Podcast
Questions and Answers
What is the velocity of an airplane flying at 635 km per hour at an altitude of 35,000 m over Kansas?
What is the velocity of an airplane flying at 635 km per hour at an altitude of 35,000 m over Kansas?
- 635 km/h
- This cannot be determined without further information about its direction. (correct)
- 16 m/min
- 35,000 m/s
What is the SI unit for speed?
What is the SI unit for speed?
- change in v/t
- mph
- ft/s^2
- m/s (correct)
On a speed-time graph, what does a line with a negative slope indicate?
On a speed-time graph, what does a line with a negative slope indicate?
- not moving
- slowing down (correct)
- traveling at a constant speed
- speeding up
What is the combination of all of the forces acting on an object called?
What is the combination of all of the forces acting on an object called?
If the net force acting on a stationary object is zero, what will happen to the object?
If the net force acting on a stationary object is zero, what will happen to the object?
If the net force on an object is zero, then the object has?
If the net force on an object is zero, then the object has?
A tug-of-war that results in one team pulling the other across the line is an example of?
A tug-of-war that results in one team pulling the other across the line is an example of?
Which of the following best illustrates balanced forces?
Which of the following best illustrates balanced forces?
Which of the following statements is true?
Which of the following statements is true?
An object is in motion when?
An object is in motion when?
Which straight-line acceleration indicates an increase in speed?
Which straight-line acceleration indicates an increase in speed?
Which is an example of balanced forces acting on an object?
Which is an example of balanced forces acting on an object?
An object that changes position relative to a reference point is?
An object that changes position relative to a reference point is?
Average speed can be represented by the mathematical expression?
Average speed can be represented by the mathematical expression?
The _____ of an object consists of its speed and direction.
The _____ of an object consists of its speed and direction.
The average speed of a runner who runs 500 m in 1.6 min is?
The average speed of a runner who runs 500 m in 1.6 min is?
A car moving at an average speed of 55.0 mi/h for 4.25 h has traveled?
A car moving at an average speed of 55.0 mi/h for 4.25 h has traveled?
On a distance vs time graph of an object's motion, distance is usually?
On a distance vs time graph of an object's motion, distance is usually?
A pitcher throws a baseball to home plate, a distance of 60.5 ft. The ball reaches home plate in 0.63 s. What is the velocity of the ball?
A pitcher throws a baseball to home plate, a distance of 60.5 ft. The ball reaches home plate in 0.63 s. What is the velocity of the ball?
When the motion of an object is shown by a straight line on a distance vs time graph with distance on the y-axis, the slope of the line is the?
When the motion of an object is shown by a straight line on a distance vs time graph with distance on the y-axis, the slope of the line is the?
On a bus traveling north at 20.0 m/s, a child stands up and walks toward the back of the bus at 1.3 m/s. What is the child's resultant velocity?
On a bus traveling north at 20.0 m/s, a child stands up and walks toward the back of the bus at 1.3 m/s. What is the child's resultant velocity?
Speeding up, slowing down, and changing direction is best described as?
Speeding up, slowing down, and changing direction is best described as?
When centripetal acceleration occurs, an object?
When centripetal acceleration occurs, an object?
The equation for finding average acceleration for straight-line motion is?
The equation for finding average acceleration for straight-line motion is?
Moving from 0 m/s to 25 m/s in 8.0 s equals an average acceleration of?
Moving from 0 m/s to 25 m/s in 8.0 s equals an average acceleration of?
A cyclist is traveling at an initial speed of 10.0 m/s. She accelerates at a rate of 0.500 m/s^2. What is her final speed after 9.0 s?
A cyclist is traveling at an initial speed of 10.0 m/s. She accelerates at a rate of 0.500 m/s^2. What is her final speed after 9.0 s?
Peter runs in a constant direction on a straight road. The velocity vs time graph of Peter's motion shows a straight line with a negative slope. What does the line tell you about Peter's speed?
Peter runs in a constant direction on a straight road. The velocity vs time graph of Peter's motion shows a straight line with a negative slope. What does the line tell you about Peter's speed?
When velocity changes by the same amount over each time interval, acceleration is?
When velocity changes by the same amount over each time interval, acceleration is?
On a velocity vs time graph, what shows the value of the acceleration?
On a velocity vs time graph, what shows the value of the acceleration?
A cheetah can accelerate at up to 6.0 m/s^2. How long does it take for a cheetah to speed up from 10.5 m/s to 12.2 m/s?
A cheetah can accelerate at up to 6.0 m/s^2. How long does it take for a cheetah to speed up from 10.5 m/s to 12.2 m/s?
What happens when a car slows down and velocity changes?
What happens when a car slows down and velocity changes?
Net force is?
Net force is?
An object experiencing balanced forces?
An object experiencing balanced forces?
Which is an example of static friction?
Which is an example of static friction?
Which is not an example of sliding friction?
Which is not an example of sliding friction?
The friction between objects that are stationary is called?
The friction between objects that are stationary is called?
On a distance vs time graph, the line of an object at rest is a?
