Podcast
Questions and Answers
What is the velocity of the runner who runs 1600 meters west in 800 seconds?
What is the velocity of the runner who runs 1600 meters west in 800 seconds?
- 2.0 m/s west (correct)
- 1.5 m/s west
- 2.5 m/s west
- 3.0 m/s west
What is the displacement of the hiker who walked 2000 meters North and then 4000 meters South?
What is the displacement of the hiker who walked 2000 meters North and then 4000 meters South?
- 4000 m South
- 0 m
- 2000 m North
- 2000 m South (correct)
Which of the following describes how to find the resultant of two forces acting in opposite directions?
Which of the following describes how to find the resultant of two forces acting in opposite directions?
- The smaller force is subtracted from the larger force. (correct)
- The larger force is added to the smaller force.
- The forces are multiplied together.
- The forces are divided.
According to Newton's third law, what happens for every action?
According to Newton's third law, what happens for every action?
If a resultant vector has an angle of 30°, how can its components be determined?
If a resultant vector has an angle of 30°, how can its components be determined?
What is the primary difference between scalar and vector quantities?
What is the primary difference between scalar and vector quantities?
Which of the following is an example of a non-contact force?
Which of the following is an example of a non-contact force?
What formula would you use to calculate average speed?
What formula would you use to calculate average speed?
If a hiker walks 2000 meters north and then 4000 meters south, what is the total distance covered?
If a hiker walks 2000 meters north and then 4000 meters south, what is the total distance covered?
Which statement about balanced and unbalanced forces is true?
Which statement about balanced and unbalanced forces is true?
Flashcards
Scalar quantity
Scalar quantity
A quantity that has only magnitude (size), no direction.
Vector quantity
Vector quantity
A quantity that has both magnitude (size) and direction.
Speed
Speed
The rate at which an object covers distance.
Distance
Distance
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Displacement
Displacement
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Speed calculation
Speed calculation
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Velocity calculation
Velocity calculation
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Resultant vectors (same direction)
Resultant vectors (same direction)
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Resultant vectors (opposite direction)
Resultant vectors (opposite direction)
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Newton's Third Law of Motion
Newton's Third Law of Motion
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Study Notes
Force
- Force is a push, pull, or twist that can change an object's shape, speed, or direction. It's measured in Newtons (N).
- Contact forces require physical touch between objects.
- Non-contact forces act over a distance.
- Balanced forces are equal in size and opposite in direction, resulting in no change in motion.
- Unbalanced forces aren't equal and cause a change in motion.
- Speed is the distance covered per unit of time.
Speed
- Speed (s) = distance (d) / time (t)
- Speed is a scalar quantity, meaning it only has magnitude (size).
Types of Forces
- Contact forces include push, pull, lift, twist, upthrust, and friction.
- Non-contact forces include magnetism, gravity, and tension.
Acceleration
- Acceleration is the rate of change in velocity.
- Acceleration (a) = (change in velocity) / time.
- It's measured in m/s².
Scalars and Vectors
- Scalars have only magnitude (size). Examples: distance, speed, energy.
- Vectors have both magnitude and direction. Examples: displacement, velocity, acceleration, force.
- Distance is the length of the path traveled.
- Speed is the rate at which an object travels.
- Velocity is speed in a particular direction.
- Displacement is the change in position from a starting point.
Newton's Third Law
- Newton's third law states that for every action, there is an equal and opposite reaction.
Resultant Force
- Resultant force is the overall effect of all the forces acting on an object.
- Forces in the same direction are added.
- Forces in opposite directions are subtracted.
Accuracy and Precision
- Resultant vectors acting at an angle can be determined using a scale drawing.
- A suitable scale needs to be chosen, and a protractor will be required to measure the angle.
- Measure the components (horizontal & vertical) and their magnitudes.
- Vectors acting in the same direction are added.
- Vectors acting in opposite directions are subtracted.
- Vectors acting perpendicular to each other can be determined using a scale drawing.
Velocity-Time Graphs
- Velocity-time graphs are used to describe the motion of an object.
- Time is usually on the x-axis.
- Velocity is usually on the y-axis.
- The slope of a velocity-time graph represents acceleration.
- The area under a velocity-time graph represents the distance traveled.
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