Title: Pre-Unit Assessment
Course: MNPCC Physics > Section: Newton's First Law

This first assessment will not be used towards you course grade.  It is only used for the purposes of seeing where you are at as you begin.

Q: Which of the following free body diagrams would be for a chair that is motionless on the floor?
A: (a choice with no text)
If right: Correct
If wrong: An object that is motionless must have balanced forces.
If wrong: An object that is motionless must have balanced forces.
If wrong: While this object would not accelerate, a real chair on a real floor must have two forces acting on it, the normal force and that of gravity.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which of the following free body diagrams would be for a weight that is being lifted upwards at a constant speed?
A: (a choice with no text)
If right: Correct
If wrong: An object that is moving at constant speed must have balanced forces.
If wrong: An object that is moving at constant speed must have balanced forces.
If wrong: While this object would not accelerate, a real chair on a real floor must have two forces acting on it, the normal force and that of gravity.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which of the following correctly shows a free body diagram for a car moving to the right at a constant speed?
A: (a choice with no text)
If right: Correct.
If wrong: An object that is moving at constant speed must have balanced forces.
If wrong: An object that is moving at constant speed must have balanced forces.
If wrong: An object that is moving at constant speed must have balanced forces.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which of the following graphs would best represent an object traveling at a constant speed SLOWLY TOWARDS the reference point?
A: (a choice with no text)
If right: Correct
If wrong: While Slowly is a relative term, this graph would show a much faster motion than the other.
If wrong: This is away from the reference point, not towards.
If wrong: This is away from the reference point, not towards, also not slow.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: The tendency of an object to resist a change in motion (inertia) is dependent on its:
- Mass only. (Correct)
- Velocity only (As velocity is relative to a reference point, your inertia is not, otherwise getting off the couch at the equator would be MUCH harder than at the North Pole!)
- Mass and Velocity. (As velocity is relative to a reference point, your inertia is not, otherwise getting off the couch at the equator would be MUCH harder than at the North Pole!)
- Neither of these. (The more massive an object is, the harder it is to move.)
A: Mass only.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: What is the difference between speed and velocity?
- Speed has only a magnitude, velocity also has a direction. (Correct)
- Speed is how fast an object is moving, velocity is the rate an object is moving. (Both “how fast” and “rate” mean the same thing.)
- Speed is a less formal term, velocity is the physics jargon. (Both are words that physicist use, but both words need to exist as they mean something different.)
- Speed can be directly measured, velocity must be calculated. (Both can be directly measured.)
A: Speed has only a magnitude, velocity also has a direction.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: A track athlete runs the 100 m dash in 10 seconds. What is their speed?
- 10 m/s (Correct)
- 0.1 m/s (You divided backwards)
- 1000 m/s (You multiplied when you should have divided.)
- 110 m/s (There is no adding when relating these three variables.)
A: 10 m/s
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: A car is moving at 30. m/s for 5.0 seconds. How far has it traveled in that time?
- 150 m (Correct)
- 6.0 m (You divided when you should have multiplied.)
- 0.17 m (You divided when you should have multiplied.)
- 25 m (There is no adding when relating these three variables.)
A: 150 m
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: A boat is sails 45 m while traveling at 15 m/s. How much time has elapsed?
- 3.0 s (Correct)
- 0.33 s (You divided the wrong way.)
- 675 s (You multiplied when you should have divided.)
- 60 s (There is no adding when relating these three variables.)
A: 3.0 s
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which of the following graphs shows an object that is moving at 5 m/s?
A: (a choice with no text)
If right: Correct
If wrong: This graph shows an object that is stopped 10 m away from the reference point for 2 seconds.
If wrong: This graph shows an object that is moving at 2.5 m/s
If wrong: This graph shows an object that is STOPPED at 5 m away from the reference point for 2 seconds.
If right: Your answer is correct.
If wrong: Your answer is incorrect.