p1-p4 equations

Question 1

density

Answer 1

density (kg⁄m^3 )= mass (kg) / volume (m^3)

Question 2

distance travelled

Answer 2

distance travelled (m)=speed (m ⁄ s) ×time (s)

Question 3

kinetic energy

Answer 3

kinetic energy (J)=0.5 ×mass (kg)×(speed (m⁄(s))^2

Question 4

acceleration

Answer 4

acceleration (m⁄(s^2)= (change in velocity (m⁄(s)))/(time (s)))

Question 5

force

Answer 5

force (N)=mass (kg)×acceleration (m⁄(s))

Question 6

work done

Answer 6

work done (J)=force (N)×distance(m) 
                  (along the line of action of the force)

Question 7

power (in terms of work done and time)

Answer 7

power (W)= work done (J) / time (s)

Question 8

force exerted by a spring

Answer 8

force exerted by a spring (N)=extension (m)×spring constant (N⁄(m))

Question 9

gravity force

Answer 9

gravity force (N)=mass(kg)×gravitational field strength,g (N⁄(kg))

Question 10

Gravitational Potential energy

Answer 10

Gravitational Potential energy (J)=mass (kg)×height(m)×gravitational field strength,g(N⁄(kg))

Question 11

pressure

Answer 11

pressure (Pa)= force normal to a surface (N) / area of that surface (m^2)

Question 12

moment of a force

Answer 12

moment of a force (Nm)=force(N)×distance(m) (normal to direction of the force)

Question 13

charge flow

Answer 13

charge flow (C)=current (A)×time (s)

Question 14

potential difference

Answer 14

potential difference (V)=current (A)×resistance (Ω)

Question 15

energy transferred (in terms of charge and potential difference)

Answer 15

energy transferred (J)=charge (C)×potential difference (V)

Question 16

power (in terms of potential difference and current)

Answer 16

power (W)=potential difference (V)×current (A)

Question 17

power (in terms of current and resistance)

Answer 17

power (W)=((current(A))^2)×resistance (Ω)

Question 18

Momentum

Answer 18

Momentum (kgm/s) = mass (kg) x velocity (m/s)