Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
42 Cards in this Set
- Front
- Back
|
Force |
A push or pull
|
|
|
Newtons |
The metric unit for force or weight. |
|
|
Net Force |
The combination of all forces acting on an object. |
|
|
Unbalanced |
__________ forces acting on an object result in an net force and a change in the object's velocity.` |
|
|
Speed up Slow down Change direction |
3 ways that an object's velocity can change. |
|
|
Direction |
A force has both magnitude and a ____________. |
|
|
Opposite |
Friction is a force that acts in the _______ to the motion of a moving object. |
|
|
Rub |
Friction exists whenever two surfaces _______ against each other. |
|
|
types push |
The strength of friction depends upon: the _____ of surfaces involved and on how hard the surfaces ______ together. |
|
|
static |
______ friction is the friction that acts on objects that are not moving. You must overcome this friction to get an object to start moving. |
|
|
slide |
______ friction occurs when an object slides across a surface. |
|
|
rolling |
______ friction is produced when using wheels or ball bearings. |
|
|
fluid |
______ friction occurs when an object moves across or through a fluid. |
|
|
less |
Rolling friction tends to be _______ than sliding friction. |
|
|
less |
Fluid friction is usually _______ than sliding friction. |
|
|
walking steering stopping |
Give an instance when friction is helpful. |
|
|
gravity |
A force that pulls objects towards each other is _______. |
|
|
mass of the objects distance between the objects |
The size of the force of gravity that one object exerts on another object depends on 2 factors. These factors are _______ & _______. |
|
|
increases |
The force of gravity increases as the masses of the objects _________. |
|
|
closer |
The force of gravity increases as the distance between the objects gets _________ . |
|
|
mass |
Weight = _______ x acceleration due to gravity. |
|
|
weight |
_______ us a measure of the force of gravity on an object. |
|
|
mass |
_______ is a measure of the amount of matter in an object. |
|
|
9.8 |
On Earth, the acceleration due to force of gravity is _______ meter/sec^2. |
|
|
free fall |
An object is in _______ _______ if only the force of gravity accelerates it in a downward direction. |
|
|
projectile |
A ________ is an object that is thrown. |
|
|
comparison |
_______ is an elastic force that squeezes or pushes matter together. |
|
|
tension |
______ is an elastic force that stretches or pulls matter. |
|
|
unbalanced forces
|
Netons first law of moition states that an object will remain at rest unless acted upon by an __________ ________
|
|
|
interia |
The tendency of an object to resist a change in motion. |
|
|
mass X acceleration |
force =_____________ |
|
|
greater |
The less mass an object has, the _________ its acceleration. |
|
|
opposite |
Newtons third law of motion states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the ________ direction. |
|
|
opposite |
for every action there is an equal and ________ reaction. |
|
|
momentum |
= mass + velocity |
|
|
velocity |
the more momentum an object has, the harder it is to change its _________. |
|
|
change |
The law of conservation of momentum states that in the absence of outside forces the total momentum of two objects that collide does not _______. |
|
|
centripetal |
_______ force is any force that causes an object to travel in a circular path. |
|
|
velocity m/sec |
v stands for _________ and its units are _________. |
|
|
acceleration due to gravity m/sec2 |
g stands for ___________ and its units are _________. |
|
|
distance m
|
d stands for ___________ and its units are ________. |
|
|
time sec |
t stands for___________ and its units are _____. |
