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Browsing Animations: Forces

11 Animations


Animate

Gravity-Animation-Template.iwp

A blue object orbits a large, fixed mass at the origin. The power of the gravitational force on each of the orbiting objects can be adjusted according to a number of parameters: the mass of each object; the gravitational constant G. In reality, the gravitational force is exactly inversely proportional to the square of the distance between the orbiting object and the origin. This animation replicates this force, but we might also be interested in the behavior of gravity at different powers. Using the designer, edit this animation to allow the user to input a gravitational power which changes the behavior of gravity. In order to compare this generalized gravitational scheme to reality, include two oribiting objects, each with inputtable parameters.

Animate

fallcompare-simulation.iwp

The green ball falls in a vacuum, while the red ball experiences a drag force from the fluid in which it falls. The acceleration of the red ball is a = -g + kv**2, where g = 9.8 N/kg, v is the speed of the ball, and k is a coefficient (which we term the drag factor) that depends on characteristics of the ball and the fluid. You may change the value of k to see how that influences the red ball. The vertical separation of the two balls is displayed in the list of outputs.

Animate

hookeslaw03.iwp

A platform (black) is suspended from a fixed support by a rubber band. Weight can be added to the platform. When the red stick is pulled away, the platform with its weight will oscillate vertically and eventually come to rest at its equilibrium position. The goal of the problem is to take data to find the spring constant of the rubber band and to find the mass of the platform. For the latter, you'll need one measurement other than those described below. With platform held in place by the stick, the rubber band is unstretched. Click the play buttom to pull the stick away quickly and let the platform fall. After the platform reaches its resting position, read the position to the nearest 0.001 m. (In order to make the motion damp more quickly, increase the value of the damping coefficient.) Add 0.1 kg of mass to the plaform and click Reset. Then play the animation to see the new equilibrium position. Record the reading. Continue to add mass in increments of 0.1 kg and measure the equilibrium position each time. Tic marks are placed every 0.05 m to aid in taking readings.

Animate

incplane05.iwp

An object slides down an inclined plane. The coefficient of kinetic friction, which is initially 0, can be changed. The inclination of the plane, the initial x-coordinate of the block, and the initial velocity can also be changed. Vectors in black represent the fores acting on the plane. The vector in red is the net force. The scale factor may be changed to increase or decrease the size of all the vectors by the same factor.

Animate

nsl-00.iwp

Two blocks initially rest next to each other on a frictionless surface. (The view is looking down on the surface.) At t = 0, an identical push is applied directly to each block. The push on each block remains constant as the blocks accelerate. Which block has more mass and why.

Animate

nsl-01.iwp

Two blocks rest next to each other on a frictionless surface. At t = 0, a push (by a hand for example) is applied directly to the green block. The push remains constant as the two blocks accelerate.

Animate

nsl-02.iwp

Two blocks rest next to each other on a frictionless surface. At t = 0, a push (by a hand for example) is applied directly to the red block. The push remains constant as the two blocks accelerate.

Animate

planetary-system-02.iwp

Four moons revolve around a planet in circular orbits. Determine the period and radius of each orbit. Use the buttons on the right to start/stop the animation and step it frame-by-frame. Readouts of time and position coordinates are displayed above the buttons.

Animate

projectile-drag-2.iwp

The green projectile is subject to a v-squared drag force. The red projectile is subject to a v drag force.

Animate

projectile-drag-lift-2.iwp

The projectile is subject to a downward gravitational field, a drag force opposing the velocity and proportional to v-squared, and a lift force proportional to and perpendicular to the velocity.

Animate

turntable05.iwp

A penny on a turntable slides off when the turntable reaches a certain frequency. What is the coefficient of static friction of the turntable? How does the result depend on the radius of the path?