Newton's Laws Quiz
24 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What happens to a stationary object if the resultant force acting on it is zero?

  • It will remain stationary. (correct)
  • It will accelerate in a random direction.
  • It will begin to move at a constant speed.
  • It will spontaneously change speed.

    • Which of the following best describes the forces acting on a car traveling at a constant velocity?

  • The resistive forces are greater than the driving force.
  • The driving force balances the resistive forces. (correct)
  • The driving force is greater than the resistive forces.
  • There are no forces acting on the car.

    • If an object is accelerating downwards, what can be inferred about the forces acting on it?

  • The air resistance is equal to its weight.
  • The weight is greater than the air resistance. (correct)
  • The air resistance is greater than its weight.
  • The resultant force is zero.

    • In the context of Newton's first law, what is indicated by non-uniform motion?

    <p>The speed or direction of the object changes. (C)</p> Signup and view all the answers

    What is the role of resistive forces when a runner accelerates at the start of their run?

    <p>They are less than the thrust. (A)</p> Signup and view all the answers

    Which statement accurately describes an object falling at terminal velocity?

    <p>The air resistance is equal to its weight. (B)</p> Signup and view all the answers

    How do horizontal and vertical forces interact on a submarine?

    <p>They do not affect each other. (A)</p> Signup and view all the answers

    If a moving object continues to move at the same velocity, what can be inferred about the resultant forces acting on it?

    <p>The resultant force is zero. (D)</p> Signup and view all the answers

    What does it imply when the horizontal resultant force on an object is zero?

    <p>The object will remain stationary or move at a constant speed. (B)</p> Signup and view all the answers

    According to Newton's second law, how is acceleration affected by mass?

    <p>Acceleration decreases when mass increases. (C)</p> Signup and view all the answers

    If a submarine is moving at a constant speed, what can be concluded about the forces acting on it?

    <p>The horizontal and vertical forces are balanced. (D)</p> Signup and view all the answers

    What is the unit of force in Newton's second law equation?

    <p>Newtons (N) (D)</p> Signup and view all the answers

    What does the symbol ~ represent when estimating values?

    <p>Approximate value (A)</p> Signup and view all the answers

    How do you calculate the inertial mass of an object?

    <p>By dividing force by acceleration. (A)</p> Signup and view all the answers

    What would be the force needed to accelerate a 22 kg cheetah at 15 m/s²?

    <p>3300 N (B)</p> Signup and view all the answers

    What is the effect of an unbalanced vertical force on an object?

    <p>It accelerates in the direction of the resultant force. (C)</p> Signup and view all the answers

    What can be concluded about the forces exerted during the interaction between twoobjects according to Newton's third law?

    <p>They are equal in size and opposite in direction. (D)</p> Signup and view all the answers

    In the example of a cat on the ground, what are the forces involved?

    <p>The cat pulls the Earth up and the Earth pulls the cat down. (A)</p> Signup and view all the answers

    Which of the following scenarios illustrates Newton's third law of motion?

    <p>A pram being pushed forward while pushing the person back. (D)</p> Signup and view all the answers

    What is the relationship between weight and mass?

    <p>Weight increases with mass for a constant gravitational field strength. (B)</p> Signup and view all the answers

    How is weight calculated according to the information provided?

    <p>Weight = mass × gravitational field strength. (A)</p> Signup and view all the answers

    What is the weight of an object with a mass of 30 kg on Earth with a gravitational field strength of 10 N/kg?

    <p>300 N (C)</p> Signup and view all the answers

    In the scenario where an object is on the Moon, how does its weight compare to its weight on Earth?

    <p>It would be one-sixth of its weight on Earth. (C)</p> Signup and view all the answers

    Which of the following statements is true in the context of gravitational forces?

    <p>Gravitational forces are always non-contact forces. (C)</p> Signup and view all the answers

    Flashcards

    Newton's First Law

    An object stays in its state of motion unless acted upon by a net force.

    Resultant Force

    The overall force acting on an object after combining all forces.

    Balanced Forces

    Forces that cancel each other out, resulting in a zero resultant force.

    Unbalanced Forces

    Forces that do not cancel each other out, causing a non-zero resultant force.

    Signup and view all the flashcards

    Uniform Motion

    Motion at a constant speed and direction.

    Signup and view all the flashcards

    Non-uniform Motion

    Motion with changing speed or direction.

    Signup and view all the flashcards

    Acceleration

    The rate at which velocity changes.

    Signup and view all the flashcards

    Newton's Laws of Motion

    Three fundamental laws describing the relationship between forces and motion.

    Signup and view all the flashcards

    Newton's Third Law

    For every action, there is an equal and opposite reaction. When two objects interact, they exert forces on each other that are equal in magnitude and opposite in direction.

    Signup and view all the flashcards

    Force Pairs

    The two forces involved in Newton's Third Law always act on different objects and are of the same type (e.g., both contact forces).

    Signup and view all the flashcards

    Weight

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

    Signup and view all the flashcards

    Mass

    The amount of matter in an object.

    Signup and view all the flashcards

    Gravitational Field Strength

    The force of gravity acting on a unit mass at a specific location.

