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PHYSICS 11 TODAY: Speed and Velocity Review Problems/Worksheets

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The Study of Motion

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As an object moves from one position to another, the length of the straight line drawn from its initial to the final position is called:

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The shortest distance between the origin and where the person is located Vector quantity - has magnitude and direction

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As an object moves from one position to another, the length of the straight line drawn from its initial to the final position is called:

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Δ = a change in… = delta

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Δd = a change between final and initial position

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A person is 2.0 m to the left of a viewpoint sign enjoying the view. She moves 4.5 m to the right of the sign to get a better view. What is the person’s displacement?

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Practice Problems 2.1.1 Page: 39 – 40

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503 m a) What is the total distance the golf ball travelled while the golfer was playing the seventh hole?

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290 m, right b) What is the Resultant Displacement of the Ball?

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equals to the object’s distance travelled over the time interval DIRECTION MAGNITUDE It has NO DIRECTION, only MAGNITUDE

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equals to the object’s total distance travelled over the time interval DIRECTION MAGNITUDE It has NO DIRECTION, only MAGNITUDE total

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equals to the object’s total distance travelled over the time interval DIRECTION MAGNITUDE It has NO DIRECTION, only MAGNITUDE

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equals to the object’s speed at the moment you are measuring the speed Give me an example of when we are interested in measuring instantaneous speed

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equals to the object’s speed at the moment you are measuring the speed

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What is a car’s average speed if the car makes a 100 km long trip from city A to city B if the first half of the trip is driven at 50 km/h and the second half is driven at 100 km/h?

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The average speed would be 75 km/h if the car spent equal time at 50 km/h and 100 km/h.

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What is the difference between:

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Distance travelled over time TOTAL Distance travelled over time Speed of an object at a particular instant

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Constant speed If the speed is not changed over an extended period of time

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The total displacement of an object over the time interval during which this displacement occurred is called:

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SI Units: meters per second (m/s)

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DIRECTIONMAGNITUDE It has DIRECTION and MAGNITUDE

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A book is moved once around the edge of a tabletop with dimensions 1.75 m 2.25 m.

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0.5 m/s, right

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If you know the object’s position at specific times, you can determine its VELOCITY Position vs. Time Graph If the VELOCITY is constant, the graph of position vs. time is a straight line. The slope indicates the VELOCITY

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Doing this problem GRAPHICALLY

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0.5 m/s, right Slope = velocity

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The positions of three runners were recorded at specific times. Here are their results: Position vs. Time Graph RUNNER 1 POSITION (km)TIME (min) 00 510 21 1529 2040 RUNNER 2 POSITION (km)TIME (min) 00 -58 -1015 -1525 -2030 RUNNER 3 POSITION (km)TIME (min) 00 512 1024 1533 2047 Describe the motion represented by each graph

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Positions of runners over time Time (min) Position (km)

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The positions of three runners were recorded at specific times. Here are their results: Velocity = ? RUNNER 1 POSITION (km)TIME (min) 00 510 21 1529 2040

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Positions of runners over time Time (min) Position (km)

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The positions of three runners were recorded at specific times. Here are their results: Velocity = slope RUNNER 1 POSITION (km)TIME (min) 00 510 21 1529 2040

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The positions of three runners were recorded at specific times. Here are their results: RUNNER 2 POSITION (km)TIME (min) 00 -58 -1015 -1525 -2030 Velocity = ?

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Positions of runners over time Time (min) Position (km)

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The positions of three runners were recorded at specific times. Here are their results: RUNNER 2 POSITION (km)TIME (min) 00 -58 -1015 -1525 -2030 Velocity = ?

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The positions of three runners were recorded at specific times. Here are their results: RUNNER 3 POSITION (km)TIME (min) 00 512 1024 1533 2047 Velocity = ?

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Positions of runners over time Time (min) Position (km)

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The positions of three runners were recorded at specific times. Here are their results: RUNNER 3 POSITION (km)TIME (min) 00 512 1024 1533 2047 Velocity = ?

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HOMEWORK Textbook : pg. 44 – 47 #1, #3, #5, #7

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Is a velocity of an object at some instant (moment) at a specific point in the object’s path

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Each moment a subject moves through larger and larger displacements If the VELOCITY is NOT constant, the graph of position vs. time is a curve. How can we find out the VELOCITY at some exact time (3 sec)?

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Construct a STRAIGHT LINE which is TANGENT to the curve at that time

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The slope of that STRAIGHT LINE = INSTANTANEOUS VELOCITY

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