Science · Grades 8–11
Newton’s second law
Use the net force and consistent SI units for a constant-mass object.
The key idea
Use the net force and consistent SI units for a constant-mass object.
F_net = ma
Worked examples
An object of mass 42 kg accelerates at 13 m/s². Find the net force in N.
42 × 13 = 546 N
546 N
An object of mass 47 kg accelerates at 14 m/s². Find the net force in N.
47 × 14 = 658 N
658 N
Try it yourself
An object of mass 15 kg accelerates at 10 m/s². Find the net force in N.
An object of mass 27 kg accelerates at 18 m/s². Find the net force in N.
Check your understanding
Answers and marking notes
- 150 N
15 × 10 = 150 N
- 486 N
27 × 18 = 486 N
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.