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Final

PHY100H1 Study Guide - Final Guide: Electromagnet, Net Force, Electric Field


Department
Physics
Course Code
PHY100H1
Professor
Vatche Deyirmenjian
Study Guide
Final

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Part 1, Newton's Mechanics
1) If an objects position is changing, can we be certain that it has a non-zero velocity? Can we be certain that it has a
non-zero acceleration?
Proposed answer:
Yes, we can be certain that it has a non-zero velocity as distance traveled = average speed x traveling time (note: velocity
means speed and direction).
Yes, we can be certain that it has a non-zero acceleration as an object need some force to move it (force = mass x
acceleration) and to overcome the frictional force exerted on it from the surface it travelled.
Or
No, we cannot be certain that it has a non-zero acceleration. According to law of inertia, a body that is subject to no external
forces must maintain an unchanging velocity). An object can change it position by travelling on a frictionless surface
(acceleration = change in velocity /time to make the change). (no frictionless surfaces in real world)
2) Forces of 8N and 3N act on an object. What is the net force on the object if these two forces are in opposite
directions? Or in the same direction?
Proposed answer:
The net force is 8N - 3N = 5N if the two forces are in opposite directions.
The net force is 8N + 3N = 11N if the two forces are in same direction.
3) For what kinds of phenomena is Newtonian physics incorrect? Why did it take so long to discover these
exceptions?
Newtonian physics is incorrect for objects that are very small, very large or very fast. It is also incorrect for strong
gravitational forces such as those near a neutron star or black hole.
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