Grade 6 · Science
Combine forces along a line practice
Calculate a net force from stated opposite directions and distinguish balance from rest.
Opening your practice adventure…
Try a sample
An object is already moving at constant speed in a straight line. Its net force stays zero. Which prediction fits this ideal model?
- It keeps the same velocity.
- It must speed up.
- It must reverse direction.
- It must stop immediately.
See the answer & why
It keeps the same velocity.
Zero net force means no acceleration in the stated reference frame.
A little hint: Add forces in the same direction and subtract opposite forces; zero net force does not by itself mean zero speed.
A teaching tip
Add forces in the same direction and subtract opposite forces; zero net force does not by itself mean zero speed.