A car that increases its speed from 20 km/h to 100 km/h undergoes ____________________ acceleration.

1. A car that increases its speed from 20 km/h to 100 km/h undergoes ____________________ acceleration.

2. It usually takes more force to start an object sliding than it does to keep an object sliding because static friction is usually ____________________ than sliding friction.

3. As an object's temperature increases, the ____________________ at which it radiates energy increases.

4. Using a hammer to drive a nail, it is the reaction force that brings the motion of the hammer to a stop but the _______________ that drives the nail into the wood.

5. The region where a magnet's force is strongest is at the_________________________.

6. When a person plucks a guitar string, the number of half wavelengths that fit into the length of the string determines the ____________________ of the sound produced.

7. The energy source used to produce most of the electrical energy in the United States is ____________________.

8. The magnetic field lines of a bar magnet begin near the magnet's ____________________.

9. In a closed system, the loss of momentum of one object ____________________ the gain in momentum of another object.

10. The law of reflection states that the angle of reflection is equal to the angle of ____________________.

11. How much time will it take a car travelling at 88 km/hr (55 mi/hr) to travel 500km? Show work for credit and include final units.

12. During a race, a runner runs at a speed of 6 m/s. 2 seconds later, she is running at a speed of 10 m/s. What is the runner's acceleration? Show your work.

13. Look at the graph below measuring the speed of a truck and answer the following 2 questions: 

a) If the graph represents speed, what is measured on the x and y axes? You need to specifically identify which axis is which.

b) Based on what the y axis measures, explain the motion of the truck represented by the graph from point 2 to 6.