Physics Final

Question 1

How do you work safely in a lab?

Answer 1

1. Wear the appropriate equipment (lab coat, goggles, aprons, gloves)
2. Know where safety equipment is (Fire Blanket, eye wash station, fire extinguisher, heat detector, emergency stop for electricity, fume hood)
3. Keep work station clean (don’t have unnecessary things on table, don’t spill chemicals, clean up after experiment)
4. no eating (food, the experiment, etc.)
5. wash your hands and don’t touch your face

Question 2

Steps of the Scientific Method…

Answer 2

1. Purpose
2. Research
3. Hypothesis
4. Experiment
5. Analysis
6. Conclusion

Question 3

What is an independent variable?

Answer 3

the variable that is being tested, it is changed on purpose

Question 4

What is a dependent variable?

Answer 4

the variable that is measured to see effect

Question 5

what is a controlled variable?

Answer 5

stays the same throughout the experiment

Question 6

What is a reference point?

Answer 6

a stationary point that allows observers to see motion because the distance between the object and the stationary reference point changes

Question 7

what is speed

Answer 7

the distance traveled in a certain amount of time

or

how fast something goes

Question 8

formula and unit for speed

Answer 8

formula: distance/time
unit: meters/seconds

Question 9

what is the formula for distance?

what is the formula for time?

Answer 9

d = speed • time

t = distance/speed

Question 10

what is instantaneous speed?

Answer 10

the speed at a certain instant of time (right now)

Question 11

what is constant speed?

Answer 11

traveling equal distances in equal amounts of time (speed doesn’t change)

Question 12

what is average speed?

Answer 12

the total distance traveled in a certain amount of time

Question 13

formula for average speed

Answer 13

total time

Question 14

what is velocity?

Answer 14

the speed in a certain direction (how fast, which way)

Question 15

what is constant velocity?

Answer 15

covering equal distances in equal amounts of time without changing direction (no change in velocity)

Question 16

what is acceleration?

Answer 16

any change in velocity

Question 17

what are the three ways to change your acceleration?

Answer 17

1. slow down
2. speed up
3. turn

Question 18

formula and unit for acceleration

Answer 18

formula:
Final Velocity (Vf) - Initial Velocity (Vi)
—————————————————–
time (t)

unit: m/sec/sec

Question 19

what is another formula for distance (with velocity)?

Answer 19

(initial velocity) (time) + 1/2 (acceleration) (time) ^2

Question 20

what is a force?

Answer 20

any push or pull on an object

force has strength and direction

Question 21

what tool do you use to measure force?

Answer 21

a spring scale

Question 22

what unit does force use?

Answer 22

Newtons (N)

Question 23

what are the 8 types of force?

Answer 23

1. gravity
2. air
3. magnetic
4. buoyant
5. pressure
6. friction
7. applied
8. normal

Question 24

what is a force diagram?

Answer 24

shows all forces acting on an object

Question 25

what is net force?

Answer 25

the overall (total) force on an object

Question 26

how do you find the net force?

Answer 26

if the forces are going in the same directions —> —> add them!
if the forces are going in opposite directions —>

Question 27

what is an unbalanced force?

Answer 27

a nonzero net force (Fnet ≠ 0) that causes an object to accelerate

if the object is not moving, then it starts moving
if the object is moving, then it moves FASTER, SLOWER, or CHANGES DIRECTION

Question 28

what is a balanced force?

Answer 28

a zero net force (Fnet = 0) that does not cause an object to accelerate

if the object is not moving then it will NOT MOVE
if the object is moving, then it will continue at a constant velocity