SACS Definitions (Physics)
0.0(0)
Studied by 1 person
Call Kai
Learn
Practice Test
Spaced Repetition
Match
Flashcards
Knowt PlayCard Sorting
1/47
Earn XP
Last updated 2:30 PM on 10/22/24
Name | Mastery | Learn | Test | Matching | Spaced | Call with Kai |
|---|
No analytics yet
Send a link to your students to track their progress
48 Terms
1
New cards
What is a vector?
A physical quantity that has both magnitude and direction, e.g., velocity.
2
New cards
What is a scalar quantity?
A physical quantity that has magnitude only, e.g., temperature.
3
New cards
What is a resultant vector?
The single vector which has the same effect as the original vectors acting together.
4
New cards
Define distance.
The length of path travelled; it is a scalar quantity.
5
New cards
What is displacement?
The change in position; it is a vector quantity.
6
New cards
Define speed.
The rate of change of distance; it is a scalar quantity.
7
New cards
What is velocity?
The rate of change of position or displacement; it is a vector quantity.
8
New cards
Define acceleration.
The rate of change of velocity.
9
New cards
What is weight (Fg)?
The gravitational force the Earth exerts on any object on or near its surface.
10
New cards
Define normal force (FN).
The perpendicular force exerted by a surface on an object in contact with it.
11
New cards
What is frictional force (Ff)?
The force that opposes the motion of an object, acting parallel to the surface.
12
New cards
State Newton's first law.
An object continues in a state of rest or uniform velocity unless acted upon by a net force.
13
New cards
What is inertia?
The property of an object that causes it to resist a change in its state.
14
New cards
State Newton's second law.
When a net force is applied to an object, it accelerates in the direction of the net force.
15
New cards
What does Newton's second law state regarding acceleration?
The acceleration is directly proportional to the net force and inversely proportional to mass.
16
New cards
State Newton's third law.
When object A exerts a force on object B, B exerts an equal and opposite force on A.
17
New cards
Define linear momentum.
The product of the mass and velocity of the object.
18
New cards
How is Newton's second law expressed in terms of momentum?
The net force acting on an object is equal to the rate of change of momentum.
19
New cards
What is the law of conservation of linear momentum?
The total linear momentum of an isolated system remains constant.
20
New cards
Define an elastic collision.
A collision in which both momentum and kinetic energy are conserved.
21
New cards
What is an inelastic collision?
A collision in which only momentum is conserved.
22
New cards
Define impulse (J).
The product of the net force and the contact time.
23
New cards
Define work done on an object by a force.
The product of the displacement and the component of the force parallel to the displacement.
24
New cards
What is gravitational potential energy?
The energy an object possesses due to its position relative to a reference point.
25
New cards
Define kinetic energy.
The energy an object has as a result of its motion.
26
New cards
What is mechanical energy?
The sum of gravitational potential and kinetic energy at a point.
27
New cards
State the law of conservation of energy.
The total energy in a system cannot be created nor destroyed; only transformed.
28
New cards
What is the principle of conservation of mechanical energy?
In the absence of external forces, mechanical energy of an object is constant.
29
New cards
State the work-energy theorem.
The work done by a net force is equal to the change in kinetic energy of the object.
30
New cards
Define power.
The rate at which work is done or the rate at which energy is transferred.
31
New cards
What is the unit of power?
The watt (W); one watt is the power when one joule of work is done in one second.
32
New cards
Define efficiency.
The ratio of output power to input power.
33
New cards
State Newton's law of universal gravitation.
Every particle with mass attracts every other particle with a force proportional to their masses and inversely proportional to the square of the distance.
34
New cards
Weight (Fg)
Gravitational Force the Earth exerts on any object on or near its surface.
35
New cards
What is the gravitational field?
The force acting per unit mass.
36
New cards
State Coulomb's law in words.
Two charges exert forces on each other proportional to the product of the charges and inversely to the square of the distance between them.
37
New cards
Define the magnitude of the electric field.
The force per unit positive charge.
38
New cards
What is potential difference?
The work done per unit positive charge.
39
New cards
Define current.
The rate of flow of charge.
40
New cards
State Ohm's law.
Current through a conductor is directly proportional to the potential difference at constant temperature.
41
New cards
What is resistance?
A material's opposition to the flow of electric current.
42
New cards
Define emf.
The total energy supplied per coulomb of charge by a cell.
43
New cards
What is magnetic flux linkage?
The product of the number of turns on the coil and the magnetic flux through the coil.
44
New cards
State Faraday's law of electromagnetic induction.
The emf induced is directly proportional to the rate of change of magnetic flux.
45
New cards
State Lenz's law.
The induced current flows in a direction to oppose the change in magnetic flux.
46
New cards
Define a diode.
A component that allows current to flow in one direction only.
47
New cards
What is the threshold frequency (fo)?
The minimum frequency of incident radiation for electron emission from a metal.
48
New cards
Define work function (Wo).
The minimum energy needed to emit an electron from a metal surface.
Note 
Flashcards (125)