Physics Equations

Question 1

Gravitational Force

Answer 1

F = mg

Units: N

Question 2

Electrostatic Force

Answer 2

F = kQq/r^2

Units: N

Question 3

Kinetic Energy

Answer 3

KE = 1/2 * mv^2

Units: J

Question 4

Potential Energy

Answer 4

PE = mgh OR PE = kQq/r

Units: J

Question 5

Mechanical Work

Answer 5

W= Fdcosθ

Units: J

Question 6

Translational Motion

Answer 6

The Big 4

d = vi*t + 1/2 at^2
d= (vi + vf / 2) * t
vf= vi + at
vf^2 = vi^2 + 2ad

Question 7

cos90

Answer 7

= sin 0

= 0

Question 8

cos60

Answer 8

=sin30

= sqrt(1) / 2

Question 9

cos45

Answer 9

= sin45

= sqrt (2) / 2

Question 10

cos30

Answer 10

= sin60

= sqrt (3) / 2

Question 11

cos0

Answer 11

= sin90

= 1

Question 12

Vf =

Answer 12

= vo + at

Question 13

Vf^2 =

Answer 13

= vo^2 + 2ad

Question 14

d =

Answer 14

= vi*t + 1/2 at

= (vi + vf / 2) * t

Question 15

F =

Answer 15

= ma

= -kΔx

Question 16

Fg =

Answer 16

GMm/r^2

Question 17

Mechanical Advantage =

Answer 17

= Fout / Fin

Question 18

Efficiency =

Answer 18

= Wout / Win

Question 19

F =

Answer 19

= -kΔx

= ma

Question 20

Ff =

Answer 20

= uFn

Question 21

t =

Answer 21

r Fsin θ

Question 22

KE =

Answer 22

1/2 mv^2

Question 23

P =

Answer 23

W / t

Question 24

Wnet =

Answer 24

ΔEk

Question 25

W =

Answer 25

F d cosθ

Question 26

Espring =

Answer 26

1/2 kx^2

Question 27

Egrav =

Answer 27

mgh

Question 28

VoSinθ

Answer 28

= sqrt (2 g h)

= Vyi

Question 29

VoCosθ

Answer 29

= Vxi

= Vxf

Question 30

Vy @ max h

Answer 30

= 0 m/s

Question 31

ax

Answer 31

= 0 m/s

Question 32

ay

Answer 32

= - 10 m/s

Question 33

F applied

Answer 33

= T1 = T2 = T3

= 1/3 (Mg)

Question 34

T1 + T2 + T3

Answer 34

= Mg

Question 35

Mechanical Advantage (of T1, T2, T3)

Answer 35

= Mg / F applied

= 3 / 1

Question 36

Angular Frequency of an Oscillating Spring

Answer 36

w = sqrt ( k / m)

Where k is the spring constant (stiffness)

Question 37

Amplitude of a Spring Oscillation

Answer 37

= 1/2 mv^2 + mgh

Question 38

Total Mechanical Energy of a Springs system

Answer 38

= 1/2 kx^2 + mgh

Question 39

Hooke’s Law

Answer 39

F = -kx

(the restoring force in a spring is linearly related to the degree of displacement from the equilibrium position of the spring)