equal forces acting in opposite directions 

balanced forces 
 
occurs when an object's velocity decreases 

negative acceleration 
 
sum of all forces acting on an object 

net force 
 
total distance divided by total time 

average speed 
 
name for the slant of a line on a graph 

slope 
 
distance divided by time 

speed 
 
a push or pull exerted on a body or object 

force 
 
distance and direction of an object from its starting point 

displacement 
 
tendency to resist change in motion 

Inertia 
 
measure of how far and object has moved 

distance 
 
speed and direction of motion 

velocity 
 
rate of change of position at a specific point in time 

Instantaneous speed 
 
the rate of change in velocity 

acceleration 
 
compare and contrast: distance and displacement 

both are links; displacement is direction and distance; distance is how far you have moved 
 
compare and contrast: speed and velocity 

both meters per second: speed is distance and velocity is speed and direction 
 
explain the difference between positive and negative acceleration 

positive is speeding up
negative is slowing down 
 
how are force and motion related? 

both take unbalanced force to cause motion 
 
what property of matter is inertia related to? 

mass 
 
a car travels west for 240 kilometers in 4 hours. What is the car's velocity? 

60 kilometers per hour west 
 
an object goes from a speed of 9 m/s to a total stop in 3 sec.what is the object's velocity? 

3 
 
explain what causes an unrestrained passenger in a car to fly forward when the car stops suddenly 

inertia 
 
the amount of matter in an object 

mass 
 
the net force acting on an object is zero 

blanced forces 
 
the speed of an object and the direction of its motion 

velocity 
 
the sum of all the forces acting on an object 

net force 
 
rate of change of the velocity of an object 

acceleration 
 
a measure of how far an object has moved 

distance 
 
the rate of change in position at a given point in time 

instantaneous speed 
 
the distance and direction an object moves from its starting point 

displacement 
 
the total distance an object travels divided by the time of travel 

average speed 
 
the rate of change of an object's position 

speed 
 
unequal forces pushing in opposite direction 

unbalanced forces 
 
any change over time 

rate 
 
an object that is neither speeding up or slowing down travels at a________. 

constant speed 
 
a graph with distance on a vertical axis and time on a horizontal axis 

distancetime graph 
 
when an object is accelerating, its speed is_______. 

changing 
 
state newton's first law 

an object at rest will remain at rest until an unbalanced force acts on it 
 
if the net force acting on a body is zero, will the velocity be zero? 

no the velocity is constant, the object will not change its motion 
 
will all forces cause an object to accelerate? 

no only an unbalenced force 
 
another name for newton's first law of motion 

inertia 
 
an object slowing down has a_______ acceleration 

negative 
 
the velocity of an object must have both a______ and a _________ 

speed; direction 
 
the equation s=d/t is used to calculate the_____ of an object 

speed 
 
in terms of positive, negative, and zero exceleration, how would you describe the motion of a student moving in a cafeteria lunch line 

stand still zero
forward positive
backwards negative 
 
explain why the second hands of a clock cannot travels at constant velocities 

they are changing direction 
 
can the velocity of a car change when it's acceleration is constant? explain why or why not 

yes the direction is always changing 
 
a car approaching a red traffic light has a_________ acceleration; when the light turns green, the car's acceleration is ____ 

negative; positive 
 
in the equation s=d/t, d stands for______ 

distance 
 
in the equation used to calculate acceleration, Vi stands for _______ and Vf stands for______ 

initial;final 
 
if the acceleration of a skateboarder is ___, the sakteboarder may be soon coming to a stop 

negative 
 
a net __ is necessary for an object to chanege its motion 

unbalanced 
 
a freight train has more__ than a care, so it has great inertia 

mass 
 
if two people push on an object beween them with equal force but in opposing directions, the net force is __? 

zero 
 