On a distance vs time graph, the line of an object at rest is a?
The difference between speed and velocity is that velocity includes?
The difference between speed and velocity is that velocity includes?
An example of helpful friction is?
An example of helpful friction is?
Friction is defined as the?
Friction is defined as the?
Which is an example of kinetic friction?
Which is an example of kinetic friction?
When an object slows down, its acceleration is?
When an object slows down, its acceleration is?
Displacement?
Displacement?
The force of gravity, the electromagnetic force, the strong nuclear force, and the weak nuclear force are considered?
The force of gravity, the electromagnetic force, the strong nuclear force, and the weak nuclear force are considered?
On a speed vs time graph, constant acceleration is represented by a?
On a speed vs time graph, constant acceleration is represented by a?
The friction between the bristles of your toothbrush and the surfaces of your teeth is an example of?
The friction between the bristles of your toothbrush and the surfaces of your teeth is an example of?
Flashcards
Acceleration
Acceleration
The rate at which an object changes its velocity. It can be positive (speeding up), negative (slowing down), or zero (constant velocity).
Net Force
Net Force
The total effect of all forces acting on an object. It determines the object's motion according to Newton's laws.
Meters per second (m/s)
Meters per second (m/s)
The SI unit of speed, which measures distance traveled per unit of time.
Displacement
Displacement
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Friction
Friction
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Gravity
Gravity
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Balanced Forces
Balanced Forces
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Unbalanced Forces
Unbalanced Forces
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Speed
Speed
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Velocity
Velocity
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Kinetic Friction
Kinetic Friction
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Static Friction
Static Friction
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Negative Acceleration
Negative Acceleration
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Constant Acceleration
Constant Acceleration
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Average Acceleration
Average Acceleration
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Motion Relative to a Reference Point
Motion Relative to a Reference Point
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Distance vs. Time Graph
Distance vs. Time Graph
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Velocity vs. Time Graph
Velocity vs. Time Graph
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Object at Rest on a Distance vs. Time Graph
Object at Rest on a Distance vs. Time Graph
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Average Speed
Average Speed
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Helpful Friction
Helpful Friction
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Undesirable Friction
Undesirable Friction
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Fundamental Forces
Fundamental Forces
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Gravity
Gravity
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Electromagnetic Force
Electromagnetic Force
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Strong Nuclear Force
Strong Nuclear Force
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Weak Nuclear Force
Weak Nuclear Force
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Cheetah Acceleration
Cheetah Acceleration
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Car Distance Calculation
Car Distance Calculation
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Cyclist Acceleration
Cyclist Acceleration
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Study Notes
Motion and Forces
- An airplane's velocity cannot be determined without its direction, even if its speed is given as 635 km/h.
- The SI unit of speed is meters per second (m/s).
- A negative slope on a speed-time graph indicates an object is slowing down.
- The net force acting on an object is the combination of all forces acting on it.
Types of Forces
- If the net force on a stationary object is zero, it will remain at rest.
- Balanced forces result in a net force of zero, while unbalanced forces cause an object to accelerate in the direction of the stronger force.
- An object in motion relative to a reference point is considered in motion.
Speed and Velocity
- Average speed is calculated as distance divided by time (distance/time).
- Velocity includes both speed and direction.
- An increase in speed is indicated by positive acceleration.
Acceleration
- Average acceleration is calculated with the formula: (final velocity - initial velocity) / time.
- Constant acceleration occurs when velocity changes by the same amount over equal time intervals.
- Negative acceleration occurs when an object slows down.
Graphs and Motion
- In distance vs. time graphs, distance is the dependent variable, typically plotted on the y-axis.
- The slope of a distance vs. time graph indicates speed, while the slope of a velocity vs. time graph indicates acceleration.
- An object at rest has a flat line with a slope of zero on a distance vs. time graph.
Friction
- Static friction occurs between stationary objects, while kinetic friction is when objects are in motion.
- Helpful friction allows us to write on paper, while undesirable friction can wear out car tires.
- Friction acts as a force opposing the motion between two surfaces in contact.
Displacement and Forces
- Displacement involves the change in position of an object and must be in a specific direction.
- Fundamental forces include gravity, electromagnetic, strong nuclear, and weak nuclear forces.
- Friction is defined as the force that opposes motion between two surfaces that are touching.
Important Calculations and Examples
- A cheetah accelerating at 6.0 m/s² can speed up from 10.5 m/s to 12.2 m/s in approximately 0.28 seconds.
- A car traveling at an average speed of 55.0 mi/h over 4.25 hours covers a distance of 234 miles.
- A cyclist accelerating from 10.0 m/s at 0.500 m/s² will achieve a final speed of 14.5 m/s after 9.0 seconds.
Summary of Key Concepts
- Acceleration is the rate of change of velocity, which includes speeding up, slowing down, and changing direction.
- On a speed vs. time graph, constant acceleration is represented by a straight line.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your understanding of motion concepts with these flashcards based on Chapter 11. Explore fundamental principles such as velocity, altitude, and SI units. Great for reviewing essential physics topics before an exam.
