Forces and Motion
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Questions and Answers

What happens when an unbalanced force acts on a resting body?

  • It changes its direction
  • It stays still and changes its shape
  • It remains in its state of rest
  • It starts moving (correct)

    • What is the condition for the resultant of all forces acting on a body to be zero?

  • When all forces are equal and opposite (correct)
  • When all forces act in the same direction
  • When the body is in uniform motion
  • When there is no force acting on the body

    • What is the effect of an unbalanced force on a moving body?

  • It increases its speed
  • It remains in uniform motion
  • It changes its direction
  • It stops or changes its motion (correct)

    • What is the force of friction that acts on a rolling ball?

    <p>Unbalanced force</p> Signup and view all the answers

    What is the condition for a body to change its state of rest or uniform motion?

    <p>When an unbalanced force acts on the body</p> Signup and view all the answers

    What happens to the toy car in Fig. 1.2?

    <p>It moves from its rest position</p> Signup and view all the answers

    What happens to the team in a tug of war when the other team suddenly releases the rope?

    <p>The team falls backward</p> Signup and view all the answers

    What is the condition for the forces acting on a body to be unbalanced?

    <p>When the resultant of all forces is not zero</p> Signup and view all the answers

    What is the effect of balanced forces on the state of motion of a body?

    <p>They do not change the state of motion of a body</p> Signup and view all the answers

    What is the result of all the forces acting on a body when balanced forces are applied?

    <p>The resultant force is always zero</p> Signup and view all the answers

    What is velocity?

    <p>The distance travelled by a body per unit time in a specified direction</p> Signup and view all the answers

    What does the speed of a bus give us an idea of?

    <p>How fast the bus is moving</p> Signup and view all the answers

    What is the difference between speed and velocity?

    <p>Speed is a scalar quantity, while velocity is a vector quantity</p> Signup and view all the answers

    What is the effect of unbalanced forces on a body?

    <p>They change the state of motion of a body</p> Signup and view all the answers

    What is the result of all the forces acting on a body when unbalanced forces are applied?

    <p>The resultant force is always non-zero</p> Signup and view all the answers

    What is crucial to a car's performance and handling?

    <p>Its acceleration</p> Signup and view all the answers

    What is the characteristic of an object moving with a uniform acceleration?

    <p>Its velocity increases by equal amounts in equal intervals of time</p> Signup and view all the answers

    What is the term used to describe the decrease in velocity of a body?

    <p>Deceleration</p> Signup and view all the answers

    What are the two factors that acceleration depends upon?

    <p>Direction and velocity</p> Signup and view all the answers

    Which of the following is an example of uniformly accelerated motion?

    <p>A freely falling body</p> Signup and view all the answers

    What happens to the velocity of a body when it undergoes positive acceleration?

    <p>It increases</p> Signup and view all the answers

    What is the characteristic of an object moving with a non-uniform acceleration?

    <p>Its velocity changes at a non-uniform rate</p> Signup and view all the answers

    Which of the following is NOT a type of acceleration?

    <p>Zero acceleration</p> Signup and view all the answers

    What happens to the acceleration of a car when it moves around a curve in the road?

    <p>It changes</p> Signup and view all the answers

    What is the result of unbalanced forces acting on a body?

    <p>A change in its state of rest or of uniform motion</p> Signup and view all the answers

    What is the formula for velocity?

    <p>Distance / Time</p> Signup and view all the answers

    What is the definition of acceleration?

    <p>The rate of change of velocity with respect to time</p> Signup and view all the answers

    What is the characteristic of a body with non-uniform acceleration?

    <p>Velocity increases by unequal amounts in equal intervals of time</p> Signup and view all the answers

    What is the direction of momentum?

    <p>Same as the direction of velocity</p> Signup and view all the answers

    What is the SI unit of momentum?

    <p>Kg.m/s</p> Signup and view all the answers

    What determines the quantity of motion possessed by a body?

    <p>Both mass and velocity</p> Signup and view all the answers

    What is the time period of a simple pendulum dependent on?

    <p>Both the length of the pendulum and the acceleration due to gravity</p> Signup and view all the answers

    What is the formula for pressure at a point in a liquid?

    <p>P = h ρ g</p> Signup and view all the answers

    What is the direction of the force applied by the pressure at a point in a liquid?

    <p>90° to the surface</p> Signup and view all the answers

    What is the effect of density on the pressure at a point in a liquid?

    <p>Increase in density increases pressure</p> Signup and view all the answers

    What is the relationship between pressure and height of the liquid column?

    <p>Pressure is directly proportional to height</p> Signup and view all the answers

    What is the effect of acceleration due to gravity on the pressure at a point in a liquid?

    <p>Increase in gravity increases pressure</p> Signup and view all the answers

    Why do objects become lighter in water?

    <p>Due to the upthrust of the liquid</p> Signup and view all the answers

    What is the shape of the container that affects the pressure at a point in a liquid?

    <p>None of the above</p> Signup and view all the answers

    What is the unit of atmospheric pressure normally given in weather reports?

    <p>Not specified</p> Signup and view all the answers

    Study Notes

    Forces

    • When an unbalanced force acts on a resting body, it produces motion.
    • Unbalanced forces are forces in which the resultant of all the forces acting on a body is not zero.
    • Unbalanced forces can change the state of rest or uniform motion in a straight line.

    Balanced and Unbalanced Forces

    • Balanced forces do not change the state of rest or motion of a body.
    • Balanced forces do not produce acceleration or deceleration.
    • Balanced forces can change the shape of the body but not the direction of motion.
    • The resultant of all the forces acting on a body is zero in balanced forces.

    Velocity

    • Velocity is the distance travelled by a body per unit time in a specified direction.
    • Velocity tells us how fast a body is moving along a particular direction.
    • Speed gives us an idea of how fast a body is moving, but it does not tell us the direction.

    Acceleration

    • If the change in velocity of a moving object is equal in equal intervals of time, the object is said to be moving with a uniform acceleration.
    • Uniform acceleration is when a body travels in a straight line and its velocity increases by equal amounts in equal intervals of time.
    • Non-uniform acceleration is when the change in velocity of a moving object is not equal in equal intervals of time.

    Retardation

    • Retardation is also known as deceleration or negative acceleration.
    • If the velocity of a body decreases, the acceleration is negative.

    Momentum

    • Momentum of a body at rest is zero.
    • Momentum is a vector quantity, possessing both magnitude and direction.
    • The direction of momentum is the same as the direction of velocity.
    • The SI unit of momentum is kilogram meter per second (kgm/s).
    • Momentum depends on both mass and velocity.

    Pressure

    • Pressure at a point vertically beneath the surface of a liquid is given by P = h ρ g.
    • Factors affecting the pressure at a point in a liquid are:
      • Depth of the point below the free surface (height of the liquid column)
      • Density of the liquid
      • Acceleration due to gravity
    • Pressure at a point at a certain depth in a liquid:
      • Is same in all directions
      • Applies force at 90° to any contact surface
      • Does not depend on the shape of the container

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    Description

    Quiz on forces acting on a toy car, including gravity, reaction, push, and frictional force. Understanding the balance of forces and their effects on motion.

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