Physics 1 Markers Flashcards
Learn 1 markers (36 cards)
Units of joule?
N m (newton metres?
Units of watt?
J s^-1 (joules per second)
Units of newton?
Kg m s^-2 (kilogram meters per second squared)
Scalar vs vector
Scalar: only has magnitude
Vector: has magnitude and direction
List 5 scalar and 3 vector quantities
Scalar: density, energy, time, power, speed,
Vector: acceleration, weight, displacement
State Hooke’s law.
Extension is proportional to force (applies as long ad elastic limit is not exceeded)
Explain what plastic deformation is.
Material is permemantly deformed, even after stress/force is removed.
Define “ultimate tensile strength” of a material.
Maximum stress a material can withstand before fracture.
State what the gradient of a force extenion graph represents?
Force constant/spring constant,
K.
How do you find work done on a force extension graph?
Area under line.
Define the Young Modulus of a material and state when it applies.
Stress/Strain.
As long as elastic limit isnt exceeded/hookes law obeyed/linear region of stress against strain graph.
What form of energy is stored in metal wire when it is extended by a force?
Elastic potential or strain(energy)
What is the forcd constant of a spring?
Force per unit extension.
State 2 pairs of scalar quantities with the same units.
Pressure and stress
Moment and torque
Energy and work done
What is meant by terminal velocity?
Max velocity of a falling object when drag=weight.
Define velocity.
Rate of change of displacement.
Define work done by a force.
Work done= force x distance moved in direction of force.
Define density.
Mass per unit volume.
Define newton.
Net force when 1kg of mass hass acceleration of 1 ms^2.
Define braking distance.
Distance travelled from time brakes are applied to stop of car.
State factors which increase braking distance.
Greater mass
Worn brakes/faulty
Road surface
Gradient of road
State principle of moments.
“For equilibrium of an object, clockwise moments=anticlockwise moments about the same point”
Define moment of a force.
Moment= force × perpendicular distance from point or pivot.
Does mass of a particle change as it approaches speed of light?
Yes, it increases.
