Podcast
Questions and Answers
What is the SI unit of force?
What is the SI unit of force?
- Kilogram
- Newton (correct)
- Pound
- Joule
What distinguishes displacement from distance?
What distinguishes displacement from distance?
- Distance is a vector; displacement is a scalar.
- Distance only applies to motion along a straight line.
- Displacement includes direction; distance does not. (correct)
- Displacement measures the path taken; distance measures the shortest path.
Which type of force leads to an object being in equilibrium?
Which type of force leads to an object being in equilibrium?
- Net force greater than zero
- Frictional forces
- Unbalanced forces
- Balanced forces (correct)
Which of the following describes average speed?
Which of the following describes average speed?
What is represented on the y-axis of a Distance-Time graph?
What is represented on the y-axis of a Distance-Time graph?
What characterizes non-uniform motion?
What characterizes non-uniform motion?
What is the key difference between instantaneous speed and average speed?
What is the key difference between instantaneous speed and average speed?
In a velocity-time graph, what does the slope represent?
In a velocity-time graph, what does the slope represent?
Flashcards
Force
Force
A push or pull on an object that can cause changes in its motion, direction, shape, or size. It is a vector quantity, meaning it has both magnitude (strength) and direction.
Free-body diagram
Free-body diagram
A diagram that visually represents all the forces acting upon an object. It helps in understanding the net force acting on the object.
Net force
Net force
The sum of all forces acting on an object. If the net force is zero, the object is in equilibrium (at rest or moving with a constant velocity).
Distance
Distance
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Displacement
Displacement
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Speed
Speed
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Velocity
Velocity
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Motion graph
Motion graph
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Study Notes
7.2 The Concept of Force
- Force is a push or pull exerted on an object, potentially altering its motion, direction, shape, or size.
- Force is a vector quantity.
- The magnitude of force (strength) is measured in newtons (N).
- A spring scale is a common instrument for measuring force.
- A free-body diagram visually represents the forces acting on an object.
- Net force is the vector sum of all forces acting on an object.
- Balanced forces result in zero net force. An object experiencing balanced forces is at rest or moving at a constant velocity (equilibrium).
- Unbalanced forces create a net force not equal to zero, causing changes in an object's motion.
8.2 Descriptions of Motion
Distance vs. Displacement
- Distance is the total length of the path an object travels.
- Displacement is the straight-line distance from the starting point to the ending point, with a direction indicating the end point.
Speed
- Speed is the rate of motion (distance/time).
- Constant speed means equal distances are covered in equal time intervals.
- Instantaneous speed is the speed at a specific moment in time.
- A speedometer measures instantaneous speed.
- Average speed considers the total distance traveled divided by the total time.
Velocity
- Velocity combines speed and direction.
- Instantaneous velocity is the velocity at a specific moment in time.
- Average velocity considers the total displacement over total time.
8.3 Graphical Representation of Uniform and Non-uniform Motion
- Motion graphs visually depict how objects move.
Uniform Motion
- Objects in uniform motion travel at constant velocities.
Non-uniform Motion
- Non-uniform motion involves objects covering unequal distances in equal time intervals.
Distance-Time Graphs
- These graphs plot distance (y-axis) against time (x-axis).
Velocity-Time Graphs
- These graphs plot velocity (y-axis) against time (x-axis).
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