Correct Triangles

Question 1

Average speed (m / s)

Answer 1

Total distance covered (m) / time taken (s)

Question 2

Acceleration (m/s2)

Answer 2

Change in velocity (meters per second) / time taken for change (seconds)

Question 3

Force (newton, N)

Answer 3

Mass (kilogram, kg) x acceleration (m/s2)

Question 4

Weight (newton, N)

Answer 4

Mass (kilogram, kg) x gravitational field strength (newton/kilogram, N/kg)

Question 5

Moment (newton meter, Nm)

Answer 5

Force (newton, N) x perpendicular distance between line of action and pivot (meter, m)

Question 6

Orbital speed (m/s)

Answer 6

2 x pie x orbital radius (meters) / time (seconds)

Question 7

Power (watt, W)

Answer 7

Voltage (volt, V) x current (ampere, A)

Question 8

Energy transferred (joule, J)

Answer 8

Current (A) x voltage (V) x time (second, s)

Question 9

Voltage (volt, V) ohm’s law

Answer 9

Current (ampere, A) X resistance (ohm, omega symbol)

Question 10

Charge (coulomb, C)

Answer 10

Current (A) x time (s)

Question 11

Transformer equations

Answer 11

Input voltage / output voltage = number of turns on primary coil / number of turns on secondary coil

Input power (watts, W) = output power (watts, W)

Question 12

Wave speed (meters per second)

Answer 12

Frequency (hertz, Hz) X wavelength (meter, m)

Question 13

Frequency (hertz, Hz)

Answer 13

1 / time period (seconds, s)

Question 14

Refractive index

Answer 14

Sin i / Sin r

Question 15

Efficiency

Answer 15

Useful energy transferred by device / total energy supplied to device

Question 16

Work done (joules, J)

Answer 16

Force applied (newton, N) X distance moved in direction of force (metre, m)

Work done = energy transferred

Question 17

Gravitational potential energy (joule, J)

Answer 17

Mass (kilogram, kg) x gravitational field strength (newton per kilogram, N / kg) x height (metre, m)

Question 18

Kinetic energy (joule, J)

Answer 18

1/2 x mass (kg) x (speed)2 [(metre per second)2]

Question 19

Power (watt, W)

Answer 19

Work done (joule, J) / time taken (second, s)

Question 20

Density (kg / m3)

Answer 20

Mass (kg) / volume (m3)

Question 21

Pressure (Pa)

Answer 21

Force (N) / area (m2)

1 Pa = 1 N / m2

Question 22

Pressure difference (Pascal)

Answer 22

Height (m) x density (kilogram per cubic meter) x gravitational field strength (newton per kilogram, N / kg)

Question 23

Boyle’s law

Answer 23

Pressure 1 (Pa) x volume 1 (m3) = pressure 2 (Pa) x volume 2 (m3)

Question 24

Charles’ Law

Answer 24

Pressure 1 (Pa) / temperature 1 (kelvin, K) = pressure 2 (Pa) / temperature 2 (kelvin, K)