Question

Newton’s first law states that if an objects velocity is changing a _____ must be acting on it.

Answer 1

Answer:

(a)

Explanation

• Newtons First Law can be written as the formula

$f = ma$

since acceleration is the changing of velocity as its formula is

$\frac{v2 - v1}{t}$

Thus, a force must be acting on an accelerating/decelerating object

• It is not mass as the mass does not act on the object but rather the mass is acting on the surface of the ground.

• Changing velocity is already acceleration

• inertia is the term used to describe Newtons first law