Table of contents

0. Math Review31m
- Math Review
  31m
1. Intro to Physics Units1h 29m
2. 1D Motion / Kinematics3h 56m
3. Vectors2h 43m
4. 2D Kinematics1h 42m
5. Projectile Motion3h 6m
6. Intro to Forces (Dynamics)3h 22m
7. Friction, Inclines, Systems2h 44m
8. Centripetal Forces & Gravitation7h 26m
9. Work & Energy1h 59m
10. Conservation of Energy2h 54m
11. Momentum & Impulse3h 40m
12. Rotational Kinematics2h 59m
13. Rotational Inertia & Energy7h 4m
14. Torque & Rotational Dynamics2h 5m
15. Rotational Equilibrium3h 39m
16. Angular Momentum3h 6m
17. Periodic Motion2h 9m
18. Waves & Sound3h 40m
19. Fluid Mechanics4h 27m
20. Heat and Temperature3h 7m
21. Kinetic Theory of Ideal Gases1h 50m
22. The First Law of Thermodynamics1h 26m
23. The Second Law of Thermodynamics3h 11m
24. Electric Force & Field; Gauss' Law3h 42m
25. Electric Potential1h 51m
26. Capacitors & Dielectrics2h 2m
27. Resistors & DC Circuits3h 8m
28. Magnetic Fields and Forces2h 23m
29. Sources of Magnetic Field2h 30m
30. Induction and Inductance3h 38m
31. Alternating Current2h 37m
32. Electromagnetic Waves2h 14m
33. Geometric Optics2h 57m
34. Wave Optics1h 15m
35. Special Relativity2h 10m

6. Intro to Forces (Dynamics)

Newton's First & Second Laws

Physics

6. Intro to Forces (Dynamics)

Newton's First & Second Laws

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Multiple Choice

A $10 N$ horizontal force is applied to a $10 kg$ box causing it to speed up. The force of kinetic friction is $5 N$ . Which choice best describes the subsequent motion of the box?

The box will accelerate for a time, eventually reaching a large constant speed.

The box will eventually come to rest.

The box will move at a constant speed.

The box will continue to accelerate.

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Verified step by step guidance

Identify the forces acting on the box: a 10 N applied force and a 5 N force of kinetic friction opposing the motion.

Calculate the net force acting on the box using the formula: $ F_{\text{net}} = F_{\text{applied}} - F_{\text{friction}} $. Substitute the given values to find the net force.

Use Newton's second law of motion, $ F = ma $, to find the acceleration of the box. Rearrange the formula to solve for acceleration: $ a = \frac{F_{\text{net}}}{m} $. Substitute the net force and the mass of the box into the equation.

Analyze the result: Since the net force is positive, the box will experience a positive acceleration, meaning it will continue to speed up as long as the forces remain constant.

Conclude that the correct description of the box's motion is that it will continue to accelerate, as there is a net force causing a continuous increase in speed.