Whether the energy is constant or not? You push a box up a ramp. Call the initia

Question

Whether the energy is constant or not?

You push a box up a ramp. Call the initial time when you begin to push the box. Call the final time after you have pushed the box up the ramp a distance of 0.5 m and it is moving with a speed of 2 m/s
System: box + ramp + Earth
System: box + ramp
System: box + ramp + Earth + you
System: box
System: you

Two cars are driving down the road. They notice that they are going to crash, so both drivers slam on the brakes. The cars skid, but still collide. The cars stick together and eventually slide to a stop. Call the initial time just before the drivers apply the brakes and the final time just after the collision had occured.
System: the second car
System: both cars + the ground
System: both cars
System: the first car

Explanation / Answer

System: box + ramp + Earth not constant
System: box + ramp not constant
System: box + ramp + Earth + you = energy Constant
System: box not constant
System: you energy lost


System: the second car no
System: both cars + the ground = energyconstant
System: both cars no
System: the first car no

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