Year 10 Flashcards
What is the equation used to determine weight?
Weight (N) = mass (kg) x gravitational field strength (N/kg)
An astronaut has a mass of 70 kg, what do they weigh on Earth?
700N
What is Earth’s gravitational field strength?
10 N/kg (technically 9.8)
What is the Moon’s gravitational field strength?
1.6 N/kg
What does a 100kg astronaut weigh on the moon?
160 N/kg
What is the gradient of a distance-time graph?
Speed.
What is the gradient of a speed-time graph?
Acceleration.
What is the gradient of an acceleration-time graph?
The jerk.
What is the gradient of a jerk-time graph?
The snap or jounce.
What is Newton’s second law?
F = ma
What is the equation for a straight-line graph?
y = mx + c
What is stopping distance?
Thinking distance + braking distance
What factors affect thinking distance?
Condition of driver (DUI, etc.), visibility, speed of approaching object.
What is the change in momentum called
Impulse
Momentum equation
p = mv
a symbol?
Acceleration
s symbol in physics?
Displacement (distance)
In maths: d = st
In physics: s = vt
Equation for force
F = ma
Equation for change in velocity with constant acceleration
v^2 = u^2 + 2as
Equation for acceleration
a = (v - u) / t
Remember in the test
write in detail.
Define a Sankey diagram
an efficiency diagram - wasted coming out the bottom, useful continuing along the top
efficiency formula
efficiency (%) = (output / input) x 100
Equation for power
Power (watts) = Work done (joules) / time (seconds)
Equation for gravitational potential energy
Gravitational Potential Energy (joules) = mass (kg) x gravitational field strength (N/kg) x height (m)
Equation for kinetic energy
Kinetic Energy (joules) = 1/2 x mass (kg) x speed squared (m/s)
Equation for work done
Work done (joules) = force (N) x displacement (m)
3 types of heat transfer
Convection - through gas or liquid -requires matter
Conduction - through solid - requires matter
Radiation - through EM waves - doesn’t require matter
Definition of insulator
A material that does not conduct heat well
Definition of conductor
A material that does allow heat to pass through it
brownian motion?
non-visible particles colliding w/ visible ones
evidence for the particle model
density equation
density in kg/m^3 (ρ) = mass in kg (m) / volume in m^3 (V)
specific heat capacity equation
E = mcΔT
pressure equation
pressure in Pa (p) = force in N (F) / area in m^2 (A)
change in pressure equation
Δp = ρ x g x Δh
boyle’s law
P (subscript) 1 x V (subscript) 1 = P (subscript) 2 x V (subscript) 2
force + spring constant
Force (N) = k (N/m) * e (m)
