Force and acceleration

A [blank_start]body[blank_end] stays at [blank_start]rest[blank_end], or if moving it continues to move with [blank_start]uniform[blank_end] velocity, unless an [blank_start]external[blank_end] force makes it [blank_start]behave[blank_end] differently.

The mass of a body measures its inertia.

1N = [blank_start]1 kg m/s^2[blank_end]

F = [blank_start]ma[blank_end]

Newton's second law states that [blank_start]force[blank_end] = [blank_start]mass[blank_end] x [blank_start]acceleration[blank_end], when the force is in [blank_start]newtons[blank_end], the mass in [blank_start]kilograms[blank_end] and the acceleration is in [blank_start]metres per second squared[blank_end].

When using Newton's [blank_start]second[blank_end] law, [blank_start]two[blank_end] points should be noted. The law also shows that [blank_start]a[blank_end] will be largest when [blank_start]F[blank_end] is large and [blank_start]m[blank_end] small.

Weight = [blank_start]mass[blank_end] x [blank_start]acceleration of free fall[blank_end]

W = [blank_start]mg[blank_end]

The [blank_start]strength[blank_end] of a gravitational field is defined as the [blank_start]force[blank_end] acting on unit [blank_start]mass[blank_end] in the field.

N/kg = [blank_start]m/s^2[blank_end]

'g' can be described as acceleration of free fall or as the Earth's gravitational field.

An object's constant velocity is called [blank_start]terminal[blank_end] velocity.