P2: Force and Acceleration Flashcards
Whenever two objects interact, the forces they exert on each other are what?
Equal and opposite
What is a resultant force?
The total number of forces acting on a body
What will happen to a stationary object if the resultant force is :
0?
Not 0?
It will remain stationary
It will accelerate in the direction of the resultant force.
What will happen to a moving object if the resultant force on it is:
0?
Not 0?
Will remain same speed and direction
Will accelerate in the direction of the resultant force
How do you work out the resultant force by using acceleration and mass?
Resultant force (N) = mass (Kg) x acceleration (m/s2)
When a vehicle travels at a steady speed, what do the frictional forces do?
Balance the driving force
What affects a vehicle’s top speed?
Shape and power
As the speed of a vehicle increases, what is needed by the breaking force?
There needs to be greater breaking force to stop the car in a certain distance
The stopping distance of a vehicle depends on what?
Distance the vehicle travels during the drivers reaction time and the distance it travels under the breaking force
Stopping distance = thinking distance + breaking distance
How can a driver’s reaction time be affected?
Tiredness
Drugs
Alcohol
Distractions
How can a vehicle’s breaking distance be affected?
Adverse road
Weather conditions
Poor condition of vehicle
The faster a body moves through a fluid…
…the greater the frictional force which acts on it
What is terminal velocity?
When the resultant force is 0
