NLN PAX Science: Physics Exam
Questions With Verified Correct
Answers.
aim of physics -Answer to understand the physical laws and principles that influence every
aspect of daily life
displacement of an object -Answer 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? -Answer it is constantly changing
How is motion described? -Answer by displacement, velocity (speed) and acceleration
speed -Answer distance traveled by an object per unit of time
speed = (distance traveled/time)
velocity -Answer speed in a given direction
What two things does velocity tell us about a moving object? -Answer its speed and direction
acceleration -Answer the rate of change in velocity; can be any change in velocity, either
positive or negative.
deceleration -Answer negative acceleration or a decrease in velocity and can change in
direction
How is acceleration calculated? -Answer (final velocity-original velocity)/time
Why can velocity and acceleration be described using vectors? -Answer because they have
both magnitude and direction
, calculate momentum -Answer Momentum = mass x velocity
conservation of momentum -Answer 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? -Answer 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 -Answer objects in motion tend to stay in motion and objects at rest tend to
stay at rest
inertia -Answer the property of matter that resists any change in motion
Newton's second law -Answer 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 -Answer the unit that represents a force that accelerates a mass of 1 kg 1 meter per
second
friction -Answer force that is exerted on an object along a surface or whenever an object has a
velocity along a surface and the two surfaces touch
gravity -Answer the force of attraction between all objects in the universe
what determines the weight of an object? -Answer the pull of gravity on an object
Why is the Earth's gravitational force great? -Answer because the Earth has a large mass
Is the force due to gravity and the acceleration of an object towards earth the same? -Answer
the force due to gravity is not the same on every object and depends upon the object's mass,
Questions With Verified Correct
Answers.
aim of physics -Answer to understand the physical laws and principles that influence every
aspect of daily life
displacement of an object -Answer 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? -Answer it is constantly changing
How is motion described? -Answer by displacement, velocity (speed) and acceleration
speed -Answer distance traveled by an object per unit of time
speed = (distance traveled/time)
velocity -Answer speed in a given direction
What two things does velocity tell us about a moving object? -Answer its speed and direction
acceleration -Answer the rate of change in velocity; can be any change in velocity, either
positive or negative.
deceleration -Answer negative acceleration or a decrease in velocity and can change in
direction
How is acceleration calculated? -Answer (final velocity-original velocity)/time
Why can velocity and acceleration be described using vectors? -Answer because they have
both magnitude and direction
, calculate momentum -Answer Momentum = mass x velocity
conservation of momentum -Answer 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? -Answer 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 -Answer objects in motion tend to stay in motion and objects at rest tend to
stay at rest
inertia -Answer the property of matter that resists any change in motion
Newton's second law -Answer 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 -Answer the unit that represents a force that accelerates a mass of 1 kg 1 meter per
second
friction -Answer force that is exerted on an object along a surface or whenever an object has a
velocity along a surface and the two surfaces touch
gravity -Answer the force of attraction between all objects in the universe
what determines the weight of an object? -Answer the pull of gravity on an object
Why is the Earth's gravitational force great? -Answer because the Earth has a large mass
Is the force due to gravity and the acceleration of an object towards earth the same? -Answer
the force due to gravity is not the same on every object and depends upon the object's mass,
