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Ballistics cart
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The simulation shows a ballistics cart. If the cart is at rest ...

The simulation shows a ballistics cart. If the cart is at rest on a horizontal surface, it will shoot a ball straight up in the air, and catch the ball again. What if, as in this simulation, the cart is traveling at a constant velocity horizontally, instead? Will the ball land ahead of the cart, in the cart, or behind the cart? Note that the cart fires the ball straight up, with respect to the cart, when the middle of the cart passes the small vertical trigger on the track.
Use the buttons to select the different modes (whether there is a tunnel or not, and whether to show the velocity vectors).

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
Constant acceleration, same physics
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The simulation shows five different motions in which objects experience constant acceleration, ...

The simulation shows five different motions in which objects experience constant acceleration, starting from rest. Although each motion is different, the underlying physics is the same. What features of the simulation reinforce the idea that the physics is the same?

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
Elevator physics
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The simulation illustrates the situation of a person in an elevator. The ...

The simulation illustrates the situation of a person in an elevator. The elevator takes the person from one floor to the next floor up.
For this situation, try sketching three free-body diagrams, one for the person, another for the elevator, and a third for the person-elevator system.
First, draw the diagrams for when the system remains at rest. Then, predict whether the free-body diagrams will change (and, if so, how) when the elevator is accelerating up, moving up at constant velocity, and moving up but slowing down (acceleration is down).

The simulation draws the diagrams for all these cases, but make sure you try drawing your own before looking at the simulation's diagrams.

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
Galileo's ramp with sound
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The simulation beeps each time the ball passes one of the vertical ...

The simulation beeps each time the ball passes one of the vertical red lines. Just like the bells on Galileo's ramp, the positions of three of the vertical red lines can be adjusted. The first line and the last line are fixed in place, but the sliders allow you to adjust the positions of the second, third, and fourth lines. Move the lines around until the beeps occur at regular time intervals (make sure the sound is on, on your computer or mobile device).

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
The monkey and the hunter
Conditions of Use:
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The simulation shows the classic physics situation of a monkey and hunter. ...

The simulation shows the classic physics situation of a monkey and hunter.
In this case, the hunter is trying to tranquilize the monkey, so the monkey can be re-located to a better habitat. The monkey is clever - when the tranquilizer dart (in blue) leaves the gun, the monkey (in purple) lets go of the tree branch, and starts to fall straight down. Note that there is a net (not shown) at the bottom to catch the monkey, so the monkey won't get hurt.
How should the gun be aimed so the dart hits the monkey?

You can explore various parameters, including changing the direction the gun is aimed, changing the value of the acceleration due to gravity, and adjusting the dart's launch speed.

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
Relative velocity: race on a moving sidewalk
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This simulation involves relative velocity in one dimension. It is an out-and-back ...

This simulation involves relative velocity in one dimension. It is an out-and-back race between two women. Mia runs on the moving sidewalk, while Brandi runs on the non-moving floor. Under what conditions is the race a tie? Under what conditions does Mia win? Under what conditions does Brandi win?

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
Static friction
Conditions of Use:
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In this simulation, you see, on the left, a picture of a ...

In this simulation, you see, on the left, a picture of a box at rest on a table. You can apply a force to the box - note that you set the y-component and the x-component separately. On the right, you can see the full free-body diagram of the box. The free-body diagram shows the gravitational force exerted on the box by the Earth, the normal force exerted by the table, the force that you apply, and, if there is one, the static force of friction. Note that, on the free-body diagram, the force of gravity and the normal force have been shifted horizontally a little so they can be seen more easily. If there is a net force, that is also indicated.

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
Vector Addition
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The simulation shows two vectors and their sum, which we call the ...

The simulation shows two vectors and their sum, which we call the resultant vector. The x and y components of each of the vectors are also shown.

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
Vector-addition patterns
Conditions of Use:
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The simulation shows two vectors and their sum, which we call the ...

The simulation shows two vectors and their sum, which we call the resultant vector. The x and y components of each of the vectors are also shown.

هذه المحاكاة تتحدث عن الأنماط لجمع المتجهات.

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy
Whole vectors
Conditions of Use:
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The simulation shows different ways of looking at position and velocity vectors ...

The simulation shows different ways of looking at position and velocity vectors for a ball experiencing projectile motion.

تبين المحاكاة طرق مختلفة للنظر في الموقف وسرعة النقل لحركة المقذوفات

Subject:
Physics
Material Type:
Simulation
Provider:
Boston University
Author:
Andrew Duffy