Forces In Action Flashcards
(26 cards)
What is the definition of a force?
A force is a push or pull acting upon an object.
True or False: Forces can only be contact forces.
False
What unit is used to measure force in the International System of Units (SI)?
Newton (N)
Fill in the blank: The force of gravity acting on an object is known as its ______.
weight
What is the formula for calculating weight?
Weight = mass × gravitational field strength (W = mg)
Which of the following is a non-contact force? A) Friction B) Tension C) Gravity D) Normal force
C) Gravity
What is the effect of balanced forces on an object?
Balanced forces do not change the object’s motion.
True or False: Unbalanced forces will result in a change in motion.
True
What is the term for the resistance that one surface or object encounters when moving over another?
Friction
What is the relationship between mass and inertia?
Inertia is directly proportional to mass.
Fill in the blank: The force required to accelerate a 1 kg mass by 1 m/s² is called ______.
one Newton
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.
Which law states that for every action, there is an equal and opposite reaction?
Newton’s Third Law of Motion
What does the term ‘net force’ refer to?
The vector sum of all forces acting on an object.
What is the gravitational field strength on Earth?
Approximately 9.81 N/kg
True or False: The greater the mass of an object, the greater its weight.
True
What is the formula for calculating acceleration?
Acceleration = net force / mass (a = F/m)
Fill in the blank: The frictional force that opposes the motion of an object sliding over a surface is called ______ friction.
sliding
What is the difference between static and kinetic friction?
Static friction prevents motion, while kinetic friction acts on moving objects.
What does the term ‘resultant force’ mean?
The single force that represents the combined effect of all individual forces acting on an object.
Which of the following is not a type of friction? A) Rolling B) Sliding C) Static D) Dynamic
D) Dynamic
What is the principle of conservation of momentum?
The total momentum of a closed system remains constant if no external forces act on it.
What happens to the acceleration of an object if the mass increases while the net force remains constant?
The acceleration decreases.
Fill in the blank: The force that acts to pull objects toward the center of the Earth is known as ______.
gravity
