A measured value of 35m is being multiplied by the countable number 3 (say you went 3 times around a track that was 35m long). What's the correct number of sigfigs in the answer?
Method 1:
35 m x 3 = 105m = 110m
By significant digits rules of multiplication, this would be 110m. (The 35m...
This is how I'm seeing it, so help me out with my problem. The force diagram for my object would have two force vectors (ignore gravity and normal because they are perpendicular to displacement). The force of the push, acting to the right, and the force of friction, acting to the left. The...
Isn't there work done on the object by the push as well as by the friction? If you want to consider all the forces as one net force, then the net force would be zero, making the net work zero.
Right. The gained energy due to the work of the push is negated by the lost energy due to the work of the ground via friction. Both forces are equal, both displacements are equal. Yet there is still a gain in thermal energy. Unless you are suggesting that the work done by the push is greater...
If the object has increased in temperature due to friction, hasn't it gained thermal energy?
If Kinetic energy stays constant, potential energy stays constant, and thermal energy increases, isn't that a total gain in energy for the system?
Constant velocity problem, where does increase in energy come from?
Let's say that an object is being pushed with a constant force across a surface, and it is moving with a constant velocity. We can use Newton's second law to show that the force of friction is equal to the force of the push...