surface with high friction
chalk and bowling alley
what are 3 examples of noncontact force
gravity, magnetism, electrical forces
define speed =
the distance between of an object moves per unit of time
what is the equation for finding speed
speed= distance/time
what is instantaneous speed:
speed at the particular instant in time
what is the average speed
the speed throughout a trip
what is the equation for average speed
avg speed= total distance/ total time
what does slope should you
how one graph can show you how one varible changes another relation
how do you calculate the slope
rise over run
