PART 3 Flashcards
1
Q
A book rests on a table. The forces acting on the book are its weight (due to gravity), and the normal contact force due to contact with the table. Are these two forces an interaction pair? Explain your answer.
A
No, they are not an interaction pair because they are not the same type of force, and they both act on the same object (the book).
2
Q
How is the weight of an object calculated?
A
Weight = mass x gravitational field strength
3
Q
What is the magnitude of gravitational field strength (g) on Earth? State the unit.
A
g = 10N/kg
4
Q
Write down three factors that could increase human reaction time.
A
Drinking alcohol
Distraction
Being tired
5
Q
Write the equation for car stopping distance.
A
Stopping distance = thinking distance + braking distance
