Directions: Find the mistakes and omissions in the statements below. Rewrite each statement correctly on the lines provided.
6. You can tell an object has moved because its velocity has changed.

7. Displacement is how far an object moves.

8. Average speed is indicated on the speedometer.

9. A vertical line on a distance-time graph indicates that an object is stationary.

10. Speed is calculated by multiplying the time of travel by the distance traveled.

A race car driving around a track at 240 km/h has a constant velocity.

Motion 23

The amount of potential energy possessed by an elevated object is equal to what?

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.