Chapter 10 Force And Motion Flashcards
Newtons second law
The accelerarion of an object is directly proporti al to the resultant force on an object and is inversely proportinal to to the mass of an object
What does force =
Force = mass x acceleration
What does mass =
Mass = force / acceleration
What does acceleration =
Accelerarion = force / mass
What is inertia
The tendency for an object to stay at rest or to continue in uniform motion(constant velocity)
Mass
Mass of object meausred in kg
What is weight and the formula
Weight of an object is the force of gravity acting on the object
Weight = mass x accelerarion due to gravity(g)
What is terminal velocity
The maximum velocity that an object can travel at in a fluid(liquid and or gas)
What is the stopping distance
The distance it takes for a vechile to stop is called the stopping distance
Braking distance
Distance taken to stop once the brakes are applied
Thinking distance
The distance travelled in between the driver realising he needs to brake or actually braking
How to calculate braking force
Acceleration = final v - initial v / 2 x displacement(s)
Momentum and the formula
A property of a moving object which depends on how much mass the object has and how fast it is moving
Momentum(p) = mass x velocity
How to find mass with momentum and velocity
Mass = momentum / velocity
How to find velocity with mass and momentum
Velocity = momentum(p) / mass
What is an elastic object
One which regains it shape when the force deforming it (squashing or stretching) are removed-when it is deformed the energy which caused it to deform is stored as the electric energy, which is released when the force is removed
Compression
When a force is exerted on an object it will be compressed
Tension
An object can be in tension when a force pulls on a object
What is proportionality
Corresponding in size or amount to something else
Hooks law and formula
The extension of a spring is proportinal to the force applied provided it’s limit of proportinailty is not exceeded
Force applied(N) = spring constant (k(n/m)) x extension changex(m)
What if a speing pass it’s limit of proportianitly
The material will start to behave in a non linear way and will no longer to start to deform and regain it’s shape
