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What quantity determines how an object's motion changes?
A
The resultant force.
B
Newton's second law is ∑F=ma\sum \mathbf{F}=m\mathbf{a}∑F=ma, and acceleration acts in the same direction as the resultant force.
C
Perpendicular to the contact surface.
D
Every external force acting on one isolated object.
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4.9.1 Forces and Newton's laws (A-level only) Flashcards
23 flashcards on WJEC A Level Maths 4.9.1 Forces and Newton's laws (A-level only): the key formulae, methods and definitions you need to recall for AS Unit 1, AS Unit 2, A2 Unit 3 and A2 Unit 4.