Question Guide – Forces
Question:
A block of wood of mass 2.0 kg is resting on a rough, horizontal surface as shown. If F and f represents the applied force and friction respectively, find the value of F and f in order to produce an acceleration of 2.0 m/s(square).
| F | f | |
|---|---|---|
| A | 10 | 6 |
| B | 6 | 10 |
| C | 10 | 8 |
| D | 10 | 9 |
Guide
What is the Physics concept that relates forces with acceleration?
Resultant Force = Mass x Acceleration
Applying Resultant Force = mass x acceleration
= 2 kg x 2.0 ms-2
= 4.0 N
What is the Physics concept that relates actual forces with resultant force?
Resultant Force is the vector sum of all actual forces
Resultant = F – f
4N = F – f
Answer:
A. F = 10 and f = 6
This question is related to the topic “Forces” in Physics tuition for O Level.
Forces is part of the chapter “Dynamics” within the theme “Newtonian Mechanics” in Sec 3 Physics tuition.