Physics Chapter on Speed and Velocity

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Questions and Answers

What is the average speed of a car that travels 96 km in 1.2 hours?

  • 90 km/h
  • 96 km/h
  • 72 km/h
  • 80 km/h (correct)

How do you convert an average speed of 80 km/h to m/s?

  • 28.8 m/s
  • 20 m/s
  • 22.2 m/s (correct)
  • 30 m/s

What is the average velocity of a person who rides 2 km east and then 2 km north in 2 hours?

  • 1.41 km/h North East (correct)
  • 2 km/h North
  • 2 km/h
  • 2.82 km/h North East

What happens to a car's velocity when it turns a corner while traveling at a constant speed?

<p>It changes due to direction alteration. (D)</p> Signup and view all the answers

What is the total distance covered by a person riding a bicycle 2 km east and then 2 km north?

<p>4 km (A)</p> Signup and view all the answers

What is the equivalent of 20 km/h in m/s?

<p>5.55 m/s (D)</p> Signup and view all the answers

If a person walks 4 m to the blackboard and then back 3 m, what is the total distance covered?

<p>7 m (D)</p> Signup and view all the answers

What is the displacement of James after walking 3 km north, 4 km east, and 3 km south?

<p>5 km (D)</p> Signup and view all the answers

How long does it take a train traveling at 8 m/s to cover a distance of 400 m?

<p>40 seconds (A)</p> Signup and view all the answers

What is the average speed of a person who travels 300 m north and then 400 m east in 2 minutes?

<p>6.25 m/s (A)</p> Signup and view all the answers

If a bicycle travels 300 m north and then 400 m east, what is the total displacement?

<p>500 m (C)</p> Signup and view all the answers

In which unit is speed commonly expressed in physics?

<p>m/s (C)</p> Signup and view all the answers

What is the correct conversion of 1 cm to meters?

<p>0.01 m (C)</p> Signup and view all the answers

What does the arrow in a vector represent?

<p>Both magnitude and direction (D)</p> Signup and view all the answers

Which step is NOT part of the vector addition process?

<p>Using only one arrow for multiple vectors (C)</p> Signup and view all the answers

What is the resultant velocity of the airplane flying East at 120 km/h with a wind blowing east at 20 km/h?

<p>140 km/h (B)</p> Signup and view all the answers

What is the purpose of setting up a direction reference in vector addition?

<p>To improve the accuracy of the vector diagram (C)</p> Signup and view all the answers

What does the term 'resultant' refer to in vector addition?

<p>The line joining the tail of the first vector to the head of the second (C)</p> Signup and view all the answers

Which statement is correct regarding the Pythagoras theorem in the context of vectors?

<p>It helps in determining the magnitude of the resultant of perpendicular vectors (D)</p> Signup and view all the answers

When drawing vector diagrams, why should vectors not be drawn too small?

<p>It reduces the accuracy of the vector representation (A)</p> Signup and view all the answers

What does a tangent (tan θ) value indicate in relation to a triangle?

<p>The ratio of the opposite side to the adjacent side (B)</p> Signup and view all the answers

What is the total distance traveled in the given scenario?

<p>16m (C)</p> Signup and view all the answers

How is displacement defined in the content?

<p>The straight line distance from starting to finishing point (C)</p> Signup and view all the answers

What is the displacement when the runner completes the race around the circular track?

<p>0m (D)</p> Signup and view all the answers

What is the value of the displacement from the starting position in the initial scenario?

<p>12m (C)</p> Signup and view all the answers

What mathematical theorem is used to calculate the displacement?

<p>Pythagorean theorem (A)</p> Signup and view all the answers

Which of the following statements about displacement is true?

<p>Displacement can be negative (A)</p> Signup and view all the answers

What represents the circumference of the circular track in the example?

<p>400m (A)</p> Signup and view all the answers

Which formula is used to find the radius of the circular track in the example?

<p>$C = 2 ext{Ï€}r$ (B)</p> Signup and view all the answers

What does the gradient of a velocity-time graph represent?

<p>Acceleration (C)</p> Signup and view all the answers

What is the primary advantage of using graphical analysis of motion?

<p>It provides a continuous picture of motion (D)</p> Signup and view all the answers

How can displacement be calculated from a velocity-time graph?

<p>By calculating the area under the graph (A)</p> Signup and view all the answers

What happens to the initial position when calculating final position using displacement?

<p>It is added to the displacement (B)</p> Signup and view all the answers

What do the units of the area under an acceleration-time graph represent?

<p>Velocity (A)</p> Signup and view all the answers

Which of the following statements is true about velocity and speed?

<p>Velocity is a vector quantity while speed is a scalar quantity (B)</p> Signup and view all the answers

What is required to calculate an object's final velocity from an acceleration-time graph?

<p>The initial velocity and the area under the graph (B)</p> Signup and view all the answers

What is the function of the area under a velocity-time graph?

