forces Flashcards
(26 cards)
What is a force?
A force is a push or pull acting on an object.
What is the unit of force in the SI system?
The unit of force is the Newton (N).
True or False: Forces can only be contact forces.
False.
What is gravitational force?
Gravitational force is the attraction between two masses.
Fill in the blank: The formula for calculating weight is _____ = mass × gravitational field strength.
weight
What is the effect of balanced forces on an object?
Balanced forces do not change the object’s motion.
What happens when unbalanced forces act on an object?
The object will accelerate in the direction of the net force.
What is friction?
Friction is the force that opposes the motion of an object.
What type of friction occurs when an object is moving?
Kinetic friction.
What is the formula for calculating acceleration?
Acceleration = (final velocity - initial velocity) / time.
True or False: Mass and weight are the same thing.
False.
What is the relationship between mass and inertia?
Inertia is the resistance of an object to changes in its state of motion, and it is directly related to mass.
Fill in the blank: The force required to change an object’s motion is proportional to its _____ and the acceleration produced.
mass
What is Newton’s first law of motion?
An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.
What does Newton’s second law of motion state?
Force equals mass times acceleration (F = ma).
What is Newton’s third law of motion?
For every action, there is an equal and opposite reaction.
What is a contact force?
A force that requires physical contact between two objects.
Give an example of a non-contact force.
Gravity.
What is the normal force?
The support force exerted by a surface perpendicular to an object resting on it.
Fill in the blank: The force that pulls objects toward the center of the Earth is called _____ force.
gravitational
True or False: The net force can be zero.
True.
What is the formula for calculating the resultant force?
Resultant force = sum of all forces acting on an object.
What does it mean for an object to be in equilibrium?
The net force acting on the object is zero.
What is tension?
The pulling force transmitted along a string, rope, or cable.
