6. Intro to Forces (Dynamics)

Forces in 2D

Forces on Boxes at Angles Part 1 Physics Lesson

A man pushes on a piano with mass 180 kg; it slides at constant velocity down a ramp that is inclined at 19.0° above the horizontal floor. Neglect any friction acting on the piano. Calculate the magnitude of the force applied by the man if he pushes (b) parallel to the floor.

A curve on an unbanked highway has a radius of 300 m. What minimum coefficient of static friction is required for a car to make the corner at <math display="inline"><mrow><mn>29</mn><mo rspace="thickmathspace">&#x2062;</mo><mrow><mi mathvariant="normal" class="MathML-Unit">m</mi><mo>/</mo><mi mathvariant="normal" class="MathML-Unit">s</mi></mrow></mrow></math> (about <math display="inline"><mrow><mn>65</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">mph</mi></mrow></math>).

Free Body Diagram Sine and Cosine Components | Physics with Professor Matt Anderson | M6-03

Newton's 2nd Law (4 of 21) Calculate Acceleration with Friction, Net Force Above the Horizontal

Forces on Boxes at Angles Part 4 Physics Lesson

A <math display="inline"><mrow><mn>500</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">kg</mi></mrow></math> car is parked on a hill with a 5° slope. What is the magnitude of the friction force acting on the car?

Forces on Boxes at Angles Part 3 Physics Lesson

2D Forces in Horizontal Plane

You push a 5.1kg cart along the floor with an unknown force F at 30° below the horizontal. Using a scale, you know the Normal force is 70N. What is the horizontal acceleration of the cart?

Solving an Unknown 2D Force

A man pushes on a piano with mass 180 kg; it slides at constant velocity down a ramp that is inclined at 19.0° above the horizontal floor. Neglect any friction acting on the piano. Calculate the magnitude of the force applied by the man if he pushes (a) parallel to the incline

1.5 m/s2, 14° ccw from +x-axis

1.5 m/s2, 76° ccw from +x-axis

6.9 m/s2, 1.1° cw from +x-axis

1.5 m/s2, 0.46° cw from +x-axis

Three horizontal forces act on a box (mass = 8 kg) sitting on a smooth surface. F1 is 30 N acting at 53° counterclockwise from the +x axis, F2 is 13 N acting at 67.4° clockwise from the +x axis, and F3 is 20 N directly along the -x axis. What are the magnitude and direction of the box's acceleration?

2D Forces in Horizontal and Vertical Planes

A race track has turns of radius <math display="inline"><mrow><mn>400</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">m</mi></mrow></math> that are banked at 30° above the horizontal. What is the fastest a car could go around this corner with no assistance from friction?

Wind Force on a Dropped Box

A particle is acted upon by 3 forces: a <math display="inline"><mrow><mn>10</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">N</mi></mrow></math> force in the positive x direction, a <math display="inline"><mrow><mn>20</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">N</mi></mrow></math> force in the positive y direction, and an unknown force. If the particle is in equilibrium, what is the magnitude of the unknown force?

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1. Intro to Physics Units

2. 1D Motion / Kinematics

3. Vectors

4. 2D Kinematics

5. Projectile Motion

7. Friction, Inclines, Systems

8. Centripetal Forces & Gravitation

9. Work & Energy

10. Conservation of Energy

11. Momentum & Impulse

12. Rotational Kinematics

13. Rotational Inertia & Energy

14. Torque & Rotational Dynamics

15. Rotational Equilibrium

16. Angular Momentum

17. Periodic Motion

18. Waves & Sound

19. Fluid Mechanics

20. Heat and Temperature

21. Kinetic Theory of Ideal Gases

22. The First Law of Thermodynamics

23. The Second Law of Thermodynamics

24. Electric Force & Field; Gauss' Law

25. Electric Potential

26. Capacitors & Dielectrics

27. Resistors & DC Circuits

28. Magnetic Fields and Forces

29. Sources of Magnetic Field

30. Induction and Inductance

31. Alternating Current

32. Electromagnetic Waves

33. Geometric Optics

34. Wave Optics

36. Special Relativity

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