6. Intro to Forces (Dynamics)

Vertical Forces & Acceleration

non equilibrium forces

Three sleds are being pulled horizontally on frictionless horizontal ice using horizontal ropes <img src="https://lightcat-files.s3.amazonaws.com/problem_images/58a812477981cc67-1673465638266.jpg" alt="" />(Fig. E5.14). The pull is of magnitude 190 N. Find (a) the acceleration of the system<img class="fr-dib" src="https://lightcat-files.s3.amazonaws.com/problem_images/4429ef7b28d13d47-1678205671242.jpg" style="width: 367px;">

A light rope is attached to a block with mass 4.00 kg that rests on a frictionless, horizontal surface. The horizontal rope passes over a frictionless, massless pulley, and a block with mass m is suspended from the other end. When the blocks are released, the tension in the rope is 15.0 N. (b) What is the acceleration of either block?

Two 25.0-N weights are suspended at opposite ends of a rope that passes over a light, frictionless pulley. The pulley is attached to a chain from the ceiling. (b) What is the tension in the chain?

What's Your Weight in an Elevator? | Physics with Professor Matt Anderson | M5-10

Anderson Video - Weight in an Elevator

At the surface of Jupiter’s moon Io, the acceleration due to gravity is g = 1.81 m/s2. A watermelon weighs 44.0 N at the surface of the earth. (a) What is the watermelon’s mass on the earth’s surface?

Elevator Problems Part 1 Free Body Diagram Physics Lesson

Two 25.0-N weights are suspended at opposite ends of a rope that passes over a light, frictionless pulley. The pulley is attached to a chain from the ceiling. (a) What is the tension in the rope?

Fernanda is standing on a scale while riding an elevator. If the scale reads <math display="inline"><mrow><mn>720</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">N</mi></mrow></math> while the elevator is accelerating upwards at <math display="inline"><mrow><mn>0.90</mn><mo rspace="thickmathspace">&#x2062;</mo><mrow><mi mathvariant="normal" class="MathML-Unit">m</mi><mo>/</mo><msup><mi mathvariant="normal" class="MathML-Unit">s</mi><mn>2</mn></msup></mrow></mrow></math>, what is Fernanda's mass?

Anderson Video - The Forces from Jumping

A 3-kg bucket is being pulled upwards by a cord. The tension in the cord is 35 N. What is the acceleration of the bucket? (The mass of the cord is negligible, which means you can assume m_cord = 0.)

The Mars Rover Perseverance weighed about 10,000 N while on Earth. After it reached the surface of Mars, it weighed about 3790 N. What is the gravitational acceleration on Mars?

Anderson Video - Rocket Launch

Lowering a Load of Bricks

A <math display="inline"><mrow><mn>500</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">g</mi></mrow></math> ball is dropped from a tall building. At one instant the force of drag on the ball was <math display="inline"><mrow><mn>3.0</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">N</mi></mrow></math>. What was the magnitude of the ball's acceleration at that instant?

Weight in an Elevator | Physics with Professor Matt Anderson | M6-15

You walk into an elevator, step onto a scale, and push the “up” button. You recall that your normal weight is 625 N. Draw a free-body diagram. (b) If you hold a 3.85-kg package by a light vertical string, what will be the tension in this string when the elevator accelerates as in part (a)?

Three sleds are being pulled horizontally on frictionless horizontal ice using horizontal ropes (Fig. E5.14). The pull is of magnitude 190 N. Find (b) the tension in ropes A and B.<img src="https://lightcat-files.s3.amazonaws.com/problem_images/836f2ddf4dcfb927-1670614170932.jpg" alt="" />

At the surface of Jupiter’s moon Io, the acceleration due to gravity is g = 1.81 m/s2. A watermelon weighs 44.0 N at the surface of the earth. (b) What would be its mass and weight on the surface of Io?

An astronaut’s pack weighs 17.5 N when she is on the earth but only 3.24 N when she is at the surface of a moon. (a) What is the acceleration due to gravity on this moon?

A 550-N physics student stands on a bathroom scale in an elevator that is supported by a cable. The combined mass of student plus elevator is 850 kg. As the elevator starts moving, the scale reads 450 N. (a) Find the acceleration of the elevator (magnitude and direction).

Vertical Forces And Acceleration in the Y-axis

A light rope is attached to a block with mass 4.00 kg that rests on a frictionless, horizontal surface. The horizontal rope passes over a frictionless, massless pulley, and a block with mass m is suspended from the other end. When the blocks are released, the tension in the rope is 15.0 N. (d) How does the tension compare to the weight of the hanging block?

Weight Force & Gravitational Acceleration

Newton's 2nd Law (6a of 21) The Normal Force, The Elevator

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1. Intro to Physics Units

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14. Torque & Rotational Dynamics

15. Rotational Equilibrium

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30. Induction and Inductance

31. Alternating Current

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33. Geometric Optics

34. Wave Optics

36. Special Relativity

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Newton's Third Law & Action-Reaction Pairs

Forces in 2D

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Vertical Equilibrium & The Normal Force

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