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Assessment
What is Newton's first law of motion?
An object at rest will remain at rest unless acted upon by an external force.
Force equals mass times acceleration.
For every action, there is an equal and opposite reaction.
Energy cannot be created or destroyed, only transformed.
Which of the following is a consequence of Newton's law of universal gravitation?
All objects in free fall accelerate at the same rate regardless of mass.
A force is needed to change an object's state of motion.
The gravitational force between two objects depends on their masses and the distance between them.
The acceleration of an object is inversely proportional to its mass.
Which quantity is conserved when two objects collide elastically?
Momentum and energy.
Only momentum.
Only kinetic energy.
Neither momentum nor energy.
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