NLN PAX Science: Physics Questions
and Answers Already Passed
aim of physics ✔✔to understand the physical laws and principles that influence every aspect of
daily life
displacement of an object ✔✔the distance that an
...
NLN PAX Science: Physics Questions
and Answers Already Passed
aim of physics ✔✔to understand the physical laws and principles that influence every aspect of
daily life
displacement of an object ✔✔the distance that an object is from some starting point, and is
measured in units of length
How does displacement change when an object is in motion? ✔✔it is constantly changing
How is motion described? ✔✔by displacement, velocity (speed) and acceleration
speed ✔✔distance traveled by an object per unit of time
speed = (distance traveled/time)
velocity ✔✔speed in a given direction
What two things does velocity tell us about a moving object? ✔✔its speed and direction
acceleration ✔✔the rate of change in velocity; can be any change in velocity, either positive or
negative.
deceleration ✔✔negative acceleration or a decrease in velocity and can change in direction
How is acceleration calculated? ✔✔(final velocity-original velocity)/time
Why can velocity and acceleration be described using vectors? ✔✔because they have both
magnitude and direction
What quality do all moving objects have? ✔✔momentum; an object traveling at a specific velocity
has momentum
calculate momentum ✔✔Momentum = mass x velocity
conservation of momentum ✔✔the total movement of an isolated system is always constant, ie
during a collision, the momentum of each body changes but the total momentum is conserved. One
object may lose momentum, but this momentum is gained by other object
How is momentum conserved when a moving object hits a stable object, such as a bullet hitting a
wall? ✔✔the moving object, like the bullet, delivers an impulse to the wall, and this impulse is
said to be the change in the objects momentum
Newton's first law ✔✔objects in motion tend to stay in motion and objects at rest tend to stay at
rest
inertia ✔✔the property of matter that resists any change in motion
Newton's second law ✔✔describes the relationship between force, mass and acceleration; the force
of an object equals the mass of the object times its acceleration
f = ma
newton ✔✔the unit that represents a force that accelerates a mass of 1 kg 1 meter per second
friction ✔✔force that is exerted on an obj
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