2014 Fall Final 9th Grade Physics Review

The Basics KEY Connect the terms with the definitions by connecting them with a line.

Position The variable that is manipulated by the experimenter.

Distance A push or a pull Displacement mass per unit volume; measurement of how

tightly matter is packed together.

Velocity The location of an object with in a frame of reference.

Speed The variable that is manipulated by the experimenter. Amount of matter

Acceleration The variable that responds to the changes controlled by the experimenter.

Force How fast distance is covered

Mass The length of the straight line path from ending point to starting point; not path dependent.

Density The variable(s) that do not change during an experiment.

Independent Variable

The rate of change of velocity over time; getting faster, getting slower or changing directions.

Dependent Variable

The length of the path taken from ending point starting point; path dependent.

Constants The rate of change of position over time; speed in a particular direction.

! Connect the terms with the units by connecting them with a line.

Displacement Meter per second per second (m/s/s) Meter per second squared (m/s2)

Velocity Kilogram (kg)

Acceleration Meter (m)

Force Grams/cubic centimeter (g/cm3) Grams/millimeter (g/mL)

Mass Newtons (N)

Density Meter per second (m/s)

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2" !!Use the concepts from the previous page to help you answer the questions. Density

Material Density (g/cm3)

Which of the materials from the table will float in water? Air, wood, ice, ethanol & Methanol Which item from the table has the greatest mass per unit of volume? Gold’s density is 19.3 g/mL. Density is mass per unit volume. What is the volume of a 20 kg sample of lead? ! = !

! =!",!!!!!!!.!!!/!" = 1770!!"

What is the volume of a 10 kg sample of ethanol? ! = !

! = 10,000!!0.94!!/!" = 10,638!"

What is the mass of a 50 mL sample of ice? ! = !" = !.!"!

!" 50!!" = 46.5! What is the mass of a 50 mL sample of water? ! = !" = !.!!

!" 50!!" = 50! !Kinematics

Find the length from A to B to C. d = 4km + 3km = 7 km Find the length from A directly to C. Δx = 5 km Label the lengths above as the distance or displacement. Δx is displacement (straight line From end to start). ‘d’ is the distance covered. Sketch the x-t graph for an object Sketch the x-t graph for an object moving at constant velocity. moving at constant acceleration. X x t t

2014 Fall Final 9th Grade Physics Review

X (m) Position vs. time graph

t (s) 0 4 8 12 16 20 24

1. Add the title, scale and axis labels to the graph grid. 2. Plot the line from the table on the graph grid. Label it line A.

See graph. Line A is a blue, solid line.

3. How can you use this graph to find velocity? By finding the slope of line A, you can find the velocity.

4. Find the velocity of the object.

! = ∆!∆! =

!! − !!!! − !!

= 0− 4824 = 0 =

−48!24!! = −2!!!

5. Sketch in a line showing an object that is two times faster than A and

moving in the same direction. Show this new line starting in the same place as line A. Label this as line B. Line B is a blue, dashed line.

6. Sketch in a line showing an object that is two times faster than A and

moving in the opposite direction. Show this new line starting at x = 0 m. Label this as line C. Line C is a blue, dotted line.

7. Next, sketch a line showing an object at rest at a position of 6 meters.

Label this as line D. Line D is a green, solid line.

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36

24

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4" !!Use the graph on the previous page to answer these questions.

8. At what time do lines A and C reach the same position? t = 8 s

9. At what time do line A and D reach the same position? t = 22 s

10. At what time do lines C and D reach the same position? t = 1.5 s Acceleration Acceleration means: 1. getting faster 2. getting slower _ 3. changing directions What is the acceleration of an object moving at constant velocity? . a = 0 for an object at constant velocity What type of equilibrium is it in? Dynamic Equilibrium The forces on the object are balanced. What is the acceleration of an object at rest?a = 0 for an object at rest. What type of equilibrium is it in?_ Static Equilibrium The forces on the object are balanced. x

t The forces on an object that is accelerating are unbalanced. What type of equilibrium is this? disequilibrium !!!!

2014 Fall Final 9th Grade Physics Review

Forces Connect the terms with the definitions by connecting them with a line. Normal Force Support force from a liquid or gas.

Force due to gravity A deliberate force from a person or machine.

Friction Force Support force from a surface.

Applied Force Forces that resists motion or impending motion.

Buoyant Force Weight

Draw a force diagram for a Draw a force diagram for a box at rest on a table. box being pulled across a table at constant velocity. FN FN Fg Fg Newton’s Laws Find the acceleration of a 3 kg object when it is acted on by a 18 net force. ! = !!"#

! = !"!!!" = 6! !!!

Find the acceleration of the objects shown.

m = 5 kg m = 7 kg !! = !!"#

! = !!!!" = 0.4! !!! !!"#$ ! = !!"#

! = !!!!" = 0.8! !!! !!"#$

7 kg0.6

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6" !!Scientific Method Complete a concept map with the vocabulary shown. Experiments Valid Independent Variable Dependent Variable Testable question Control variables (constants) Data

NOT REQUIRED FOR 2018 FINAL