Netwons First and Second Law Flashcards
What is a force needed to do
To change motion
What is Newton’s first law
The resultant force is needed to make something start moving, speed up or slow down
What happens when the resultant force is stationary
The object is zero, and the object will remain stationary.
What happens when the resultant force on a moving force is zero
It will continue to carry on moving at the same velocity ( same speed and direction )
When anything which moves at a constant velocity, what is the resistive force
The resistive and driving force must all be balanced
What will happen to the velocity when the forces are balanced
The velocity will only change is there is a non-zero resultant force acting on the object
What will, the non zero resultant force always do
It will produce acceleration ( or deceleration ) in the direction of the force
What can acceleration change different forms
Starting, stopping, speeding up, slowing down and changing direction
What is acceleration
It is the proportional to the resultant force
What happens when the large tier the resultant force acting on an object
The more the object accelerates - the force and the acceleration are directly proportional
What is the acceleration is
Also inversely proportional to the mass of the object
What happens when a object with a larger mass
Will accelerated less than the one with a smaller mass ( for a fixed resultant force )
What happens when the deceleration is large
It can be dangerous
What happens when objects have large decelerations of objects and people
e.g. car crashes can cause serious injuries. This is because the larger the deceleration requires a large force
How can the force be lowered for deceleration
It can be changed by slowing the object down over a longer time I.e decreasing it deceleration
