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Review Force and Motion Lesson 7
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Congratulations! We have finished Unit 1 Force and Motion. Now it is time to review what we learned.
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Take out your K-W-L chart in your notebook and as we review write what you learned from this unit on force and motion. Write it in the What I Learned section.
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What is gravity and mass?
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Gravity pulls any object on or near the earth toward it without touching it.
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Friction is a force that is always created anytime 2 surfaces move or try to move across each other.
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What is matter?
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All matter has mass.
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By changing any or all of these factors (gravity, friction, force and mass) will affect the motion of an object.
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Let’s look at how force affects the functions of a plane.
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Thrust is provided by the propeller or jet engine of the plane. Thrust acts to move the plane forward into the air.
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As the plane moves forward the shape of the wing (airfoil) causes a pressure difference that exerts an upward force on the wing -- the LIFT force.
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Gravity is the force that pulls objects back to Earth. In order to have an object like a plane rise higher the lift force must be stronger than the pull of gravity.
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Drag is air moving over a surface which experiences friction as the air molecules rub against the surface.
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Forces which affect the function of a plane.
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It is possible to measure the motion of an object based on the distance it will travel in a certain amount of time.
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What is the difference between velocity and rate (or speed)?
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Velocity adds direction to the rate(or speed).
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Rate (or speed) equals distance divided by time.
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What is the relationship of position, motion, direction and speed?
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If position, rate of speed or direction change it will change the time you will reach your destination.
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What is an axis?
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Axis is a reference line drawn on a graph (you can measure from it to find values). Here is a graph with an X Axis and a Y Axis.
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A graph can be created using one axis to represent the distance that an object travels, and the other axis to represent the period of time the object is traveling.
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It is easy to create a graph to help you see the relationship between distance and time.
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Time is always plotted on the X-axis (bottom of the graph). x y
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Distance is plotted on the Y-axis (side of the graph). x y
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A distance-time graph tells us how far an object has moved with time.
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The steeper the graph, the faster the motion.
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A horizontal line means the object is not changing its position - it is not moving, it is at rest.
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A downward sloping line means the object is returning to the start.
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What is the relationship between force and motion?
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The greater a force, the greater the change (in motion) it produces.
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What is the relationship between mass, force and motion?
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The greater the mass of the object, the less motion will occur if you are using the(same) force.
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Force equals Mass times Acceleration.
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If one part of the formula changes it will affect the outcome.
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Take sometime to review the vocabulary for Unit 1.
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In our next lesson we will take a test on all the information we have learned in Unit 1.
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Good Job Today! And remember to….
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See you next time!
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