WFISD Junior High Science STAAR Review Remind the students that this exam will contain 54 total questions over the 4 reporting categories: matter & energy; force, motion & energy; earth & space; & organisms & environments. The test will also include 4 griddable items where they will be required to calculate an answer to a question & bubble in their answer on a response grid. Science process questions will make up at least 40% of the test.

Work the problem in your test, then transfer your answer to the grid! Griddable Reminder Work the problem in your test, then transfer your answer to the grid! 1 5 3 This is a sample griddable that will be used on 4 questions. Remind students that their answer should be written in the boxes at the top of the grid (with the decimal point in the correct place) with the number below each box darkened. The test question usually indicates which number place (i.e. tenths, hundredths) your should use for your answer.

Reporting category #2- Force, Motion, & Energy This reporting category will have 12 total questions over 2 readiness & 6 supporting standards.

6.8- force & motion are related to potential & kinetic energy… 6.8- Force, motion, & energy. The student knows force & motion are related to potential & kinetic energy.

Potential vs. Kinetic Energy Animation link SS 6.8A- compare & contrast potential & kinetic energy.

Sample Question for SS 6.8A: 1. The drawing above shows a diagram of the Steel Dragon 2000, a roller coaster in Japan. It is one of the longest roller coasters in the world. At which point on the roller coaster would a rider have the greatest gravitational potential energy? A. W C. Y B. X D. Z Sample questions for SS 6.8A

Calculating Average Speed SS 6.8C- calculate average speed using distance & time measurements. distance traveled time elapsed

Sample Question for SS 6.8C: Students in Mrs. Parker’s class placed a steel ball at the top of a long ramp. As the ball rolled down the ramp, the students measured the distance the ball had traveled at various times. The graph above is a record of their measurements. 2. What is the average speed of the steel ball between 3 seconds & 5 seconds of the investigation? A. 2.0 m/s C. 6.5 m/s B. 4.0 m/s D. 14.0 m/s Sample questions for SS 6.8C

Measuring Changes in Motion What is the reference point? change in position time Motion = SS 6.8D- measure & graph changes in motion. What is the reference point?

Graphing Changes in Motion Some general rules to remember: The steeper the graph, the faster the motion A horizontal line means the object is not changing its position- it is not moving, it is at rest A downward sloping line means the object is returning to the start SS 6.8D- measure & graph changes in motion.

Sample Question for SS 6.8D: 3. The graph shows the speed of a car traveling east over a 12-second period on a flat surface. In the first 6 seconds shown on the graph, the car is: A. increasing its speed. B. changing direction. C. heading northeast. D. gaining potential energy. Sample questions for SS 6.8D

6.9- the Law of conservation of energy states that energy can neither be created or destroyed, it just changes form 6.9- Force, motion, & energy. The student knows that the Law of Conservation of Energy states that energy can neither be created nor destroyed, it just changes form.

Energy Transformations SS 6.9C- demonstrate energy transformations such as energy in a flashlight battery changes from chemical energy to electrical energy to light energy. Animation link is energyeducationtx.gov Animation link

Sample Question for SS 6.9C: Sample questions for SS 6.9C 4. In the diagram above, a wind turbine is transforming energy from the wind. Between which two steps in the diagram is mechanical energy being converted into electrical energy? A. 1 & 2 C. 3 & 4 B. 2 & 3 D. 4 & 5

7.7 & 8.6- there is a relationship between force, motion & energy 7.7 & 8.6- Force, motion, & energy. The student knows that there is a relationship among force, motion, & energy.

Unbalanced Forces Change the Speed or Direction of an Object’s Motion RS 8.6A- demonstrate & calculate how unbalanced forces change the speed or direction of an object’s motion.

Unbalanced Forces… RS 8.6A- demonstrate & calculate how unbalanced forces change the speed or direction of an object’s motion.

Sample Question for RS 8.6A: 5. A toy train engine rests motionless on a track. One student begins pushing the engine to the right with a force of 2 Newtons. At the same time, another student begins pushing the engine to the left with a force of 5 Newtons. Which of the following best describes the resulting motion of the engine? A. The train will travel left at a constant speed. B. The train will travel left at an increasing speed. C. The train will travel right at a constant speed. D. The train will travel right at an increasing speed. Sample questions for RS 8.6A

Speed vs. Velocity vs. Acceleration Speed- how fast is the runner moving? Velocity- how fast is the car moving & in what direction? RS 8.6B- differentiate between speed, velocity, & acceleration. Acceleration- what is the rate at which the car’s speed or velocity is changing?

511 km/h 581 km/h 120 km/h How fast is it? speed 511 km/h 581 km/h RS 8.6B- differentiate between speed, velocity, & acceleration. 120 km/h How fast is it?

rate of motion in a specific direction velocity RS 8.6B- differentiate between speed, velocity, & acceleration. rate of motion in a specific direction

a measure of changing velocity acceleration positive vs. negative RS 8.6B- differentiate between speed, velocity, & acceleration. a measure of changing velocity

Sample Question for RS 8.6B: 6. A student is walking home from school. After 5 minutes it starts to rain lightly, so the student walks a little faster. After another 2 minutes it starts to rain hard, & the student runs the rest of the way home. The total time the student takes to get home is 10 minutes. Which graph below best represents the student’s motion during the trip home? A. C. B. D. Sample question for RS 8.6B

Sample Question for RS 8.6B: 7. At which points is the velocity of the car the same? A. Points A & B C. Points B & C B. Points A & C D. The velocity is not the same at any of the points. Sample question for RS 8.6B

Newton's 1st law An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed & in the same direction unless acted upon by an unbalanced force RS 8.6C- investigate & describe applications of Newton’s law of inertia, law of force & acceleration, & law of action-reaction such as in vehicle restraints, sports activities, amusement park rides, Earth’s tectonic activities, & rocket launches.

Newton's 2nd law RS 8.6C- investigate & describe applications of Newton’s law of inertia, law of force & acceleration, & law of action-reaction such as in vehicle restraints, sports activities, amusement park rides, Earth’s tectonic activities, & rocket launches. Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object)

For every action there is an equal & opposite re-action Newton's 3rd law For every action there is an equal & opposite re-action RS 8.6C- investigate & describe applications of Newton’s law of inertia, law of force & acceleration, & law of action-reaction such as in vehicle restraints, sports activities, amusement park rides, Earth’s tectonic activities, & rocket launches.

Sample Questions for RS 8.6C: 8. In a series of controlled experiments, a student measures the force acting on a wheeled cart & the cart’s acceleration. The student’s data are shown here: Based on the recorded observations, what is the mass of the cart in kilograms. Record & bubble in your answer in the griddable on your answer document. F = ma 20 kg. 9. When pressure is released during an earthquake, the type of energy displayed would be: A. kinetic energy. B. potential energy. C. gravitational energy. D. inertial energy. Sample questions for RS 8.6C

Inclined planes & pulleys SS 7.7A- contrast situations where work is done with different amounts of force to situations where no work is done such as moving a box with a ramp & without a ramp, or standing still.

Sample Questions for SS 7.7A: 10. Miranda walks up to home plate with her bat, stands with her bat in the air, swings her bat, & makes contact with the ball. In which part of this situation is no work occurring? A. batter walks up to home plate with her bat B. batter stands with her bat in the air C. batter swings the bat D. batter makes contact with the ball 11. How much work is done if a 2 Newton box is moved 4 meters? A. 0.5 Nm C. 4.0 Nm B. 2.0 Nm D. 8.0 Nm Sample questions for SS 7.7A W = Fd