P10 Forces And Motion Flashcards
Inertial mass
The measure of difficulty in changing an object in uniform motion
Newton’s second law
The acceleration of an object is directly proportional to the resultant force of an object
Terminal velocity
The maximum velocity that an object can travel at in a fluid
Thinking distance
The distance travelled in between the driver realising he needs to brake and actually braking
Braking distance
The distance taken to stop once the brakes are applied
Momentum
A property of a moving object depends on how much mass the object has and it’s speed
1 factor that affects braking distance
Size of vehicle
Hooke’s law
The extension of a spring is directly proportional to the force applied provided its limit of proportianlity is not exceeded
What happens if spring pass its limit of proportionality
The material starts to behave in a non-linear way
Independant variable
The variable that changes
Controlled variable
The variable that stays the same during the experiment
Dependent variable
The variable that is measured
How to change momentum
A force must be applied
What does magnitude of force depend on
The size of the change in momentum
Compressed
When a force is exerted on an object
Tension
When a force pulls on the object
Gravitational field strength
The gravitational force on an object where the object is
What is the resultant force for a car travelling at a constant velocity
0
Stopping distance
The shortest distance a vehicle can safely stop in
What happens to momentum when 2 objects collide
It changes
Conservation momentum
Within some problem domain the amount of momentum remains constant
Newton’s first law
An object at rest remains at rest, and an object in motion remains in motion at constant speed
