1D Motion

The closeness of a measurement to its true value is a measure of its:

• precision
• accuracy
• reproducibility
• usefulness

Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of exactly 7.32 g for the mass of the standard. These results imply that the balance that was used is:

• accurate but not precise
• precise but not accurate
• both accurate and precise
• neither accurate nor precise

A scalar is a quantity that is fully described by ____

• magnitude alone
• both its magnitude and its direction
• both its displacement and its velocity
• both its distance and its speed

For any given motion, the distance is ____.

• the direction which an object moves
• the scalar of the object's velocity
• how far out of place which the object finishes relative to the starting location.
• the amount of ground which is covered by the moving object.

A vector is a quantity that is fully described by ____.

• both its magnitude and its direction
• magnitude alone
• both its distance and its speed
• both its displacement and its velocity

For any given motion, displacement is ____.

• the direction which an object moves.
• the magnitude which the object moves.
• how far out of place which the object finishes relative to the starting location.
• the amount of ground which is covered by the moving object.

A teacher does the following motion in 10 seconds: (i) walks 2 m, south (ii) walks 4 m, east (iii) walks 2 m, north (iv) walks 4 m, west. The average speed of the teacher is ____.

• 0.0 m/s
• 0.83 m/s
• 1.2 m/s
• An average speed cannot be determined since individual speed values are not given.

The motions of five objects - A, B, C, D, and E - are represented by lines on a position-time graph. Write the letter for the object that has the greatest constant velocity.

• B
• C
• D
• E

A teacher does the following motion in 10 seconds: (i) walks 4 m, south (ii) walks 8 m, east (iii) walks 4 m, north (iv) walks 8 m, west. The average velocity of the teacher is ____.

• 0.0 m/s
• 0.6 m/s
• 1.2 m/s
• 2.4 m/s

An old car has a leaky engine and leaves the following oil drop trace on the street; the drops hit the street at regular time intervals. The oil drop pattern depicts

• a constant velocity
• an accelerated motion
• ... it's impossible to tell without any distance-time data.