Physics 2a Flashcards
What is a resultant force?
The overall effect of all forces acting on an object
If the resultant force on a stationary object is 0, what will happen?
It will remain stationary
If the resultant force on a moving object is 0, what will happen?
It will carry on moving at the same velocity
What happens if there is a non-zero resultant force?
The object will accelerate in the direction of the force
Formula for acceleration?
Acceleration = force / mass
Force = mass * acceleration
What is the rule for when two objects interact?
The forces that they exert on each other are equal and opposite
What direction does friction act in?
The opposite direction to the movement
What happens to the frictional forces when the speed increases?
They always increase
What is the stopping distance made up of?
Thinking distance
Braking distance
What is the thinking distance?
The distance the vehicle travels during the drivers reaction time
What is the braking distance?
The distance the car travels under the breaking force
What two factors affect the thinking distance?
How fast you’re going
How dopey you are - tiredness, drugs and alcohol etc
What four factors affect the braking distance?
How fast you’re going
Condition of brakes
Condition of tyres - tread depth
How good the grip is - road surface, weather, tyres
What is the formula for Work Done?
Work Done = force * distance
What is the formula for gravitational potential energy?
Gravitational potential energy = mass * gravitational field strength * height
