Gr 11 Physical Sciences: Ch 2.2 Newton’s laws
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Questions and Answers

What is the definition of apparent weight?

  • The vector sum of all the forces acting on an object
  • The force exerted by a surface to support the weight of an object resting on it
  • The normal force experienced by an object in a non-inertial frame of reference (correct)
  • The normal force experienced by an object in an inertial frame of reference

    • What is the main characteristic of an action-reaction pair?

  • They involve forces of different types
  • They involve forces of the same type with equal magnitude but opposite direction (correct)
  • They have equal magnitude but same direction
  • They act on the same object

    • What is the condition for an object to be in equilibrium?

  • The forces acting on it are unbalanced
  • The resultant force is less than zero
  • The sum of the forces acting on it is greater than zero
  • The sum of the forces acting on it and the resultant force are equal to zero (correct)

    • What is the definition of frictional force?

    <p>The force that opposes the motion of an object in contact with a surface</p> Signup and view all the answers

    What is the formula for static frictional force?

    <p>f_s = μ_s N</p> Signup and view all the answers

    Why do we resolve forces into components when dealing with inclined planes?

    <p>To separate the force into parallel and perpendicular components to the slope</p> Signup and view all the answers

    What is the purpose of a free body diagram?

    <p>To represent the object of interest with all forces acting on it</p> Signup and view all the answers

    What is the coefficient of friction?

    <p>A constant for a given pair of surfaces that can be different for static and kinetic friction</p> Signup and view all the answers

    What is the property of an object to continue in its current state of motion unless acted upon by a net force?

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

    What is the mathematical representation of Newton's Second Law of Motion?

    <p>F = ma</p> Signup and view all the answers

    What is the direction of the acceleration caused by a resultant force?

    <p>In the direction of the resultant force</p> Signup and view all the answers

    What happens to the normal force when a lift accelerates upwards?

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

    What is the net force acting on an object on an inclined plane?

    <p>The component of the gravitational force parallel to the slope</p> Signup and view all the answers

    What happens to the apparent weight when a lift accelerates downwards?

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

    What is the force that acts upward in a scenario involving vertical motion?

    <p>Tension or thrust</p> Signup and view all the answers

    What is the effect of the steeper slope on the acceleration of an object on an inclined plane?

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

    What is the direction of the force that causes an object on an inclined plane to accelerate?

    <p>Parallel to the slope</p> Signup and view all the answers

    What happens to the acceleration of an object on an inclined plane as the slope becomes steeper?

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

    What is the relationship between the net force and acceleration according to Newton's Second Law of Motion?

    <p>Acceleration is directly proportional to the net force</p> Signup and view all the answers

    What is the effect on the normal force when a lift accelerates?

    <p>It increases when the lift accelerates upwards and decreases when it accelerates downwards</p> Signup and view all the answers

    What is the reason for an object to continue in its current state of motion?

    <p>Due to the absence of a net force</p> Signup and view all the answers

    What is the force that acts downward in a scenario involving vertical motion?

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

    What is the purpose of resolving forces into components when dealing with inclined planes?

    <p>To find the component of the force parallel to the slope</p> Signup and view all the answers

    What happens to the apparent weight when a lift is stationary?

    <p>It remains the same as the actual weight</p> Signup and view all the answers

    What is the result when the sum of the forces acting on an object is zero?

    <p>The object is in equilibrium</p> Signup and view all the answers

    Which of the following is an example of an action-reaction pair?

    <p>The force of friction acting on an object and the force exerted by the object on the surface</p> Signup and view all the answers

    What is the purpose of resolving forces into components when dealing with inclined planes?

    <p>To find the components of the force parallel and perpendicular to the slope</p> Signup and view all the answers

    What is the direction of the kinetic frictional force acting on an object?

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

    Which of the following is a characteristic of static friction?

    <p>It varies up to a maximum value</p> Signup and view all the answers

    What is the representation of an object in a free body diagram?

    <p>A dot with all forces acting on it drawn as arrows pointing away from the dot</p> Signup and view all the answers

    What is the resultant force acting on an object when it is in equilibrium?

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

    What is the relationship between the normal force and the weight of an object resting on a surface?

    <p>The normal force is equal to the weight of the object</p> Signup and view all the answers

    What is the primary reason for an object to accelerate down an inclined plane?

    <p>The component of the gravitational force parallel to the slope acts as the applied force.</p> Signup and view all the answers

    Which of the following scenarios would result in a net downward force?

    <p>A lift accelerating downwards with a tension less than the gravitational force.</p> Signup and view all the answers

    What is the effect of a steeper slope on the acceleration of an object on an inclined plane?

    <p>The acceleration increases due to the larger parallel component of the gravitational force.</p> Signup and view all the answers

    What happens to the apparent weight of an object when it is accelerating upwards in a lift?

    <p>It increases due to the increased normal force.</p> Signup and view all the answers

    Which of the following forces is responsible for the acceleration of an object on an inclined plane?

    <p>The component of the gravitational force parallel to the slope.</p> Signup and view all the answers

    What is the relationship between the acceleration of an object and the net force acting on it, according to Newton's Second Law of Motion?

    <p>The acceleration is directly proportional to the net force and inversely proportional to the mass.</p> Signup and view all the answers

    What happens to the normal force when an object is accelerating downwards in a lift?

    <p>It decreases due to the decreased weight of the object.</p> Signup and view all the answers

    What is the direction of the force that causes an object to accelerate on an inclined plane?

    <p>Down the slope.</p> Signup and view all the answers

    What is the reason for the difference in the magnitude of the normal force experienced by an object on an inclined plane and a horizontal surface?

    <p>The difference in the angle of the inclined plane and horizontal surface</p> Signup and view all the answers

    A car accelerates on a horizontal road. What is the direction of the net force acting on the car?

    <p>Forward only</p> Signup and view all the answers

    What is the relationship between the static frictional force and the normal force?

    <p>The static frictional force is directly proportional to the normal force</p> Signup and view all the answers

    A box is being pulled up an inclined plane. What is the direction of the kinetic frictional force acting on the box?

    <p>Down the inclined plane</p> Signup and view all the answers

    What is the effect of increasing the angle of an inclined plane on the acceleration of an object?

    <p>The acceleration of the object increases</p> Signup and view all the answers

    What is the condition for an object to experience a resultant force of zero?

    <p>The sum of the forces acting on the object must be zero</p> Signup and view all the answers

    What is the relationship between the coefficient of static friction and the coefficient of kinetic friction?

    <p>The coefficient of static friction is always greater than the coefficient of kinetic friction</p> Signup and view all the answers

    A person is standing in a lift that is accelerating downward. What is the apparent weight of the person?

    <p>Less than the true weight</p> Signup and view all the answers

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