P10 Flashcards
How do you calculate resultant force?
Mass times Acceleratiom
What does Newton’s second law of motion state
That acceleration of a force is proportional to the resultant force on the object and inversely proportional to the mass of the object
What is inertial force
Force divided by acceleration
Why does the acceleration of an object decrease as it falls
Because the frictional force speeds up
When does the object reach terminal velocity?
When the frictional force on it is equal and opposite to his weight LOL the resultant force is zero
What does the braking force needed depend on
The speed of the vehicle when the brakes are first applied, and the mass of the vehicle
What is thinking distance?
The distance travelled by the vehicle in the time it takes for driver to react.
What is braking distance?
The distance travelled by the vehicle during the time the braking force acts.
Is momentum a vector quantity?
Yes
How to calculate momentum?
Mass times velocity
What does the law of conservation of momentum state
In a close system, the total momentum before an event is equal to the total momentum after the event
Why is the squash ball elastic
Because it goes back to its original shape
Elastically deformed or
Inelastically deformed
How do you know if an object is elastic?
If it returns to its original shape and the forces deforming it are removed.
How do you find extension?
Length that stage minus original length