<p>Calculate total distance covered (D)</p> Signup and view all the answers

What is the primary purpose of using physics in accident reconstruction?

<p>To determine the speed and direction of vehicles before the collision (D)</p> Signup and view all the answers

Which of the following accurately describes displacement?

<p>It requires a direction and is a vector quantity. (D)</p> Signup and view all the answers

How is velocity defined in terms of displacement and time?

<p>Velocity is displacement divided by time. (B)</p> Signup and view all the answers

What distinguishes a vector quantity from a scalar quantity?

<p>Vector quantities provide information about direction. (B)</p> Signup and view all the answers

In a one-dimensional motion, what do the positive and negative numbers represent?

<p>Direction along the number line (C)</p> Signup and view all the answers

What is true about both distance and displacement?

<p>They can both be described using the same symbol. (B)</p> Signup and view all the answers

Which statement correctly defines distance?

<p>It is the length of the actual path traveled without direction. (B)</p> Signup and view all the answers

Which of the following describes the average speed of a moving object?

<p>Distance traveled divided by the time taken. (B)</p> Signup and view all the answers

Flashcards

Displacement

A change in an object's position in a specific direction. It involves subtracting or adding vectors, resulting in another vector.

Distance

The length of the actual path travelled from the starting point to the finishing point. It only has a magnitude (size) and no direction.

Average Speed

The total distance travelled divided by the time taken. It is a scalar quantity representing the rate of change in distance, but not direction.

Velocity

The change in displacement over time. It's a vector quantity, considering both speed and the direction of motion.

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X-Axis

The line representing a direction, with positive and negative numbers indicating direction. It's used to specify the position of an object.

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Vector Quantity

A quantity that has both magnitude (size) and direction. Examples include displacement and velocity.

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Scalar Quantity

A quantity that has only magnitude (size) and no direction. Examples include distance, speed, and time.

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Total Distance

The total distance travelled by an object, including all its movements, regardless of direction.

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Displacement as a Vector

Displacement is a vector quantity, meaning it has both magnitude (size) and direction.

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Positive and Negative Displacement

Positive displacement indicates movement in a forward direction, while negative displacement indicates movement in a backward direction.

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Displacement and Compass Directions

Displacement can also be expressed using compass directions (e.g., 10m East).

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Distance and Circular Tracks

The circumference of a circular track is always the total distance travelled.

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Displacement and Full Circle Runs

The displacement of a runner completing a full lap on a circular track is zero, as they end up back at their starting point.

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Displacement and Half-Lap Runs

The displacement of a runner on a circular track after completing half a lap is equal to the diameter of the track.

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Speed

The rate at which an object changes its position over time.

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Average Velocity

The total displacement of an object divided by the total time taken.

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Instantaneous Velocity

The velocity of an object at a specific moment in time.

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Unit Conversion

The conversion of units from one system to another, e.g., from kilometers per hour (km/h) to meters per second (m/s).

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Acceleration

The change in velocity of an object over time. Formula: Acceleration = change in velocity / time.

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Pythagoras Theorem (for forces)

A mathematical method for finding the combined effect of forces. It uses the lengths and directions of force vectors to determine the resultant force.

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Vector (force)

A visual representation of a force, with its length representing the magnitude (strength) and its direction indicating the direction of the force.

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Adding Vectors

The process of combining two or more vectors to find a single resultant vector that represents the combined effect.

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Resultant Vector

The combined effect of multiple forces acting on an object.

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Direction Reference

A reference system used to describe direction, typically using cardinal directions (North, South, East, West) or compass points.

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Vector Diagram

Creating a vector diagram with the correct proportions and directions to accurately represent forces.

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Resultant Velocity

The combined effect of multiple velocities acting on an object, often used to describe the movement of objects in various conditions, such as airplanes flying with wind.

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Study Notes

Grade Levels and Subjects

  • Grade 7 and 8: Students are required to complete all six subjects.
  • Grade 9 and 10: Students must complete five subjects and one optional subject to be certified. Business Studies and Design and Technology-Computing are optional.
  • Grade 11 and 12: Students must complete seven out of thirteen subjects to be certified.

Grade 11 and 12 Course Programmes

  • Subjects: Applied English, Mathematics A/B, Personal Development, Biology, Chemistry/Physics, Geography/History/Economics, ICT, and Business Studies.
  • Language and Literature/Applied English
  • Mathematics A/B
  • Personal Development
  • Biology/Physics/Chemistry
  • Economics/Geography/History
  • Business Studies
  • ICT
  • Notes: Students should consult with their Provincial Coordinator or Supervisor for more information on subjects and courses.

Grade Level Requirements

  • Students need to seek advice from their Provincial Coordinator.
  • Grade 12 students must successfully complete seven subjects to be awarded a certificate in Matriculation Studies.
  • There are 5 compulsory and 3 optional courses for these grade levels.

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Related Documents

Grade 11 Physics Module 2: Motion (Kinematics) PDF

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