General Physics Revision Guide
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Questions and Answers

What is the acceleration of objects in freefall, assuming no air resistance?

  • 10 m/s² (correct)
  • 20 m/s²
  • 5 m/s²
  • 15 m/s²

Which statement is true about the fall of objects in the absence of air resistance?

  • Falling objects maintain a constant speed.
  • Falling objects all fall with the same acceleration. (correct)
  • Falling objects with greater mass fall faster.
  • Falling objects have increasing acceleration.

How does the speed of a falling object change over time in freefall?

  • It increases at a steady rate. (correct)
  • It fluctuates randomly.
  • It decreases steadily.
  • It remains constant.

What is the impact of air resistance on freefalling objects?

<p>It causes them to fall slower than in a vacuum. (A)</p> Signup and view all the answers

In freefall, at what point do objects experience maximum acceleration?

<p>As soon as they are released. (A)</p> Signup and view all the answers

What indicates a proportional relationship in a graph?

<p>A straight line going through the origin (A)</p> Signup and view all the answers

What occurs when the forces acting on a body are balanced?

<p>The body remains at rest or moves at constant speed (A)</p> Signup and view all the answers

Which of the following statements describes a linear relationship?

<p>The graph is a straight line that does not go through the origin (A)</p> Signup and view all the answers

How is the resultant force on a body determined when multiple forces act on it?

<p>Adding forces in the same direction and subtracting those in opposite directions (A)</p> Signup and view all the answers

In which scenario would a body not experience a change in its state of motion?

<p>When it is at rest without any forces acting on it (C)</p> Signup and view all the answers

What happens when a spring is stretched beyond its limit of proportionality?

<p>It becomes permanently deformed (B)</p> Signup and view all the answers

Which statement about resultant forces is correct?

<p>Balanced forces always equal zero (B)</p> Signup and view all the answers

When adding forces, what does a negative value represent?

<p>A force acting in the opposite direction (D)</p> Signup and view all the answers

What characterizes a renewable energy resource?

<p>It is replenished faster than it is used. (A)</p> Signup and view all the answers

Which of the following statements about reliable energy resources is true?

<p>They can generate energy at any time. (D)</p> Signup and view all the answers

Which of the following is NOT typically considered an advantage of renewable energy resources?

<p>They are always cheaper than fossil fuels. (D)</p> Signup and view all the answers

What distinguishes non-reliable energy resources from reliable ones?

<p>Non-reliable resources can only produce energy some of the time. (C)</p> Signup and view all the answers

What is a major disadvantage of using non-renewable energy resources?

<p>They can eventually be depleted over time. (B)</p> Signup and view all the answers

Which of the following best describes the term 'energy resources'?

<p>Energy resources include large stores of energy that can be transformed for use. (C)</p> Signup and view all the answers

Why are renewable energy resources considered sustainable?

<p>They can continuously replenish themselves without exhausting reserves. (A)</p> Signup and view all the answers

Which factor can impact the reliability of an energy resource?

<p>The geographical location of the resource. (D)</p> Signup and view all the answers

What is a significant factor that can affect the accuracy of very short time measurements?

<p>Human reaction time (A)</p> Signup and view all the answers

How can measuring a larger number of values improve accuracy when measuring small figures?

<p>It averages out random errors (B)</p> Signup and view all the answers

If you measure the combined thickness of 100 sheets of paper and find it to be 250 mm, what is the thickness of one sheet of paper?

<p>2.5 mm (C)</p> Signup and view all the answers

What is the primary reason for measuring the time taken for multiple swings of a pendulum before averaging?

<p>To reduce the impact of human error (C)</p> Signup and view all the answers

Why might measuring the thickness of a single sheet of paper be difficult?

<p>Thickness is relatively small (D)</p> Signup and view all the answers

What is a practical method to increase the reliability of time measurements taken with a stopwatch?

<p>Using automatic recordings (D)</p> Signup and view all the answers

Which of the following describes a potential drawback of using a stopwatch for time measurements?

<p>It is less accurate than digital timers (D)</p> Signup and view all the answers

When measuring small figures like the time period of a pendulum, how many swings should ideally be timed?

<p>10 swings (A)</p> Signup and view all the answers

What happens to the air resistance acting on a skydiver as they accelerate downwards?

<p>It increases as the skydiver speeds up. (C)</p> Signup and view all the answers

What is the condition for a skydiver to reach terminal velocity?

<p>The air resistance must balance the weight. (C)</p> Signup and view all the answers

When does a parachutist experience an upwards unbalanced force during their descent?

<p>When the parachute is opened. (A)</p> Signup and view all the answers

Why is it important to refer to the force of gravity as weight in physics?

<p>Gravity can mean different terms in different contexts. (D)</p> Signup and view all the answers

What force primarily acts against the downward motion of a parachutist?

<p>Air resistance. (A)</p> Signup and view all the answers

How does a skydiver accelerate when they first jump out of the aeroplane?

<p>There is a downwards unbalanced force. (A)</p> Signup and view all the answers

What change occurs in a skydiver’s speed when they reach terminal velocity?

<p>Their speed remains constant. (A)</p> Signup and view all the answers

What effect does the parachute have when it is deployed?

<p>It increases air resistance significantly. (D)</p> Signup and view all the answers

What does speed measure in physics?

