semester 1 formulas

Question 1

gradient of a line

Answer 1

rise/run (bigger y - smaller y / bigger x - smaller x)

Question 2

distance travelled in a V - T graph

Answer 2

area under the graph

Question 3

what gives acceleration in a V-T graph?

Answer 3

slope/gradient of graph

Question 4

weight

Answer 4

weight = mass x gravitational constant
(w=mg)

Question 5

acceleration

Answer 5

acceleration = final speed - initial speed / time
(v-u / t)

Question 6

density mass volume triangle?

Answer 6

top: mass
bottom: volume & density

Question 7

force, acceleration, mass triangle

Answer 7

top: force
bottom: acceleration & mass

Question 8

momentum of a force

Answer 8

momentum of a force = force x distance
(M=fx)

Question 9

kinetic energy

Answer 9

kinetic energy = 1/2 x mass x velocity^2
(KE = 1/2mv^2)

Question 10

gravitational potential energy

Answer 10

mass x gravitational constant x height
(GPE = mgh)

Question 11

mechanical energy

Answer 11

Kinetic Energy + Gravitational Potential Energy
(KE + GPE)

Question 12

△GPE

Answer 12

△Gravitational potential energy = mass x gravitational constant x △height
(△GPE = mg△h)

Question 13

work done is equal to?

Answer 13

work done = energy transferred

Question 14

work done / energy

Answer 14

work done = force x distance/displacement moved by the force OR weight x vertical distance moved
(△W = Fd OR △W = Weight x vertical distance moved)

Question 15

efficiency (work done and energy)

Answer 15

efficiency = useful work done / total energy input

Question 16

efficiency (power)

Answer 16

efficiency = useful power output / total power

Question 17

power, work done / energy, time triangle?

Answer 17

top: work done / energy
bottom: power & time

Question 18

useful power output

Answer 18

force x speed

Question 19

pressure

Answer 19

force / area force applied perpendicularly
(p = f/a)