vectors Flashcards
What is a vector?
a quantity having direction as well as magnitude, especially as determining the position of one point in space relative to another.
What is a scalar?
(of a quantity) having only magnitude, not direction.
give some examples of scalars
Temperature . Depending on the scale used (Celsius or Kelvin), each numerical value will represent an absolute magnitude of (presence or absence of) heat, so that 20 ° C constitute. The pressure. Length . Energy . The mass .
give some examples of vectors
Weight . The weight is a magnitude that expresses the force exerted by an object on a point of support, as a consequence of the local gravitational attraction. Force . Acceleration .
What do the length and direction of the arrows that you draw tell you about the vector?
magnitude (size) of the vector
What is a force?
strength or energy as an attribute of physical action or movement.
What unit are forces acting in?
A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F. The original form of Newton’s second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time.
What is a contact force?
A contact force is any force that requires contact to occur. Contact forces are ubiquitous and are responsible for most visible interactions between macroscopic collections of matter.
What is a non contact force?
A non-contact force is a force which acts on an object without coming physically in contact with it. The most familiar example of a non-contact force is gravity, which confers weight. In contrast a contact force is a force applied to a body by another body that is in contact with it. All four known fundamental interactions are non-contact forces
What is the normal contact force?
The normal force is the force that surfaces exert to prevent solid objects from passing through each other. Normal force is a contact force. If two surfaces are not in contact, they can’t exert a normal force on each other. For example, the surfaces of a table and a box cannot exert normal forces on each other if they are not in contact.
Give some examples of contact forces
Stretching of the spring of a balance
the pushing of a pram, kicking of a football, Pushing the door, Hitting the ball
Give some examples of non-contact forces
Diamagnetism, Ferromagnetism ,Paramagnetism, Antiferromagnetism, Electromagnetism
What is a free body force diagram?
In physics and engineering, a free body diagram (force diagram, or FBD) is a graphical illustration used to visualize the applied forces, movements, and resulting reactions on a body in a given condition. They depict a body or connected bodies with all the applied forces and moments, and reactions, which act on the body(ies).
Are forces scalars or vectors?
Force is a vector quantity. Vectors possess a magnitude and a direction – both properties are required to describe the vector. There are several vector quantities including: displacement (the distance and direction from where you started to where you finished)
How do you find the resultant force of two forces that are acting in opposite directions?
Two forces that act in opposite directions produce a resultant force that is smaller than either individual force. To find the resultant force subtract the magnitude of the smaller force from the magnitude of the larger force. The direction of the resultant force is in the same direction as the larger force.