    Signup and view all the flashcards

    Weight Equation

    Weight = Mass × Gravitational Field Strength

    Signup and view all the flashcards

    Centre of Mass

    The point where an object's weight is considered to act.

    Signup and view all the flashcards

    Weight on Earth vs. Moon

    An object's weight is different on Earth and the Moon because the gravitational field strength is different.

    Signup and view all the flashcards

    Newton's Second Law

    The relationship between force, mass, and acceleration: Resultant force equals mass multiplied by acceleration (F = ma).

    Signup and view all the flashcards

    Inertial Mass

    A measure of how resistant an object is to changes in its velocity. It's the ratio of force to acceleration.

    Signup and view all the flashcards

    What's the force needed to accelerate a 22 kg cheetah at 15 m/s²?

    Calculate using F = ma. The force needed is 330 N (22 kg x 15 m/s²).

    Signup and view all the flashcards

    What's the force needed to accelerate a 15 kg gazelle at 10 m/s²?

    Apply the formula F = ma. The force required is 150 N (15 kg x 10 m/s²).

    Signup and view all the flashcards

    Estimate the force needed to accelerate a car

    Approximate values for a car: mass ~1600 kg, acceleration ~3 m/s². Using F = ma, the estimated force is ~4800 N (1600 kg x 3 m/s²).

    Signup and view all the flashcards

    Estimate the force to accelerate a lorry

    Use approximate values: Mass ~36,000 kg, acceleration ~0.4 m/s². The estimated force needed is ~14,400 N (36,000 kg x 0.4 m/s²).

    Signup and view all the flashcards

    What happens when forces are balanced?

    An object at rest stays at rest, and an object in motion continues moving at a constant speed and direction.

    Signup and view all the flashcards

    Study Notes

    Newton's Laws

    • Resultant forces cause acceleration, calculated using Newton's laws of motion. Weight is a gravitational effect.
    • Newton's first law states that an object's motion remains unchanged unless a resultant force acts upon it. If the resultant force is zero:
      • A stationary object stays stationary.
      • A moving object continues moving at the same velocity.
    • Examples of uniform motion (constant velocity):
      • A car traveling at a constant speed, where driving force equals resistive forces (air resistance and friction).
      • A runner at top speed with thrust equaling air resistance.
      • An object at terminal velocity with air resistance equaling weight.
    • Balanced forces result in zero resultant force and no acceleration. Objects remain at rest or move at constant velocity.

    Newton's Second Law

    • Newton's second law describes force, mass, and acceleration using the equation: Resultant force = mass × acceleration (F = ma).
    • Force is measured in newtons (N).
    • Mass is measured in kilograms (kg).
    • Acceleration is measured in meters per second squared (m/s²).
    • Acceleration is directly proportional to the resultant force and inversely proportional to the mass. An increase in force or a decrease in mass leads to an increase in acceleration.

    Examples of Non-Uniform Motion

    • Newton's first law explains non-uniform motion where speed changes or direction changes.
    • A car accelerating has driving force greater than resistive forces, resulting in non-zero resultant force.

    Forces on a Submarine

    • A submarine experiences both vertical and horizontal forces.
    • Balanced horizontal forces result in zero horizontal acceleration.
    • Balanced vertical forces result in zero resultant vertical acceleration.
    • The submarine continues in its current state (stationary or constant velocity) without any external direction change.

    Newton's Third Law

    • Newton's third law states that whenever two objects interact, they exert equal and opposite forces on each other.
    • Examples:
      • A person pushing a pram, where person's push on pram and pram push back on person.
      • Car tyre on a road, where tyre pushes road and road pushes tyre.
      • Satellite in Earth orbit, where Earth pulls satellite and satellite pulls Earth.

    Weight, Mass, and Gravitational Field Strength

    • Weight is the force of gravity acting on an object. It's calculated as weight (W) = mass (m) × gravitational field strength (g).

    • Mass is a measure of the amount of matter in an object (measured in kilograms, kg).

    • Gravitational field strength is measured in newtons per kilogram (N/kg).

    • Weight is directly proportional to mass, meaning more mass means more weight; the gravitational field strength is constant.

    • Measuring weight involves measuring the force needed to balance the object's weight. This is typically done using a spring balance which measures the force required to counter the weight.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Newton's Laws - Science Lesson Notes PDF

    Description

    Test your understanding of Newton's laws of motion with this quiz. Explore the concepts of resultant forces, acceleration, and balanced forces. Dive into real-world examples and the mathematical relationship described by Newton's second law.

    More Like This

    Force and Motion Principles Quiz
    6 questions

    Force and Motion Principles Quiz

    CooperativeVictory avatar
    CooperativeVictory
    Laws of Motion Overview
    8 questions

    Laws of Motion Overview

    EnticingBegonia avatar
    EnticingBegonia
    Physics: Newton's Laws of Motion
    40 questions

    Physics: Newton's Laws of Motion

    DeadOnAlpenhorn avatar
    DeadOnAlpenhorn
    Newton's Laws of Motion Quiz
    10 questions

    Newton's Laws of Motion Quiz

    SecureDerivative2551 avatar
    SecureDerivative2551
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser