18 flashcards · Shared on 19 August 2026 by AtomAI Library
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Which expression gives the weight of an object near Earth's surface?
W = mg
Which expression gives the weight of an object near Earth's surface?
W = mg
What motion is possible when the net force on an object is zero?
Rest or motion with constant velocity
Which quantity is a measure of an object's inertia?
Mass
A car travels around a circular track at constant speed. Why is it accelerating?
Its direction of velocity is changing
For an object of constant mass, which equation expresses Newton's second law?
F_net = ma
A box is pushed to the right with 30 N while friction acts to the left with 10 N. What is the net horizontal force?
20 N to the right
Which statement best describes Newton's third law?
For every force one object exerts on another, the second exerts an equal and opposite force on the first
Why do the two forces in a Newton's third-law pair not cancel each other?
They act on different objects
A constant net force acts on an object. What happens to its acceleration if its mass is doubled?
It is halved
One newton is equivalent to which combination of SI base units?
1 kg·m/s²
Several forces act on an object. What is the net force?
The vector sum of all the forces
A book rests on a horizontal table. Which two forces balance on the book?
Its weight downward and the table's normal force upward
What is the SI unit of force?
Newton
A swimmer pushes water backward. Which interaction moves the swimmer forward?
The water exerts a forward force on the swimmer
What does Newton's first law state?
An object remains at rest or moves with constant velocity unless acted on by a nonzero net external force
In mechanics, what is inertia?
The tendency of an object to resist changes in its velocity
What determines the direction of an object's acceleration?
The direction of the net force
A net force of 12 N acts on a 3 kg object. What is the object's acceleration?
4 m/s²