Question: Tom and Bill were both pushing on a large plastic ball but it stayed in one place. Why?
Choices:
text: the ball was being stubborn
label: A
text: the ball was large and made of iron
label: B
text: they were pushing from opposite sides using the same muscle power
label: C
text: the ball was 2 miles across
label: D
Answer: C
Fact: if two equal forces in opposite directions act on an object then that object will stay in the same place