general physics

Question 1

average speed (m/s)

Answer 1

Distance(m)/time(s) s=d/t

Question 2

average velocity(m/s)

Answer 2

displacement(m)/time(s) v=d/t

Question 3

acceleration (m/s2)

Answer 3

final velocity - initial velocity/time a=Vf-Vi/t

Question 4

Weight (N)

Answer 4

mass(kg) x acceleration due to gravity (9.8m/s2) Wt=mg

Question 5

Force (N)

Answer 5

mass x acceleration (f=ma)

Question 6

Density (kg/m3)

Answer 6

mass/volume ρ=m/v

Question 7

hooke’s law force for springs

Answer 7

Force (N)= constant (n/m2) x extension (m8

Question 8

Pressure (Pa)

Answer 8

force(N)/area(m2) p=f/A

Question 9

Fluid pressure

Answer 9

density(kg/m3) x acceleration due to gravity (9.8m/s) x height (m) P=ρgh

Question 10

work (j)

Answer 10

force x distance w=fd

Question 11

power (watts)

Answer 11

work/time p=w/t

Question 12

kinetic energy (j)

Answer 12

1/2 x mass x velocity2 KE=1/2mv2

Question 13

gravitational potential energy (j)

Answer 13

mass x acceleration due to gravity x height GPE=mgh

Question 14

efficiency (%)

Answer 14

useful power output(w or j)/total power input(w or j) x 100% n=Pout/Pin x 100%

Question 15

moment (Nm)

Answer 15

force x perpendicular distance of pivot (m) M=fd

Question 16

Sum of clockwise motion(Nm) = sum of anticlockwise motion(Nm)

Answer 16

F1d1=F2d2

Question 17

Momentum (kg m/s)

Answer 17

mass x velocity p=mv

Question 18

impulsive force (N)

Answer 18

change in momentum/time F=deltap/t

Question 19

impulse (kg m/s2 or Ns)

Answer 19

change in momentum delta p = final momentum - initial mometum