Middle school science

Total Flash Cards » 53
 
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