P3 - Falling safely Flashcards
1
Q
When is terminal speed reached?
A
When the forces are balanced.
2
Q
How is friction reduced?
A
- lubricating moving parts of machines
- streamlining cars
- shaping car roof boxes
- closing car windows when driving
3
Q
What does less energy waste mean for a car?
A
- fuel consumption is improved
- the cars top speed is increased
4
Q
What does the size of air resistance force on a falling object depend on?
A
- its cross sectional area
- its speed
5
Q
What is gravitational field strength measured in?
A
Newtons per kilogram (N/kg)
