Definitions Flashcards
Define Weight (Fg).
The gravitational force the Earth exerts on any object on or near its surface.
Define Normal Force (Fn).
The perpendicular exerted by surface on an object in contact with it.
Define Frictional Force (Ff).
The force that opposes the motion of an object and acts parallel to the surface with which the object is in contact.
State Newton’s first law.
An object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force.
Define inertia.
It is the property of an object that causes it to resist a change in its state of rest or uniform motion.
State Newton’s second law.
When a net force, Fnet , is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration, a, is directly proportional to the net force and inversely proportional to the mass.
State Newton’s third law.
When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A.
What is a force?
Push or pull.
Why is a force a vector quantity?
It has both magnitude and direction.
A force acts on an ____.
Object
Why does a force always require?
A force requires an agent and every force is caused by an agent. If you are throwing a ball, your hand is the agent and is causing a force to be exerted while it is in contact with the ball. A falling object experiences a force due to the non-contact force of gravity.
Define gravitational force.
It is defined as the force the Earth exerts on an object on or near its surface.
Define mass.
Is a property of the object and is a measure of the amount of matter in an object.
Define weight.
Is a measure of the force of attraction between the Earth and an object on or near the surface of the Earth.
What happens when an object moves through a liquid or a gas?
It experiences a resistive force. This resistive force is called drag. Drag is another force that opposes motion.
Explain what an accelerometer does.
