Chapter 4 - More About Force Flashcards
What opposes driving force?
Friction and air resistance
What does stopping distance depend on?
Thinking and braking distance
What factors increase braking distance?
Poor weather conditions, high speed and poor vehicle conditions
What factors increase thinking distance?
High speed, distractions and poor reaction time
Why would you need a greater braking force for a vehicle?
High mass
What is the weight of an opject?
The gravitational force acting on it
What is the mass of an object?
Quantity of matter in an object
How fast does an object accelerate if only acted on by gravity?
10m/s²
What is terminal velocity?
The velocity an object eventually reaches in a fluid
What is the weight of an object equal to at terminal velocity?
The frictional force
What is the frictional force in air?
Air resistance
When is an object considered elastic?
If it returns to its original shape after removing the deforming force acting on it
What is the extension equal to?
Difference between length at the stage - original length
State Hooke’s Law
The extension of a spring is directly proportional to the force applied to it as long as the limit of proportionality isn’t exceeded
