OCR A level Physics Flashcards
0.0 / 5
- Created by: Bananaexcel 2.0
- Created on: 21-06-18 19:55
Resultant force
a single force which has the same effect as the sum of all the forces acting on the body
1 of 44
Newton
the force that causes a mass of 1kg to have an acceleration of 1ms^-2
2 of 44
Terminal velocity
when the upwards force becomes equal to the weight of a falling object which cause it's resultant force to be zero
3 of 44
Equilibrium
when all the forces acting on an object (coplanar forces, acting on the same plane) are balanced
4 of 44
Moment of a force
the product of a force and the perpendicular distance of its line of action
5 of 44
Principle of moments
the sum of the clockwise moments is equal to the sum of the anticlockwise moments
6 of 44
Conditions for equilibrium to take place
resultant force = 0 //principle of moments
7 of 44
Couple
when two equal, antiparallel forces act to produce a rotation
8 of 44
Torque
the product of one of the forces of a couple and the perpendicular distance between them
9 of 44
Centre of mass
the single point at which all the mass of the object can be assumed to be situated
10 of 44
Density
mass per unit volume // kgm^-3
11 of 44
Archimedes' principle
the upward buoyant force exerted on the object immersed in a fluid is equal to the weight of the fluid that the object displaces
12 of 44
Work
the product of the force and the distance moved by the force i the direction of movement
13 of 44
Principle of conservation of energy
the total energy of a closed system remains constant, energy cannot be created or destroyed. Only transferred from one form to another.
14 of 44
Power
rate of doing work // watts
15 of 44
Elasticity
property of a body to resume it's original shape/ size once the deforming force has been removed
16 of 44
Deformation
the change in shape or size of the object // elastic = returns to original shape // plastic = remains in new state
17 of 44
Hookes' Law
the extension of an object is proportional to the force that cause it, provided the elastic limit is not exceeded
18 of 44
Stress
force per unit cross-sectional area //Nm^-2 or Pa
19 of 44
Stress
extension per unit length
20 of 44
Ductile
material can be drawn into wires and will show plastic deformation under tensile stress before breaking
21 of 44
Malleable
material can be hammered or beaten into flat sheets and will show extensive plastic deformation when subjected to compressive forces
22 of 44
Brittle
will break with little or no plastic deformation
23 of 44
Hard
will resist plastic deformation by surface indentation or scratching
24 of 44
Stiffness
property: resist tensile forces
25 of 44
Polymeric material
made up of long chain molecules called polymers
26 of 44
Ultimate tensile strength
maximum stress a material can handle while being pulled or stretched before it breaks
27 of 44
Newtons' First Law
A body will remain at rest or constant velocity unless an external force acts on it
28 of 44
Newtons' Second Law
The resultant force of an object is proportional to the rate of change of momentum of the object, and the momentum change takes place in the direction of the force
29 of 44
Newtons' Third Law
If object A exerts a force on object B, object B will exert an equal and opposite force on object A
30 of 44
Principle of conservation of momentum
the total momentum before a collision is always equal to the total momentum after the collision, provided that no external forces act on it
31 of 44
e.m.f
Electromotive supply: a supply of energy gained per unit charge by charges passing through
32 of 44
p.d
the energy transferred per unit charge by the charges passing through the component
33 of 44
Ohms' law
the current through the conductor is directly proportional to the p.d, provided that the temperature remains constant
34 of 44
1kWh
3600 000J
35 of 44
Conservation of charge (Kirchhoff's first law)
the algebraic sum of the charges in a circuit must equal zero
36 of 44
Kirchhoffs' second law
the e.m.f provided by the cell must be the same as the total drop in pd across all of the resistors in a loop
37 of 44
Internal resistance
(in a source of e.m.f) is the resistance to electric current of the materials inside
38 of 44
Intensity of a wave
the rate at which energy is transferred from one location to another
39 of 44
Plane-polarised wave
oscillations of the field and the direction of travel are confined to a single plane
40 of 44
Polarising filter
produces plane polarised light by selective absorption of one component of the incident oscillations - the filter transmits only the component of light polarised perpendicular to that direction
41 of 44
Quantum
a small discrete unit of energy
42 of 44
Electronvolt
the KE gained by an electron when it accelerates through a p.d of 1 volt
43 of 44
Work function (of a metal)
minimum amount of energy required to just release an electron from its surface
44 of 44
Other cards in this set
Card 2
Front
the force that causes a mass of 1kg to have an acceleration of 1ms^-2
Back
Newton
Card 3
Front
when the upwards force becomes equal to the weight of a falling object which cause it's resultant force to be zero
Back
Card 4
Front
when all the forces acting on an object (coplanar forces, acting on the same plane) are balanced
Back
Card 5
Front
the product of a force and the perpendicular distance of its line of action
Back
Similar Physics resources:
0.0 / 5
0.0 / 5
0.0 / 5
0.0 / 5
0.0 / 5
0.0 / 5
5.0 / 5 based on 5 ratings
Comments
No comments have yet been made