General

Question 1

What is the word equation for W=Fxd?

Answer 1

Work done (joules) = force (newtons / N) x distance (metres / m)

Question 2

What is the word equation for “delta”Ep = mg x “delta”h (delta means change in)?

Answer 2

Gravitational potential energy (joules) = weight (newtons / N) x change of height (metres / m)

Question 3

What is the word equation for Ek = 0.5 x m x v2?

Answer 3

Kinetic energy (joules) = 0.5 x mass (kg) x speed2 (m/s)

Question 4

How do you find out the percentage of efficiency?

Answer 4

Effeciency = useful output of energy (joules) divided by total input energy (joules) x 100

e=useful / total x 100

Question 5

What is the word equation for P=E/t?

Answer 5

Power (watts / W) = energy transferred (joules) / time (seconds)

Question 6

What is the word equation for p=m/v? (This is not the leeter p but the greek letter “rho”)

Answer 6

Density (kg/m3) = mass (kg) / volume (m3)

Question 7

What is the word equation for M=Fxd?

Answer 7

Moment = force x distance

Question 8

What is the equation for moments in equilibrium?

Answer 8

F1 x d1 = F2 x d2 (F can be replaced for weight (W))

Question 9

What is the word equation for F=mxa? (Inertia)

Answer 9

Resultant force = mass x acceleration

Question 10

What is the word equation for W=mxg?

Answer 10

Weight = mass x gravitational field strength (9.81 N/kg or 10 N/kg)

Question 11

What is the word equation for F=kxe?

Answer 11

Force applied to a spring = spring constant x extension

Question 12

What is the word equation for p=mxv?

Answer 12

Momentum = mass x velocity

Question 13

What is the word equation for F=mx”delta”v / t?

Answer 13

Force = mass x change in velocity / time taken

Question 14

What is the word equation for p=F/A

Answer 14

Pressure = force/area

Question 15

What is the word equation for p=hx”rho”xg?

Answer 15

Pressure in a water colomn = height x density x gravitational field strength