You need to be certain that you can interpret graphs that show the motion of an object.
There are 2 kinds of graphs on the test:
Speed Graphs: This is where DISTANCE is plotted against TIME
Acceleration Graphs: This is where SPEED is plotted against TIME
For some help remembering....click here. (You need to have PowerPoint to view this file)
Tuesday, January 29, 2008
Unit 4 Test Study Guide
You should know the following:
1. Speed = Distance ÷ Time and when we graph speed, distance is on the Y axis and time is on the X axis
Constant speed on a graph is a straight line.
2. Acceleration = Speed ÷ Time Constant acceleration is a straight line on a speed vs. time graph
3. Friction is when two surfaces rub against each other. Friction causes things to slow down. Friction is very important for brakes to work
4. Forces are pushes or pulls. They can add together (if they're going the same direction) or subtract from each other (if they are acting in opposite directions)
5. When there is no air resistance objects fall at the same speed and will hit the ground at the same time.
6. More mass, more inertia. Inertia is the tendency of an object to remain in motion or stay at rest.
7. What factors (kinds) of things affect the rate of an object accelerating:
mass: more mass = less acceleration less mass = more easily accelerated
force: more force = faster acceleration less force = slower acceleration
8. In order to test something you would:
A. Make a hypothesis: “IF I do _______________ , THEN I think _______________ will happen.”
B. Test the hypothesis: “I will change ____________ and record what happens. I will repeat it several times.
C. Analyze the data: “I wrote down my observations in this chart and then made a graph.”
D. Make conclusions based on facts: “When I did _______ the measurement changed to ________, this proves my hypothesis as correct.”
1. Speed = Distance ÷ Time and when we graph speed, distance is on the Y axis and time is on the X axis
Constant speed on a graph is a straight line.
2. Acceleration = Speed ÷ Time Constant acceleration is a straight line on a speed vs. time graph
3. Friction is when two surfaces rub against each other. Friction causes things to slow down. Friction is very important for brakes to work
4. Forces are pushes or pulls. They can add together (if they're going the same direction) or subtract from each other (if they are acting in opposite directions)
5. When there is no air resistance objects fall at the same speed and will hit the ground at the same time.
6. More mass, more inertia. Inertia is the tendency of an object to remain in motion or stay at rest.
7. What factors (kinds) of things affect the rate of an object accelerating:
mass: more mass = less acceleration less mass = more easily accelerated
force: more force = faster acceleration less force = slower acceleration
8. In order to test something you would:
A. Make a hypothesis: “IF I do _______________ , THEN I think _______________ will happen.”
B. Test the hypothesis: “I will change ____________ and record what happens. I will repeat it several times.
C. Analyze the data: “I wrote down my observations in this chart and then made a graph.”
D. Make conclusions based on facts: “When I did _______ the measurement changed to ________, this proves my hypothesis as correct.”
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