Forces and energy

Question 1

What is the formula for

Force

Answer 1

F = ma
force = mass × acceleration

N = kg × m/s²

Question 2

What is the formula for

Moment of a force

Answer 2

Moment of a force = force × perpendicular distance from pivot to force

N m = N × m

Question 3

What is the formula for

Pressure

Answer 3

p = F / A
pressure = force / area

Pa = N / m²

Question 4

What is the formula for

Gravitational potential energy

Answer 4

g.p.e. = mg × h
gravitational potential energy = weight × height

J = kg × (10)m/s² × m
J = N × m

Question 5

What is the formula for

Kinetic energy

Answer 5

k.e. = mv² / 2
kinetic energy = mass × speed² / 2

J = kg × (m/s)² / 2

Question 6

What is the formula for

Work done by a force

Answer 6

W = F × d
work = force × distance moved by the force in the direction of the force

J = N × m

Question 7

What is the formula for

Power

(Using energy transferred and time)

Answer 7

P = ∆E / t
power = energy transferred / time taken

W = J / s