Physics

Question 1

Include SI Units: What is the equation for distance travelled?

Answer 1

Distance travelled (m)= Average speed {m/s}x time {s}

Question 2

Include SI Units: What is the equation for acceleration?

Answer 2

Acceleration {m/s^2} = (final velocity-initial velocity){m/s}/time {s}

Question 3

Include SI Units: What is the equation for final velocity^2 - initial velocity^2?

Answer 3

Final velocity ^2 - initial velocity ^2 = 2 x acceleration x distance

Question 4

Include SI Units: What is the equation for resultant force?

Answer 4

Resultant force {Newtons} = mass {kg} x acceleration {m/s^2}

Question 5

Include SI Units: What is the equation for weight?

Answer 5

Weight {N} = mass {kg} x gravitational field strength {N/kg}

Question 6

When two objects interact, the forces they exert on each other are…

Answer 6

… equal and opposite

Question 7

Include SI Units: What is the equation for momentum?

Answer 7

Momentum {kg m/s} = mass {kg} x velocity {m/s}

Question 8

What is the concept behind the equation total momentum before = total momentum after?

Answer 8

Conservation of momentum (in a closed system)

Question 9

What is the equation for force?

Answer 9

Force = change in momentum / time

Question 10

What is the equation for stopping distance?

Answer 10

Stopping distance = thinking distance + braking distance

Question 11

Include SI Units: What is the equation for kinetic energy?

Answer 11

Kinetic energy (J) = 0.5 x mass (kg) x (speed)^2 {m/s}^2

Question 12

Include SI Units: What is the equation for change in gravitational potential energy?

Answer 12

Change in gravitational potential energy (J) = mass (kg) x gravitational field strength (N/kg) x change in vertical height (m)

Question 13

Include SI Units: What is the equation for efficiency?

Answer 13

Efficiency = useful energy transferred by device (J) / total energy supplied to device (J)

Percentage = Ans x 100

Question 14

Include SI Units: What are the equations for wave speed?

Answer 14

Wave speed (m/s) = frequency (hz) x wavelength (m)
OR
Wave speed (m/s) = distance (m) / time (s)

Question 15

What is half life?

Answer 15

Average time it takes for the number of radioactive nuclei in an isotope to halve

Question 16

Include SI Units: What is the equation for work done?

Answer 16

Work done (J) = force (N) x distance moved in the direction of the force (m)

Question 17

Include SI Units: What is the equation for power?

Answer 17

Power (w) = work done (J) / time taken (s)

Question 18

Include SI Units: What is the equation for charge?

Answer 18

Charge (coulombs) = current (amps) x time (seconds)

Question 19

Include SI Units: What is the equation for energy transferred

Answer 19

Energy transferred (J) = charge moved (c) x potential difference (v)

Question 20

Include SI Units: What is the equation for potential difference?

Answer 20

Potential difference (volts) = current (amps) x volts (volts) x time (s)

Question 21

Include SI Units: What is the equation for power?

Answer 21

Power (W) = energy transferred (J) / time (s)

Question 22

Include SI Units: What is the equation for electrical power?

Answer 22

Electrical power (watts) = current^2 (A) x resistance (Ohms)

Question 23

Include SI Units: What is the equation for force?

Answer 23

Force (N) = magnetic flux density (N/AM) x current (A) x length (m)

Question 24

What is the equation describing power output at primary and secondary coils?

Answer 24

Potential difference across primary coil x current through primary coil = potential difference across secondary coil x current through secondary coil

Question 25

Include SI Units: What is the equation for density?

Answer 25

Density (g/cm^2 OR kg/m^2) = mass / volume

Question 26

Include SI Units: What is the equation for change in thermal energy?

Answer 26

Change in thermal energy (J) = mass (Kg)x specific heat capacity (J/kgC) x temperature change (C)

Question 27

Include SI Units: What is the equation for thermal energy?

Answer 27

Thermal energy (J) = mass (Kg) x specific latent heat (J/kg)

Question 28

0*C = ? Kelvin

Answer 28

273 kelvin

Question 29

Include SI Units: What is the equation for applied force?

Answer 29

Applied force (N) = spring constant (N/m) x extension (m)

• extension is directly proportional to force
• this stops working when the force is great enough

Question 30

Include SI Units: What is the equation for energy transferred in stretching?

Answer 30

Energy transferred in stretching (J) = 1/2 x spring constant (n/m) x extension^2 (m^2)