P8 Forces Flashcards
What is the definition of force?
A force is a push or pull acting on an object.
What is the unit of force in the International System of Units (SI)?
The unit of force is the Newton (N).
True or False: Force can only act when objects are in contact.
False.
Fill in the blank: The formula for calculating force is ___ = mass × acceleration.
force
What is the relationship between mass and weight?
Weight is the force exerted by gravity on an object’s mass.
What is gravitational force?
Gravitational force is the attraction between two masses due to gravity.
Which law states that an object will remain at rest or in uniform motion unless acted upon by a net external force?
Newton’s First Law of Motion.
What does Newton’s Second Law of Motion state?
Acceleration is produced when a force acts on a mass; the greater the mass, the greater the amount of force needed.
What is the formula for calculating weight?
Weight = mass × gravitational acceleration.
True or False: An object in motion will eventually come to rest without any external force acting on it.
True.
What is friction?
Friction is the resistance that one surface or object encounters when moving over another.
What are the two main types of friction?
Static friction and kinetic (sliding) friction.
Fill in the blank: The force that opposes the motion of an object is called ___.
friction
What is the principle of conservation of momentum?
In a closed system, the total momentum before an event is equal to the total momentum after the event.
What is the difference between balanced and unbalanced forces?
Balanced forces do not change the motion of an object, while unbalanced forces cause a change in motion.
What is air resistance?
Air resistance is a type of friction that acts against the motion of an object moving through the air.
True or False: The greater the surface area of an object, the less air resistance it experiences.
False.
What is tension force?
Tension force is the force transmitted through a string, rope, or wire when it is pulled tight.
What is the net force acting on an object?
The net force is the vector sum of all the forces acting on an object.
Fill in the blank: The force that keeps an object moving in a circular path is called ___.
centripetal force
What is the effect of increasing mass on the gravitational force between two objects?
Increasing mass increases the gravitational force between the objects.
What is a free-body diagram?
A free-body diagram is a visual representation of the forces acting on an object.
What is the role of the normal force?
The normal force acts perpendicular to the surface and supports the weight of an object resting on it.
True or False: All forces are vector quantities.
True.
What is the formula for calculating acceleration?
Acceleration = change in velocity / time taken.
What is the effect of friction on motion?
Friction opposes motion and can slow down or stop moving objects.
