Forces, Movement, Shape Flashcards
What is a force and what can it do
It is a push or a pull
It can cause an object to speed up or slow down, change direction, change shape
What is force measured in and using what
Force is measured in Newtons(N) using a newton metre
What does an elastic material do when a force acts on it and what type of energy does it store
It deforms without breaking
It returns to original shape when force is removed
It can store elastic energy
What is Hooke’s law
The extension of a spring is proportional to the force applied to it
What happens when something is stretched over its elastic limit
The material is permanently deformed and will not return to its original shape once load is removed
Does a rubber band obey Hooke’s law?
No
What is Newton’s first law
Object stays at rest or moves in constant velocity unless acted upon by an unbalanced force
What is Newton’s second law
The acceleration of an object is proportional to its force and inversely proportional to its mass
What is the equation for Acceleration
Acceleration=Force/Mass
What is stopping distance, thinking distance, braking distance.
What is the equation linking them
Stopping distance is total distance required to stop a car
Thinking distance is the distance that car travels between the driver seeing the danger and applying the brakes
Braking distance is the distance that the car travels after the brakes have been applied
Stopping distance= Thinking distance+ Braking distance
What are some factors that affect stopping stopping distance, be specific to braking and thinking distance
Thinking distance: Tiredness, alcohol, drugs, visibility, distraction, age
Braking distance: Road conditions, Weather, Tire condition, speed, mass of car
What is mass and what is it measure in?
Mass is the amount of matter in an object, and it is measured in kilograms
What is weight and what is it measured in?
What is its equation
Weight is the force of gravity in a object, and it is measured in Newtons
Weight= Mass* Gravitational field strength (10 N/Kg)
What is free fall?
When an object falls freely to earth due to its weight at an acceleration of g=10 N/Kg
When does Air resistance increase?
When Velocity and Surface area increase
