Two carts rest on similar air tracks. Each is given an identical push for 1 second. Which cart is more massive? Which of Newton's laws did you use to come to your conclusion?   Start

Interactive Hint

A 100 kg wagon  with a 10kg block on its a frictionless bed is pulled to the right with a constant force. Determine whether the animation above obeys Newton's laws. Support your answer.  Start

Interactive Hint Does this animation look more or less physical, why?

A 4500 kg truck  is used to stop a runaway 1500 kg car as shown in the animation (position is in meters and time is in seconds). What is the force of the truck on the car? Start

A 1.5 kg block receives a  push and in the process pushes against a 4.5 kg block as shown in animation 1: Start Animation 1 (position is in meters and time is in seconds). Conversely, in animation 2, the same 4.5 kg block receives the same push, now from the opposite direction and in the process pushes against the 1.5 kg block as shown: Start Animation 2 . Determine the force of the large block on the small block in both cases. Do you expect both forces to have the  same magnitude?

ratio of  masses: M / m=   Note: keep ratio above .4

A 10 kg mass is attatched via a pulley to another variable mass m. Test the limits of the formula for the acceleration of an Atwood's machine by changing the ratio of the masses above by stating which of the following are true:

1. when  M=m    =>  a=g
2. when  M=m    =>  a=0  
3. when  M>>m  =>  a=g  
4. when  M>>m  =>  a=0
5. when  M<m    =>  a=0
6. when  M<m    =>  a=g 
7. when  M<m    =>  a<0

Note that when M falls the acceleration is positive. Also  keep the ratio above .4.Start

A 5kg block is pulled to the right as shown in the animation. The block is connected via a massless string and a massless pulley to another block m=1kg that sits on top of the larger block. All surfaces are frictionless. Determine the force of the pull. Start

An elevator accelerates upward for one second, travels at constant velocity, and then decelerates one second prior to reaching its destination such that it comes to rest. If a 50 kg woman stands on a scale in the elevator, what will the scale read when t is between 0 and 1 second? Start

Interactive Hint

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An elevator travels upward at a constant speed for 5 seconds, and then suffers a catastrophic failure as depicted in the animation. If Nancy, a 50 kg woman, stands on a scale in the elevator, what will the scale read when t is between 0 and 5 seconds and when t > 5seconds?   Start

Two masses M=2.5kg and m (unknown) along with an ideal pulley form an Atwood's machine as shown in the animation. What is the mass of  m and the tension in the string? Start

A puck moving on an air hockey table at constant speed receives a momentary "push" in the +y direction at x=0 as shown in each of the animations below. Which animation correctly shows the motion of the puck after it is pushed?
Start animation 1

Start animation 2

Start animation 3

Start animation 4

A satellite floats at constant speed when, at t=2, its thrusters are suddenly engaged producing a constant force perpendicular to its original motion. Which animation correctly depicts the satellite's motion after the thrusters are first engaged.
Start animation 1

Start animation 2

Start animation 3

Start animation 4

Interactive Hint: Green arrow represents the y-velocity and the blue arrow represents the x-velocity.