Forces Flashcards
What is resultant force?
A single force that has the same effect as two or more force is acting on it
What happens when an object is at terminal velocity?
The object stays at a steady speed in a constant direction due to the resultant force acting on it being zero
What does Newton first law of motion say?
An object remains in the same state of motion unless a resultant force acts on it
What is inertia
Tendency of an object to continue in its current state
Newton’s second law of motion
Resultant force = Mass x acceleration
What does Newton’s second law show that the acceleration of an object is
Proportional to the resultant force on the object and inversely proportional to the mass of the object
What is the ratio of force over acceleration called
Inertial mass
What happens to acceleration of an object if the resultant force on it increases
It increases
What happens to the acceleration of the mass of the object increases
It decreases
What is Newton’s third law ?
When two objects interact they exert equal and opposite forces on each other
Equation for stopping distance
Thinking distance + braking distance
What is thinking distance?
The distance vehicle travels in the time it takes for the driver to apply the brakes after realising he needs to stop
What is braking distance
Distance vehicle travels in the time after the driver has applied the brakes
What can a drivers reaction time be affected by?
Tiredness, drugs, alcohol, and distractions
What is the breaking distance of a vehicle affected by?
Poor weather and road conditions and poor vehicle conditions
Contact force examples
Tension, air resistance, friction and normal reaction force
Non contact forces
Gravitational, magnetic and electrostatic
