NLN PAX Science: Physics |130 QUESTIONS| WITH COMPLETE SOLUTION
aim of physics Correct Answer: to understand the physical laws and principles that influence
every aspect of daily life
displacement of an object Correct 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? Correct Answer: it is constantly
changing
How is motion described? Correct Answer: by displacement, velocity (speed) and acceleration
speed Correct Answer: distance traveled by an object per unit of time
speed = (distance traveled/time)
velocity Correct Answer: speed in a given direction
What two things does velocity tell us about a moving object? Correct Answer: its speed and
direction
acceleration Correct Answer: the rate of change in velocity; can be any change in velocity,
either positive or negative.
deceleration Correct Answer: negative acceleration or a decrease in velocity and can change in
direction
How is acceleration calculated? Correct Answer: (final velocity-original velocity)/time
Why can velocity and acceleration be described using vectors? Correct Answer: because they
have both magnitude and direction
What quality do all moving objects have? Correct Answer: momentum; an object traveling at a
specific velocity has momentum
calculate momentum Correct Answer: Momentum = mass x velocity
conservation of momentum Correct 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? Correct 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 Correct Answer: objects in motion tend to stay in motion and objects at rest
tend to stay at rest
inertia Correct Answer: the property of matter that resists any change in motion
Newton's second law Correct 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 Correct Answer: the unit that represents a force that accelerates a mass of 1 kg 1 meter
per second
friction Correct 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 Correct Answer: the force of attraction between all objects in the universe
what determines the weight of an object? Correct Answer: the pull of gravity on an object
Why is the Earth's gravitational force great? Correct Answer: because the Earth has a large mass
Is the force due to gravity and the acceleration of an object towards earth the same? Correct
Answer: the force due to gravity is not the same on every object and depends upon the object's
mass, and the acceleration toward earth is the same for all objects, independent of their mass
How does a change in the force of gravity change an objects weight and mass? Correct Answer:
it changes the object's weight but not its mass
density Correct Answer: d=m/v
What is torque and what does it measure? Correct Answer: the perpendicular force times the
lever arm; the ability of a force that is applied perpendicularly to rotate an object around an axis,
ie using a wrench to turn a bolt
What is centripetal force? Correct Answer: continual force on an object pulling it towards the
center of the circle
What does Newton's third law state? Correct Answer: that for every action there is an equal and
opposite reaction
What is energy? Correct Answer: the ability to do work?
What are the two types of energy? Correct Answer: 1. Kinetic energy
2. Potential energy
aim of physics Correct Answer: to understand the physical laws and principles that influence
every aspect of daily life
displacement of an object Correct 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? Correct Answer: it is constantly
changing
How is motion described? Correct Answer: by displacement, velocity (speed) and acceleration
speed Correct Answer: distance traveled by an object per unit of time
speed = (distance traveled/time)
velocity Correct Answer: speed in a given direction
What two things does velocity tell us about a moving object? Correct Answer: its speed and
direction
acceleration Correct Answer: the rate of change in velocity; can be any change in velocity,
either positive or negative.
deceleration Correct Answer: negative acceleration or a decrease in velocity and can change in
direction
How is acceleration calculated? Correct Answer: (final velocity-original velocity)/time
Why can velocity and acceleration be described using vectors? Correct Answer: because they
have both magnitude and direction
What quality do all moving objects have? Correct Answer: momentum; an object traveling at a
specific velocity has momentum
calculate momentum Correct Answer: Momentum = mass x velocity
conservation of momentum Correct 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? Correct 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 Correct Answer: objects in motion tend to stay in motion and objects at rest
tend to stay at rest
inertia Correct Answer: the property of matter that resists any change in motion
Newton's second law Correct 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 Correct Answer: the unit that represents a force that accelerates a mass of 1 kg 1 meter
per second
friction Correct 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 Correct Answer: the force of attraction between all objects in the universe
what determines the weight of an object? Correct Answer: the pull of gravity on an object
Why is the Earth's gravitational force great? Correct Answer: because the Earth has a large mass
Is the force due to gravity and the acceleration of an object towards earth the same? Correct
Answer: the force due to gravity is not the same on every object and depends upon the object's
mass, and the acceleration toward earth is the same for all objects, independent of their mass
How does a change in the force of gravity change an objects weight and mass? Correct Answer:
it changes the object's weight but not its mass
density Correct Answer: d=m/v
What is torque and what does it measure? Correct Answer: the perpendicular force times the
lever arm; the ability of a force that is applied perpendicularly to rotate an object around an axis,
ie using a wrench to turn a bolt
What is centripetal force? Correct Answer: continual force on an object pulling it towards the
center of the circle
What does Newton's third law state? Correct Answer: that for every action there is an equal and
opposite reaction
What is energy? Correct Answer: the ability to do work?
What are the two types of energy? Correct Answer: 1. Kinetic energy
2. Potential energy
