/ Teachers / Blogs
Hi PArents and Students,
The past week has been great with presentations and part of this week. Test 2 which will cover chapters 2 and 4 will occcur on Thursday 10/30
Again be advised that review questions 1 & 2 in the study guide will help prepare you for the test and also serve as 10% extra credit to be submitted on thursday the day of the test.
Keep the hardwork
Chapter 2 & 4 Test Study Guide
Key Terms
Key Concepts
- Like velocity and acceleration, a force is described by its strength and by the direction in which it acts.
- Unbalanced forces acting on an object result in a net force and cause a change in the object’s motion.
- Balanced forces acting on an object do not change the object’s motion.
Key Terms
Friction and Gravity
Key Concepts
- The strength of the force of friction depends on two factors: how hard the surfaces push together and the types of surfaces involved.
- Two factors affect the gravitational attraction between objects: mass and distance.
- In free fall, the force of gravity is an unbalanced force, which causes an object to accelerate.
Key Terms
- friction, static friction, sliding friction ,rolling friction ,fluid friction
- gravity , mass ,weight ,free fall ,air resistance
Newton’s First and Second Laws
Key Concepts
- First Law: An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force.
- Second Law: Acceleration depends on the object’s mass and on the net force acting on the object.
Key Term
Newton’s Third Law
Key Concepts
- If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.
- The momentum of a moving object is equal to its mass times its velocity.
Key Terms
Rockets and Satellites
Key Concepts
- A rocket can rise into the air because the gases it expels with a downward action force exert an equal but opposite reaction force on the rocket.
- Satellites in orbit around Earth continuously fall toward Earth, but because Earth is curved they travel around it.
Key Terms
What Is Work?
Key Concepts
- Work is done on an object when the object moves in the same direction in which the force is exerted.
- The amount of work done on an object can be determined by multiplying force times distance.
Key Terms
Review Questions: 1
Pages 69- 70 : 1,2,3,4,5,6,7,8,11,12,13,14,15,
Page 71: 1, 2 , 3 , 4 ,5(standardized test prep)
How Machines Do Work
Key Concepts
- A machine makes work easier by changing at least one of three factors. A machine may change the amount of force you exert, the distance over which you exert your force, or the direction in which you exert your force.
- A machine’s mechanical advantage is the number of times a machine increases a force exerted on it.
Key Terms
Simple Machines
Key Concepts
- There are six basic kinds of simple machines: the inclined plane, the wedge, the screw, the lever, the wheel and axle, and the pulley.
- You can determine the ideal mechanical advantage of an inclined plane by dividing the length of the incline by its height.
- The ideal mechanical advantage of a wedge is determined by dividing the length of the wedge by its width.
- The ideal mechanical advantage of a screw is the length around the threads divided by the length of the screw.
- The ideal mechanical advantage of a lever is determined by dividing the distance from the fulcrum to the input force by the distance from the fulcrum to the output force.
- You can find the ideal mechanical advantage of a wheel and axle by dividing the radius of the wheel by the radius of the axle.
- The ideal mechanical advantage of a pulley is equal to the number of sections of rope that support the object.
- Most of the machines in your body are levers that consist of bones and muscles.
- The ideal mechanical advantage of a compound machine is the product of the individual ideal mechanical advantages of the simple machines that make it up.
Key Terms
- inclined plane , wedge , screw lever ,fulcrum ,wheel and axle ,pulley
- compound machine
- Review questions 2
Pages 141- 142 :1,2,3,4,5,6,7,8,9,10,16,18,19
Page 143: 1,2,3,4,5
To allow flexibility in SF presentations students may also do a back board!
Hi Parents and students,
The Science fair projects are due Monday 20th, a week from toady! Hope you are all working towards finishing that up.
VERY ImPORTANT!!!
I would like to bring it to your attention that GUM /CANDY /CHIPS/FOOD /water(except with permission from the nurse) are not allowed in the classroom. I spoke to students all last week and any student doing anything of this will have 8 :am and later put on 5 step plan.
The reasons for the strick enforcement are
1- A student sat on a chair with gum and it got stuck on the pant
2-Gum was found stuck undaer other tables, chairs and textbooks
3-CAndy wraps/empty chip bags were found stuffed inside the desk.
These are unacceptable.
Please talk to your kids.
Keep the great work!
Mr. Fuamenya
Hi All,
We 've got 3 days until how chapter 1 tests .Here is the study guide and review questions.
If students complete the questions they get 10% points extra credit. A hard copy will be given to students in class.
Chapter 1 Test Study guide
Key Concepts:
Key Concepts
- Scientific inquiry refers to the diverse ways in which scientists study the natural world and propose explanations based on the evidence they gather.
- In science, a hypothesis must be testable. This means that researchers must be able to carry out investigations and gather evidence that will either support or disprove the hypothesis.
- Unlike a theory, a scientific law describes an observed pattern in nature without attempting to explain it.
Key Terms
Know the following: That ..
- An object is in motion if it changes position relative to a reference point.
- If you know the distance an object travels in a certain amount of time, you can calculate the speed of the object.
- When you know both the speed and direction of an object’s motion, you know the velocity of the object.
- You can show the motion of an object on a line graph in which you plot distance versus time.
- motion , reference point ,International System of Units ,meter , speed
- average speed , instantaneous speed ,velocity ,slope
Acceleration
Key Concepts
- In science, acceleration refers to increasing speed, decreasing speed, or changing direction.
- To determine the acceleration of an object moving in a straight line, you must calculate the change in speed per unit of time.
- You can use both a speed-versus-time graph and a distance-versus-time graph to analyze the motion of an accelerating object.
- Know the difference between speed and velocity
- Know the difference between a velocity vs time graph and a distance vs time.
- Know the units for Speed, velocity, acceleration, and time
REVIEW QUESTIONS
Review and assessment page 31 Motion Force and Energy
#s 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,11,12, 13, 16,17
Also go to
Practice Review quiz
http://www.glencoe.com/qe/science.php?qi=364
Good luck
NF
Hi Parents and students , our firs major test is coming up on Friday 3rd. Study guide and review questions will be posted on Tuesday Sep 30th
Keep working hard!
Nelson Fuamenya
Quick and easy to set up
