Middle school science

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1. 
equal forces acting in opposite directions
 
balanced forces
 
2. 
occurs when an object's velocity decreases
 
negative acceleration
 
3. 
sum of all forces acting on an object
 
net force
 
4. 
total distance divided by total time
 
average speed
 
5. 
name for the slant of a line on a graph
 
slope
 
6. 
distance divided by time
 
speed
 
7. 
a push or pull exerted on a body or object
 
force
 
8. 
distance and direction of an object from its starting point
 
displacement
 
9. 
tendency to resist change in motion
 
Inertia
 
10. 
measure of how far and object has moved
 
distance
 
11. 
speed and direction of motion
 
velocity
 
12. 
rate of change of position at a specific point in time
 
Instantaneous speed
 
13. 
the rate of change in velocity
 
acceleration
 
14. 
compare and contrast: distance and displacement
 
both are links; displacement is direction and distance; distance is how far you have moved
 
15. 
compare and contrast: speed and velocity
 
both meters per second: speed is distance and velocity is speed and direction
 
16. 
explain the difference between positive and negative acceleration
 
positive is speeding up negative is slowing down
 
17. 
how are force and motion related?­-
 
both take unbalanced force to cause motion
 
18. 
what property of matter is inertia related to?
 
mass
 
19. 
a car travels west for 240 kilometers in 4 hours. What is the car's velocity?
 
60 kilometers per hour west
 
20. 
an object goes from a speed of 9 m/s to a total stop in 3 sec.what is the object's velocity?
 
-3
 
21. 
explain what causes an unrestrained passenger in a car to fly forward when the car stops suddenly
 
inertia
 
22. 
the amount of matter in an object
 
mass
 
23. 
the net force acting on an object is zero
 
blanced forces
 
24. 
the speed of an object and the direction of its motion
 
velocity
 
25. 
the sum of all the forces acting on an object
 
net force
 
26. 
rate of change of the velocity of an object
 
acceleration
 
27. 
a measure of how far an object has moved
 
distance
 
28. 
the rate of change in position at a given point in time
 
instantaneous speed
 
29. 
the distance and direction an object moves from its starting point
 
displacement
 
30. 
the total distance an object travels divided by the time of travel
 
average speed
 
31. 
the rate of change of an object's position
 
speed
 
32. 
unequal forces pushing in opposite direction
 
unbalanced forces
 
33. 
any change over time
 
rate
 
34. 
an object that is neither speeding up or slowing down travels at a________.
 
constant speed
 
35. 
a graph with distance on a vertical axis and time on a horizontal axis
 
distance-time graph
 
36. 
when an object is accelerating, its speed is_______.
 
changing
 
37. 
state newton's first law
 
an object at rest will remain at rest until an unbalanced force acts on it
 
38. 
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
 
39. 
will all forces cause an object to accelerate?
 
no only an unbalenced force
 
40. 
another name for newton's first law of motion
 
inertia
 
41. 
an object slowing down has a_______ acceleration
 
negative
 
42. 
the velocity of an object must have both a______ and a _________
 
speed; direction
 
43. 
the equation s=d/t is used to calculate the_____ of an object
 
speed
 
44. 
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
 
45. 
explain why the second hands of a clock cannot travels at constant velocities
 
they are changing direction
 
46. 
can the velocity of a car change when it's acceleration is constant? explain why or why not
 
yes the direction is always changing
 
47. 
a car approaching a red traffic light has a_________ acceleration; when the light turns green, the car's acceleration is ____
 
negative; positive
 
48. 
in the equation s=d/t, d stands for______
 
distance
 
49. 
in the equation used to calculate acceleration, Vi stands for _______ and Vf stands for______
 
initial;final
 
50. 
if the acceleration of a skateboarder is ___, the sakteboarder may be soon coming to a stop
 
negative
 
51. 
a net __ is necessary for an object to chanege its motion
 
unbalanced
 
52. 
a freight train has more__ than a care, so it has great inertia
 
mass
 
53. 
if two people push on an object beween them with equal force but in opposing directions, the net force is __?
 
zero