dynamics: force and newtons law of motion Flashcards
(25 cards)
What is the definition of force in physics?
Force is an interaction that causes an object to change its velocity, which includes starting, stopping, or changing direction.
What is Newton’s First Law of Motion?
An object at rest will remain at rest and an object in motion will remain in motion at a constant velocity unless acted upon by a net external force.
True or False: Force is a scalar quantity.
False. Force is a vector quantity.
What is the unit of force in the International System of Units (SI)?
The unit of force is the Newton (N).
Fill in the blank: According to Newton’s Second Law, force equals mass times _______.
acceleration
What does Newton’s Second Law of Motion state?
The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
What is the formula for calculating force?
Force (F) = mass (m) × acceleration (a)
True or False: An object can be in motion if no net force is acting on it.
True, if it is moving at a constant velocity.
What is the significance of Newton’s Third Law of Motion?
For every action, there is an equal and opposite reaction.
Multiple Choice: Which of the following is an example of Newton’s Third Law? A) A car accelerating B) A rocket launching C) A ball rolling down a hill
B) A rocket launching
What is inertia?
Inertia is the tendency of an object to resist changes in its state of motion.
Fill in the blank: The net force acting on an object is the _______ of all the individual forces acting on it.
vector sum
What is the relationship between mass and acceleration according to Newton’s Second Law?
As mass increases, acceleration decreases for a constant force.
True or False: Weight is a measure of force.
True. Weight is the force of gravity acting on an object’s mass.
What is the formula for calculating weight?
Weight (W) = mass (m) × gravitational acceleration (g)
Multiple Choice: Which of the following describes a balanced force? A) Forces acting in the same direction B) Forces that cancel each other out C) Forces that cause acceleration
B) Forces that cancel each other out
What happens to an object if the net force acting on it is zero?
The object will remain at rest or continue to move at a constant velocity.
True or False: Acceleration can occur even if the speed is constant.
True, if the direction of motion changes.
What does the term ‘friction’ refer to?
Friction is the force that opposes the relative motion of two surfaces in contact.
Fill in the blank: The force required to move an object at constant velocity is equal to the _______ acting on it.
frictional force
What are contact forces?
Forces that occur when two objects are in physical contact with each other.
Multiple Choice: Which of the following is NOT a type of friction? A) Static B) Kinetic C) Dynamic D) Rolling
C) Dynamic
What is the difference between static and kinetic friction?
Static friction acts on an object at rest, while kinetic friction acts on an object in motion.
True or False: The greater the mass of an object, the greater its inertia.
True.
