PHYS 1010 - Exam 1 2025 with correct answers
Three fundamental properties - Answer-Mass
Length
Time
/.Mass - Answer-the amount of matter or "physical substance" which an object or group
of objects possesses
/.Length - Answer-the distance between two points in space
/.time - Answer-the period or interval between two events
/.Unit of mass - Answer-the kilogram
*on the earth, 1 kg has a weight of 9.8 newtons. this is approximately 2.2 lb.
/.Unit of length - Answer-the meter
*1 m is approximately 3.28 ft
1 m = 100 cm
1 km = 1000 m
/.unit of time - Answer-the second
*60s = 1 min etc
/.Speed - Answer-the rate at which someone or thing is able to move or operate
V=D/t
/.equation for speed - Answer-V=D/t
V=speed
D=distance
t=time
/.velocity - Answer-the speed of something in a given direction
/.3 ways to change velocity - Answer-1- changing speed
2- changing the direction
3- changing the direction AND speed
/.acceleration - Answer-increase in the rate or speed of something; basically how
quickly velocity changes (change in speed, acceleration, direction)
/.equation for acceleration - Answer-a=v/t
, a=acceleration
v=velocity
t=time interval
/.Newton's 1st law of motion - Answer-an object at rest stays at rest and an object in
motion stays in motion with the same speed and in the same direction unless acted
upon by an unbalanced force
/.Newton's 2nd law of motion - Answer-the acceleration of an object as produced by a
net force is directly proportional to the magnitude of the net force, in the same direction
as the net force, and inversely proportional to the mass of the object
/.equation for Newton's 2nd law - Answer-A=F/m
A=acceleration
f=force
m=mass
/.relationship between mass and weight - Answer-in the absence of acceleration, mass
and weight are directly proportional to each other. if the mass of an object is doubled, its
weight is also doubles; if the mass is halved, the weight is halved. w=m
/.Newton's 3rd law of motion - Answer-whenever one object exerts a force on a second
object, the second object exerts an equal and opposite force on the first
/.consistent with newton's 3rd law, what 4 conditions do all forces satisfy? - Answer-
properties of forces (always true)
- occur in pairs
- equal in strength
- opposite in direction
- two different objects
/.Nature of freefall - Answer-(no air resistance or other retarding forces) if the only force
acting on an object is gravity, then the acceleration will be determined by the single
force
/.numerical value of acceleration due to gravity - Answer-ft/s^2: g=32 ft/s^2
m/s^2: g=9.8 m/s^2
/.does g depend on the mass of the object? - Answer-no, it determines the force, not the
acceleration
/.does g depend on the motion of the object? - Answer-no, the motion of the object does
not effect the acceleration
*acceleration is not the same as velocity
*acceleration is constant and downward
Three fundamental properties - Answer-Mass
Length
Time
/.Mass - Answer-the amount of matter or "physical substance" which an object or group
of objects possesses
/.Length - Answer-the distance between two points in space
/.time - Answer-the period or interval between two events
/.Unit of mass - Answer-the kilogram
*on the earth, 1 kg has a weight of 9.8 newtons. this is approximately 2.2 lb.
/.Unit of length - Answer-the meter
*1 m is approximately 3.28 ft
1 m = 100 cm
1 km = 1000 m
/.unit of time - Answer-the second
*60s = 1 min etc
/.Speed - Answer-the rate at which someone or thing is able to move or operate
V=D/t
/.equation for speed - Answer-V=D/t
V=speed
D=distance
t=time
/.velocity - Answer-the speed of something in a given direction
/.3 ways to change velocity - Answer-1- changing speed
2- changing the direction
3- changing the direction AND speed
/.acceleration - Answer-increase in the rate or speed of something; basically how
quickly velocity changes (change in speed, acceleration, direction)
/.equation for acceleration - Answer-a=v/t
, a=acceleration
v=velocity
t=time interval
/.Newton's 1st law of motion - Answer-an object at rest stays at rest and an object in
motion stays in motion with the same speed and in the same direction unless acted
upon by an unbalanced force
/.Newton's 2nd law of motion - Answer-the acceleration of an object as produced by a
net force is directly proportional to the magnitude of the net force, in the same direction
as the net force, and inversely proportional to the mass of the object
/.equation for Newton's 2nd law - Answer-A=F/m
A=acceleration
f=force
m=mass
/.relationship between mass and weight - Answer-in the absence of acceleration, mass
and weight are directly proportional to each other. if the mass of an object is doubled, its
weight is also doubles; if the mass is halved, the weight is halved. w=m
/.Newton's 3rd law of motion - Answer-whenever one object exerts a force on a second
object, the second object exerts an equal and opposite force on the first
/.consistent with newton's 3rd law, what 4 conditions do all forces satisfy? - Answer-
properties of forces (always true)
- occur in pairs
- equal in strength
- opposite in direction
- two different objects
/.Nature of freefall - Answer-(no air resistance or other retarding forces) if the only force
acting on an object is gravity, then the acceleration will be determined by the single
force
/.numerical value of acceleration due to gravity - Answer-ft/s^2: g=32 ft/s^2
m/s^2: g=9.8 m/s^2
/.does g depend on the mass of the object? - Answer-no, it determines the force, not the
acceleration
/.does g depend on the motion of the object? - Answer-no, the motion of the object does
not effect the acceleration
*acceleration is not the same as velocity
*acceleration is constant and downward
