48 Questions
What is the definition of apparent weight?
The normal force experienced by an object in a non-inertial frame of reference
What is the main characteristic of an action-reaction pair?
They involve forces of the same type with equal magnitude but opposite direction
What is the condition for an object to be in equilibrium?
The sum of the forces acting on it and the resultant force are equal to zero
What is the definition of frictional force?
The force that opposes the motion of an object in contact with a surface
What is the formula for static frictional force?
f_s = μ_s N
Why do we resolve forces into components when dealing with inclined planes?
To separate the force into parallel and perpendicular components to the slope
What is the purpose of a free body diagram?
To represent the object of interest with all forces acting on it
What is the coefficient of friction?
A constant for a given pair of surfaces that can be different for static and kinetic friction
What is the property of an object to continue in its current state of motion unless acted upon by a net force?
Inertia
What is the mathematical representation of Newton's Second Law of Motion?
F = ma
What is the direction of the acceleration caused by a resultant force?
In the direction of the resultant force
What happens to the normal force when a lift accelerates upwards?
It increases
What is the net force acting on an object on an inclined plane?
The component of the gravitational force parallel to the slope
What happens to the apparent weight when a lift accelerates downwards?
It decreases
What is the force that acts upward in a scenario involving vertical motion?
Tension or thrust
What is the effect of the steeper slope on the acceleration of an object on an inclined plane?
It increases the acceleration
What is the direction of the force that causes an object on an inclined plane to accelerate?
Parallel to the slope
What happens to the acceleration of an object on an inclined plane as the slope becomes steeper?
It increases
What is the relationship between the net force and acceleration according to Newton's Second Law of Motion?
Acceleration is directly proportional to the net force
What is the effect on the normal force when a lift accelerates?
It increases when the lift accelerates upwards and decreases when it accelerates downwards
What is the reason for an object to continue in its current state of motion?
Due to the absence of a net force
What is the force that acts downward in a scenario involving vertical motion?
Gravity
What is the purpose of resolving forces into components when dealing with inclined planes?
To find the component of the force parallel to the slope
What happens to the apparent weight when a lift is stationary?
It remains the same as the actual weight
What is the result when the sum of the forces acting on an object is zero?
The object is in equilibrium
Which of the following is an example of an action-reaction pair?
The force of friction acting on an object and the force exerted by the object on the surface
What is the purpose of resolving forces into components when dealing with inclined planes?
To find the components of the force parallel and perpendicular to the slope
What is the direction of the kinetic frictional force acting on an object?
Parallel to the surface
Which of the following is a characteristic of static friction?
It varies up to a maximum value
What is the representation of an object in a free body diagram?
A dot with all forces acting on it drawn as arrows pointing away from the dot
What is the resultant force acting on an object when it is in equilibrium?
Zero
What is the relationship between the normal force and the weight of an object resting on a surface?
The normal force is equal to the weight of the object
What is the primary reason for an object to accelerate down an inclined plane?
The component of the gravitational force parallel to the slope acts as the applied force.
Which of the following scenarios would result in a net downward force?
A lift accelerating downwards with a tension less than the gravitational force.
What is the effect of a steeper slope on the acceleration of an object on an inclined plane?
The acceleration increases due to the larger parallel component of the gravitational force.
What happens to the apparent weight of an object when it is accelerating upwards in a lift?
It increases due to the increased normal force.
Which of the following forces is responsible for the acceleration of an object on an inclined plane?
The component of the gravitational force parallel to the slope.
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?
The acceleration is directly proportional to the net force and inversely proportional to the mass.
What happens to the normal force when an object is accelerating downwards in a lift?
It decreases due to the decreased weight of the object.
What is the direction of the force that causes an object to accelerate on an inclined plane?
Down the slope.
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?
The difference in the angle of the inclined plane and horizontal surface
A car accelerates on a horizontal road. What is the direction of the net force acting on the car?
Forward only
What is the relationship between the static frictional force and the normal force?
The static frictional force is directly proportional to the normal force
A box is being pulled up an inclined plane. What is the direction of the kinetic frictional force acting on the box?
Down the inclined plane
What is the effect of increasing the angle of an inclined plane on the acceleration of an object?
The acceleration of the object increases
What is the condition for an object to experience a resultant force of zero?
The sum of the forces acting on the object must be zero
What is the relationship between the coefficient of static friction and the coefficient of kinetic friction?
The coefficient of static friction is always greater than the coefficient of kinetic friction
A person is standing in a lift that is accelerating downward. What is the apparent weight of the person?
Less than the true weight
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