Unit Test 1 Prep: Part 1

Front

The difference between speed and velocity is that speed is a scalar quantity, while velocity is a __________ quantity.

Back

Vector

Front

Which of the following is true about acceleration? 

A. It is the rate of change of displacement. 

B. It is always positive. 

C. It occurs when there is a change in speed, direction, or both. 

D. It is the same as velocity.

Back

C. It occurs when there is a change in speed, direction, or both.

Front

The total length of the path traveled by an object, regardless of its direction.

Back

Distance

Front

Which of the following statements are true about displacement? (Select all that apply.) 

A. Displacement is a vector quantity. 

B. Displacement measures the straight-line distance from start to finish. 

C. Displacement is always greater than or equal to the distance traveled. 

D. Displacement includes both magnitude and direction.

Back

A. Displacement is a vector quantity. 

B. Displacement measures the straight-line distance from start to finish. 

D. Displacement includes both magnitude and direction.

Front

Explain the difference between average speed and instantaneous speed.

Back

- Average speed is the total distance traveled divided by the total time taken. 

- Instantaneous speed is the speed at a particular moment in time. 

- Average speed does not account for variations in speed during the journey, while instantaneous speed does.

Front

Rank the following scenarios in order of increasing speed (smallest to largest): 

1. A car moving at 20 m/s north. 

2. A car moving at 15 m/s south. 

3. A car moving at 20 m/s east. 

4. A car at rest.

Back

4 < 2 < 1 = 3 

Front

A ball is thrown straight up into the air. What happens to its velocity and acceleration at the highest point of its motion?

Back

At the highest point, the velocity is 0. The acceleration is 9.8 m/s² (downwards) the entire time!

Front

Correct this statement: 

"Acceleration always increases when an object moves in a straight line."

Back

Corrected statement: 

"Acceleration can increase, decrease, or remain constant when an object moves in a straight line, depending on changes in speed or direction."

Front

Compare displacement and distance. How are they similar, and how are they different?

Back

- Similarities: Both measure how far an object has moved. 

- Differences: Distance is a scalar quantity (only magnitude), while displacement is a vector (magnitude and direction). Displacement is the shortest path between two points, while distance is the total path traveled.

Front

An object is in free fall. Which of the following is true? 

A. Its velocity is constant. 

B. Its acceleration is constant and equal to 9.8 m/s² downward. 

C. Its velocity is always increasing upward. 

D. Its acceleration changes over time.

Back

B. Its acceleration is constant and equal to 9.8 m/s² downward.