P10 Forces And Motion key INFO Flashcards
What is the equation to find the resultant force of an object?(N)(on equation sheet so do not worry)
Mass (kg) x acceleration(m/s squared)
What is the letter equation for the reusltnat force of an object?
F= m x a
What is the equation for momentum of a moving object?(on equation sheet so don’t worry)
Mass(kg) x velocity(m/s)
What is momentum measured in?
Kg m/s)
Is momentum a vector quantity?
Yes because it has size and direction
What is Newton’s second law of motion?
The acceleration of an object is:
- proportional to the resultant force of an object
- inversely proportional to the mass of the object
What is the conservation of momentum?
In a closed system, the total momentum before an event= total momentum after the event.
What is the single letter equation for momuntum of a moving object?
P=m x v
What changes the velocity of an object?
The resultant force
What is interia?
The objects tendency to move at a constant speed or rest
Resultant force=0
What is mass and what is it measured in?
The amount of matter in an object, kg
What is weight and what is it measured in?
Force acting on an object from gravity, Newtons
What is the equation for weight?
Mass x gravitational feild strength
What is the stopping distance?
Distance covered when the vehincle is breaking (or the breaking force is upplied)until the object is stationary
Want is the thinking distance?
The distance covered in the time it takes to react,ends when the breaks are applied.
What is terminal velocity?
When the object reaches a constant velocity(velocity it reaches when its falling)
Frictional force is equal and opposite to the objects weight
(Resultant force=0)
What is crucial for the conservation of momentum to work?
No exernal forces act on the object.
If an object is elastic it____________
Returns to its original shape when the forces deforming it are removed.
What is hooke’s law equation?
Force applied= spring constant k x extention (e)
F= k x e
The stiffer the spring the…………
Stiffer the spring constant
What is the extention of the string directly proportional to?
The force applied to it
What does Hooke’s law state?
The extention of a spring is directly proportional to the force applied to it as long as its limiy of proportionality has not been exceeded.
What is the spring constant?
How stiff the spring is
The spring constant is equal to ………
Force per extention
If limit of proportionality has not been exceeded
What is the opposite of elastic?
Plastic?
