Forces, accelerations and Newton's Laws of motion Flashcards
(28 cards)
Define stopping distance
The distance it takes to stop after the brakes are applied
Stopping distance equation
Thinking distance + braking distance
Define Thinking distance
The distance travelled by the vehicle in the time it takes the driver to react
Define Braking distance
The distance your car travels after you apply the breaks
What is terminal velocity
The greatest velocity a falling object reaches
What are the 3 stages as an object falls through a fluid
- Object accelerates down due to gravity
- Objects speed increases from air resistance
- At terminal velocity the weight of an object is balanced with friction so the resultant force is zero
What does the terminal velocity look like on a graph
A straight line
What does terminal velocity depend on?
Size shape and mass of the falling object
What is Newtons first law
An object remains in the same state of motion unless a resultant force acts on it-inertia
What happens if the resultant force is zero on an object
It will be stationary, or an object will remain at the same velocity
What is inertia?
The tendency of an object to resist a change in motion
What is an example of newtons first law
An object falling at terminal velocity experiences the same air resistance as its weight
What happens if the forces on an object are balanced
The resultant force is zero
What does newtons first law explain?
Motion of travelling objects
What is Newtons second law?
Force = Mass x acceleration
What is the relationship between the resultant force of an object and the acceleration
Directly proportional
What is inertial mass
How difficult it is to change the velocity of an object
What happens to the acceleration if the resultant force decreases
It decreases
Define ‘Net Force’
A combination of all forces
Define ‘Unbalanced force’
A force that causes a change in movement
Define ‘Balanced Force’
A force that will not cause movement
Define ‘Friction’
Forces that two surfaces exert on each other
Define ‘Static Friction’
Friction that acts on non-moving objects
Define ‘Gravity’
A force that pulls objects toward each other
