Physics Unit 3 Test
Steps to find the coefficient of Kinetic Friction
1. Find Normal force by using Fg=ma, Fg=Fn 2. Use ∑F=ma to solve for Friction 3. Use Ff=µkFn to solve for µ
It is easier to slide an object down an inclined ramp than it is to slide across a level floor because there is a component of the ... force that is ... to the ramp , and pointing down the ramp
gravity, parallel
On an inclined ramp, the normal force is equal to the component of the ... force that is ... to the ramp.
gravity, perpendicular
Standard SI unit for Mass
kg (kilogram)
... friction occurs once two objects are sliding against each other, and it has a ... value equal to µkFn
kinetic, constant
Standard SI unit for Displacement
m (meter)
Standard SI unit for Distance
m (meter)
Standard SI unit for Velocity
m/s (meters/ second)
Standard SI unit for Acceleration
m/s² (meters/second²)
When air resistance is a factor, objects with greater ... fall faster. When air resistance is negligible, objects fall at the same rate with a constant acceleration equal to ...
mass, 9.8 m/s²
... is the property of an object that determines how much it will ... a change in its motion.
mass, resist
Newton's 2nd Law of Motion states that acceleration is proportional to the ... ... on an object and inversely proportional to the object's ...
net force, mass
Standard SI unit for Coefficient of friction
none
Air resistance is a force that... motion through air. Unlike kinetic friction, air resistance is not ... but ... as the speed of the object increases.
opposes, constant, increases
Friction is a force that ... sliding motion. Friction is always proportional to the ... force.
opposes, normal
Newton's 3rd Law of Motion states that forces come in ... that are equal in ... and opposite in ...
pairs, magnitude, direction
The normal force is always ... to the contact surface between two objects.
perpendicular
To find the net force, add all of the forces pointing in the ... direction and ... all of the forces pointing in the ... direction.
positive, subtract, negative
A force is a ... or ... on an object resulting from the object's ... with another object.
push, pull, interaction
Forces are ... so that both a magnitude and direction must be provided to understand the force.
vectors
Net force equation
∑F= ma
If the ramp makes an angle of θ to the horizontal, the normal force would equal ....
Fgcosθ
If the ramp makes an angle of θ to the horizontal, that force pointing down the ramp would equal...
Fgsinθ
Spring Constant equation
Fs= -kx
... Law states that the force exerted by a spring is proportional to both the ..., k, and how far the end of the spring is ... or ... from its ... point.
Hooke's, spring constant, stretched, compressed, equilibrium
... is the force of gravity on an object. Given an object's mass, the weight is equal to the mass multiplied by the ... due to gravity, which has a value of...
Mass, acceleration, -9.8 m/s²
Standard SI unit for Force
N (Newton)
Standard SI unit for Spring constant
N/m (Newton/ meter)
...velocity is the maximum speed of a falling object reaches when the drag force is equal to the ... force.
Terminal, gravity
Terminal velocity equation
Vt= √2mg/CpA
Weight equation
W=mg (g=acceleration, 9.8 m/s²)
A free body diagram shows only the ... forces acting on an object. All of these forces are drawn as arrows starting at the ... of the object and pointing in the direction of the force.
external, center
An object can move at a ... velocity even if there is no force on it.
constant
Two categories of forces include ... forces and ... forces
contact, action at a distance
The coefficient of friction is a ... value between ... and ...
dimensions, zero, one
The state of ... occurs when the net force on an object is zero. In equilibrium there is no ... or ...
equilibrium, net force, acceleration
Newton's 1st law of Motion has two scenarios. An object at ... may stay at ... unless there is a ... force on it. Also, an object at a certain ... may stay at that ... unless there is a ... force on it.
rest, rest, net, velocity, velocity, net
The equation for finding the spring force has a negative sign because the force of a spring is always a ... force, seeking to return the end of the spring back to its ... point.
restoring, equilibrium
Standard convention is that the positive horizontal direction is to the ... and the positive vertical direction is to the ...
right, top
The two most important factors that influence the amount of air resistance are the ... of the object and the ... area of the object.
speed, cross-sectional
... friction occurs before sliding has begun, and it has a ... value equal to µsFn.
static, maximum
The net force is the ... ... of all the forces acting on an object. When analyzing the motion of an object, we typically add only those forces in the .... of the motion.
vector sum, direction