<p>The distance moved by an object each second (A)</p> Signup and view all the answers

Which unit is commonly used to measure speed?

<p>Metres per second (B)</p> Signup and view all the answers

What does the formula for average speed involve?

<p>Distance divided by time (C)</p> Signup and view all the answers

How can you visualize the average speed equation?

<p>Using a formula triangle (B)</p> Signup and view all the answers

What do the units of speed help to remember?

<p>The relationship between distance and time (C)</p> Signup and view all the answers

What does average speed indicate?

<p>Overall speed during the entire journey (A)</p> Signup and view all the answers

Which statement is true regarding speed and acceleration?

<p>Acceleration measures change in speed over time (A)</p> Signup and view all the answers

Which of the following could represent an acceleration of an object?

<p>$5 m/s^2$ indicates the object's speed is increasing (C)</p> Signup and view all the answers

Flashcards

Time Intervals

The duration between two specific points in time.

Stop-clocks and Stopwatches

Devices used to measure short time intervals precisely.

Human Reaction Time

The time it takes for a person to respond to a stimulus.

Multiple Readings

Taking a series of measurements to improve accuracy.

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Measuring Small Quantities

Multiple readings are useful for measuring very small things.

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Accurate Measurement

Getting a measurement close to the true value.

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Time Period of a Pendulum

The time it takes for a pendulum to complete one full swing.

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Accuracy Improvement

Taking multiple measurements helps improve accuracy, especially for small quantities.

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Speed

A measurement of how fast an object is moving. It is calculated as the distance traveled divided by the time taken.

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Average Speed

The total distance traveled divided by the total time taken. It doesn't tell you the speed at any specific moment, but the overall speed over the entire journey.

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Speed Units

Speed is usually measured in meters per second (m/s). This means the object travels a certain number of meters in one second.

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Formula Triangle

A visual tool to help remember and rearrange formulas. It shows the relationship between speed, distance, and time.

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Rearranging Formula

Using the formula triangle, you can rearrange the formula to calculate distance or time if you know the other two variables.

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Specific Moment Speed

The speed of an object at a precise time, which may be different from the average speed.

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Freefall

The motion of an object falling solely under the influence of gravity, with no other forces acting on it.

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Acceleration due to Gravity

The constant rate at which an object accelerates while falling freely due to the Earth's gravitational pull.

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Air Resistance

A force that opposes the motion of an object through the air, slowing it down.

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In the absence of air resistance...

Objects of different masses will fall at the same rate, experiencing the same acceleration due to gravity.

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Speed of falling object

The speed of a falling object increases at a constant rate as it falls, getting larger the longer it falls.

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Terminal Velocity

The constant speed reached by a falling object when the force of air resistance equals the force of gravity.

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Weight

The force of gravity acting on an object's mass.

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Unbalanced Force

A force that causes an object to accelerate, either speeding up or slowing down.

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How does a parachute affect terminal velocity?

A parachute increases air resistance, significantly reducing terminal velocity, making the descent much slower.

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Why does terminal velocity occur?

Terminal velocity occurs when the force of air resistance becomes equal to the force of gravity, resulting in a constant speed.

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What happens to the air resistance as an object falls?

As an object falls and its speed increases, the air resistance also increases, opposing its motion.

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What happens to the skydiver's velocity before reaching terminal velocity?

The skydiver accelerates downwards because the force of gravity is greater than air resistance.

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Resultant Force

The overall force acting on an object when multiple forces are applied. It's found by adding forces in the same direction and subtracting forces in opposite directions.

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Proportional Relationship

A relationship between two quantities where the ratio between them remains constant. On a graph, this is represented by a straight line passing through the origin.

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Linear Relationship

A relationship between two quantities where the graph is a straight line, but doesn't necessarily pass through the origin. This means the change in one quantity is always proportional to the change in the other.

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Energy Resources

Large banks of energy that can be converted into usable forms for society, like electricity.

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Renewable Energy

Energy resources that replenish faster than they are used, ensuring they won't run out.

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Non-Renewable Energy

Energy resources that are consumed faster than they can be replenished, meaning they will eventually run out.

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Reliable Energy

Energy resources that can be used consistently and dependably to produce energy at any time.

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Non-reliable Energy

Energy resources that cannot produce energy consistently, and may only be available at certain times.

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Advantages of Energy Resources

Positive aspects of using a particular energy resource, such as low cost, sustainability, or efficiency.

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Disadvantages of Energy Resources

Negative aspects of using a particular energy resource, such as pollution, high cost, or limited availability.

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Energy Resource Evaluation

Analyzing the advantages and disadvantages of various energy resources to make informed decisions about their use.

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Study Notes

General Physics

  • This is a general physics revision guide.
  • Different topics are covered such as Length and Time, Motion, Mass and Weight, Density, Forces, Momentum, Energy, Work and Power, Energy Resources, Efficiency, Pressure and their measurements.
  • Additional topics are covered such as circular motion, moments, conditions for equilibrium, centre of mass, scalars and vectors.

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Description

This quiz serves as a comprehensive revision guide for general physics. Covering essential topics such as motion, forces, energy, and circular motion, it helps reinforce your understanding of the subject. Whether you're reviewing for exams or just want to solidify your knowledge, this quiz is an excellent resource.

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