# Can a constant force cause variable acceleration? [closed]

Can a constant force cause variable acceleration? I think that the answer is no. How can a force cause variable acceleration?

• Maybe you should link the article?
– Puk
Jun 15, 2020 at 1:03
• As Puk suggested, unless you can recapitulate the rationale or link to the article, this question doesn't make much sense as it stands. Voting to close, notify me if you edit the question to include more substance.
– user87745
Jun 15, 2020 at 1:05
• $F=ma$ If $F$ is constant and $m$ is constant, the $a$ must be constant. Sometimes $m$ isn't constant, such as when a rocket becomes lighter as it uses fuel. Is that what you are thinking? Jun 15, 2020 at 1:17
• Dvij D.C I was unable to link the article so i have removed that part. Jun 16, 2020 at 1:20

Newton's second law reads $$\vec{F}=m\vec{a}$$, so in Newtonian mechanics, if the force is constant, mass must change if acceleration is to change. As an example, consider a rocket propelled by a constant force in space, expending fuel as this happens. Even though the force is the same, the rocket gets lighter over time, and accelerates faster and faster.