Podcast
Questions and Answers
Which of the following units is used to measure speed?
Which of the following units is used to measure speed?
- Meters per second (m/s)
- Newton (N)
- Kilometers per hour (km/h)
- Both A and B (correct)
The average speed of an object is calculated by multiplying the distance traveled by the time taken.
The average speed of an object is calculated by multiplying the distance traveled by the time taken.
False (B)
What does a horizontal line on a distance-time graph indicate?
What does a horizontal line on a distance-time graph indicate?
- The object is decelerating.
- The object is moving at a steady speed.
- The object is at rest. (correct)
- The object is accelerating.
What does the slope of a straight line on a distance-time graph represent?
What does the slope of a straight line on a distance-time graph represent?
An object in non-uniform motion always moves at a constant speed in a fixed direction.
An object in non-uniform motion always moves at a constant speed in a fixed direction.
Define what a force is.
Define what a force is.
What effects can forces have on an object's motion?
What effects can forces have on an object's motion?
Forces are measured using a spring balance or a force sensor connected to a ______.
Forces are measured using a spring balance or a force sensor connected to a ______.
What is the unit of force?
What is the unit of force?
Match the descriptions to the type of force:
Match the descriptions to the type of force:
Gravity is an example of a contact force.
Gravity is an example of a contact force.
What does a free-body diagram represent?
What does a free-body diagram represent?
What happens to an object if balanced forces act on it?
What happens to an object if balanced forces act on it?
Speed is the ______ traveled by an object per unit time.
Speed is the ______ traveled by an object per unit time.
A steeper slope on a distance-time graph indicates a lower speed.
A steeper slope on a distance-time graph indicates a lower speed.
Which of the following graphs indicates that an object is moving at a steady speed?
Which of the following graphs indicates that an object is moving at a steady speed?
Write the formula for calculating average speed.
Write the formula for calculating average speed.
Which type of force requires direct physical contact between objects?
Which type of force requires direct physical contact between objects?
If an object is accelerating, the forces acting upon it must be balanced.
If an object is accelerating, the forces acting upon it must be balanced.
Flashcards
What is speed?
What is speed?
Distance travelled per unit time, measured in m/s or km/h.
How to calculate average speed?
How to calculate average speed?
Calculated by distance travelled divided by time taken.
What is a distance-time graph?
What is a distance-time graph?
Shows the distance travelled by an object at different times.
What does a horizontal line on distance-time graph indicate?
What does a horizontal line on distance-time graph indicate?
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What does a straight line with a slope indicate on a distance-time graph?
What does a straight line with a slope indicate on a distance-time graph?
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What is uniform motion?
What is uniform motion?
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What is non-uniform motion?
What is non-uniform motion?
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What is a force?
What is a force?
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What can forces change?
What can forces change?
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How can forces be measured?
How can forces be measured?
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What is the unit of force?
What is the unit of force?
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What are contact forces?
What are contact forces?
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What are non-contact forces?
What are non-contact forces?
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What does a free-body diagram show?
What does a free-body diagram show?
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What happens if balanced forces act on an object?
What happens if balanced forces act on an object?
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What happens if unbalanced forces act on an object?
What happens if unbalanced forces act on an object?
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Study Notes
11.1 Motion
- Speed is the distance travelled per unit time.
- Speed can be measured in meters per second (m s⁻¹) or kilometers per hour (km h⁻¹).
- Average speed is calculated by dividing distance by time: average speed (m s⁻¹) = distance (m) / time (s)
- A distance-time graph illustrates the distance travelled by an object over time.
- The shape of the distance-time graph indicates different types of motion.
- A horizontal line indicates the object is at rest.
- A straight line with a slope indicates the object is moving at a steady speed.
- A steeper slope indicates a higher speed.
- An object in uniform motion maintains a constant speed in a fixed direction.
- An object in non-uniform motion has a changing speed or direction.
11.2 Force
- A force is a push or a pull on an object.
- Forces can alter an object's speed and/or direction.
- Forces are measured using a spring balance or a force sensor connected to a data-logger.
- The unit of force is the newton (N).
- Contact forces require objects to be touching.
- Non-contact forces can exist between objects that are not touching.
- A free-body diagram shows all forces acting on an object.
- If balanced forces act on an object, it remains at rest or in uniform motion.
- If unbalanced forces act on an object, its motion changes.
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