Questions and Answers
What is Speed?
distance ÷ time
What is the shape of a distance-time graph when the object is at rest?
a horizontal line
What is the shape of a distance-time graph when the object is moving with constant speed?
a slanted line
What is the shape of a distance-time graph when the object is moving with changing speed?
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What is the distance traveled for motion with constant acceleration in a speed-time graph?
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If a body accelerates, what will its speed-time graph have?
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If a body decelerates, what will its speed-time graph have?
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What is the difference between speed and velocity?
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What does 'a' represent in physics?
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Speed (on a distance-time graph) =
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Acceleration (on a speed-time graph) =
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On a speed-time graph, a straight line with a positive gradient means...
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On a speed-time graph, a curved line with a positive gradient means...
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What is Deceleration?
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What is the mass of a body?
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Weight is a _____________ force
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What is the difference between mass and weight?
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W (Weight) =
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How do you compare weights using a balance?
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What is 'inertia'?
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Weight (definition) =
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What does ρ represent in physics?
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Describe an experiment to determine the density of a liquid and of a regularly shaped solid.
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Describe the determination of the density of an irregularly shaped solid by the method of displacement.
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How do you predict whether an object will float based on density data?
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A force may produce a change in ____ ___ _____ of a body.
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Describe the ways in which a force may change a body.
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If two or more forces are acting on the same line, then the resultant force is equal to...
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If there is no resultant force on a body, it...
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Friction =
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Air resistance =
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State Hooke's Law.
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F (Hooke's Law) =
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What is the significance of the 'limit of proportionality' for an extension-load graph?
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What is the 'limit of proportionality'?
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Study Notes
Speed and Motion
- Speed is calculated as distance divided by time.
- A distance-time graph displays a horizontal line when an object is at rest.
- A constant speed results in a slanted line on a distance-time graph.
- A curved line indicates changing speed in a distance-time graph.
- In speed-time graphs, the area under the graph represents the distance traveled during constant acceleration.
- A speed-time graph shows a positive gradient for accelerating bodies and a negative gradient for decelerating bodies.
- Speed is a scalar quantity, while velocity is a vector with both magnitude and direction.
Acceleration
- Acceleration (a) is defined as the change in velocity (∆v) divided by time (t).
- On a distance-time graph, speed is represented by the gradient of the line.
- Acceleration on a speed-time graph is also indicated by the gradient.
- A straight line with a positive gradient on a speed-time graph indicates constant acceleration.
- A curved line with a positive gradient suggests changing acceleration.
- Deceleration is synonymous with negative acceleration.
Mass and Weight
- Mass refers to the number of particles in a body.
- Weight is a gravitational force acting on a mass.
- The difference between mass and weight lies in gravitational field strength affecting weight; mass remains constant.
- Weight (W) is calculated using the formula W = m × g, where g is the acceleration due to gravity.
- Comparison of weights using a balance scales involves placing weights on either side and determining which side is heavier.
Density
- Density (ρ) is calculated as mass (m) multiplied by volume (V).
- To find the density of a liquid or regular solid, weigh the object, measure the volume, and apply the density formula (ρ = m/V).
- The method of displacement is used for irregularly shaped solids: submerge the solid in water to measure the volume displaced and then find density.
- An object will float if its density is less than that of the liquid it's placed in.
Forces and Motion
- A force can alter the size and shape of a body.
- Forces can provoke changes in speed, direction, or shape of an object.
- When forces act along the same line, the resultant force is the sum of the individual forces.
- A body with no resultant force will either remain still or move at a constant speed in a straight line.
- Friction is the force between two surfaces that hinders motion and generates heat.
- Air resistance is a specific type of friction experienced by objects moving through the air.
Hooke's Law
- Hooke's Law states that the force (F) required to extend or compress a spring is proportional to the distance (e) it is stretched or compressed.
- The relationship in Hooke's Law is expressed as F = k × e, where k is the spring constant.
- The limit of proportionality refers to the point on an extension-load graph beyond which the relationship no longer remains linear and begins to curve.
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Description
Test your knowledge of key concepts in Physics with these flashcards tailored for the CIE IGCSE curriculum. This quiz covers topics such as speed, distance-time graphs, and varying motion, essential for mastering the subject. Perfect for revision or quick quizzes before exams.