Forces And Motion Flashcards
What can force cause an object to do
Move
Accelerate
Change speed or direction
What is a force
A push of pull that acts on an object
What is force measured in
Newtons
What is used to represent the direction and strength of a force
Arrows
What is the overall force acting on an object after all the forces are combined
Net force
Balanced forces have a net force of ______.
Zero
What happens when an unbalanced force acts on an object
It accelerates or changes direction
Vocab
A force that opposes the motion of objects that touch as they move past each other
Friction
All moving objects are subject to __________.
Friction
What friction force acts on objects that are NOT moving
Static friction
What direction does static friction act in
In the direction opposite the applied force
Compare sliding and static friction
Sliding friction takes less force that static friction. Sliding friction also acts in the opposite direction of the push.
What friction is caused by the floor and object being slightly bent out of shape as an object rolls
Rolling friction
Why are ball bearings used in machinery
To lesson the friction in machines
What friction opposes the motion of an object through a fluid
Fluid friction
How does fluid friction increase
It increases as the speed of the object moving through the fluids increase
What is gravity
An attractive force that acts between any 2 masses
When is gravity stronger
Masses involved are bigger/closer together
Gravity causes falling objects to ________.
Accelerate downward
Air resistance reduces ________.
Acceleration
What is mass measured in
Kilograms
Does mass change in space?
No
Why would your weight change in space
Mass in space is different from mass on earth
What did Isaac Newton publish
Principia
What is the first law of motion also called
Law of inertia
What is inertia
Tendency of an object to resist change in motion
The more mass equals the more what
Inertia
Mass is the measurement of _________ in an object
Inertia
Second law of motion
Acceleration = net force divided by mass
How do u find force
Force = mass x acceleration
Acceleration always works in the same direction as __________.
Net force
SI unit for acceleration
Newtons per kilogram
Third law of motion
For every action there is an equal and opposite reaction
How do you find momentum
Mass times velocity
Units for momentum
Kilograms times meters per second
Okay what is a closed system
A system where other objects and forces cannot enter or leave a system
