1.
Speed in a specific direction is
Correct Answer
D. Velocity
Explanation
Velocity refers to speed in a specific direction. It is a vector quantity that includes both the magnitude (speed) and direction of an object's motion. While speed only indicates how fast an object is moving, velocity provides additional information about the object's displacement and the direction it is moving in. Therefore, velocity is the correct answer in this context.
2.
A change of position.
Correct Answer
A. Motion
Explanation
The term "motion" refers to a change in position of an object over time. It encompasses all types of movement, including changes in location, speed, velocity, and acceleration. Therefore, motion is the most appropriate answer as it encompasses all the other options and is a general term that describes any change in position.
3.
A change in position over time is....
Correct Answer
C. Motion
Explanation
A change in position over time refers to the concept of motion. Motion is the movement of an object from one place to another over a period of time. It involves a change in the position of an object with respect to a reference point. Therefore, motion is the correct answer in this context.
4.
An object's location is
Correct Answer
B. Position
Explanation
Position refers to the location of an object in relation to a reference point. It is a fundamental concept in physics and describes where an object is located in space. It does not take into account the object's motion, speed, velocity, or acceleration, but simply provides information about its location.
5.
The location from where you measure the change in position is
Correct Answer
A. Reference point
Explanation
A reference point is the location from which you measure the change in position. It serves as a starting point or a point of comparison to determine the displacement or movement of an object. By establishing a reference point, you can calculate the distance and direction of an object's movement accurately. Therefore, a reference point is essential in determining the change in position of an object.
6.
The rate at which velocity changes over time is
Correct Answer
E. Acceleration
Explanation
Acceleration is the correct answer because it is defined as the rate at which velocity changes over time. It measures how quickly an object's velocity is changing, either by speeding up, slowing down, or changing direction. Acceleration is a vector quantity, meaning it has both magnitude and direction, just like velocity. It is an important concept in physics to understand the changes in motion and how forces affect objects.
7.
A quantity with both size and direction is
Correct Answer
C. Vector
Explanation
A vector is a quantity that has both size and direction. It represents a physical quantity, such as displacement, velocity, or force, that can be described by its magnitude (size) and its direction in space. Speed is a scalar quantity as it only represents the magnitude of motion without any direction. Velocity, on the other hand, is a vector as it represents both the speed and direction of an object's motion. Acceleration is also a vector quantity as it represents the rate at which an object's velocity changes, including its direction. Noodles is not a relevant option and can be disregarded.
8.
A position describes an object's location compared to
Correct Answer
B. A reference point
Explanation
A position describes an object's location compared to a reference point. This means that the position of an object is determined by its distance and direction from a fixed point. By using a reference point, we can accurately describe the location of an object and understand its spatial relationship to other objects or points in the surroundings.
9.
Maria walked 2km in half an hour. What was her average speed during her walk?
Correct Answer
D. 4 km/hr
Explanation
Maria walked 2km in half an hour, so her average speed can be calculated by dividing the distance traveled (2km) by the time taken (0.5 hours). Therefore, her average speed during her walk is 4 km/hr.
10.
A vector is a quality that has
Correct Answer
C. Size and direction
Explanation
A vector is a quantity that has both size and direction. This means that it not only represents a magnitude or amount, but also the specific direction in which it is applied or measured. For example, velocity is a vector quantity as it includes both the speed (magnitude) and the direction of motion. Similarly, force and displacement are also vector quantities as they have both magnitude and direction associated with them.
11.
Mary and Keisha run with the same constant speed but in opposite directions. The girls have
Correct Answer
D. Different velocities
Explanation
Since Mary and Keisha are running in opposite directions, their velocities will have opposite signs. Even though they have the same constant speed, the direction of their velocities is different, making their velocities different. Therefore, the correct answer is different velocities.
12.
A swimmer increases her speed as she approaches the end of the pool. Her acceleration is
Correct Answer
A. In the same direction as her motion
Explanation
The swimmer increasing her speed as she approaches the end of the pool indicates that her velocity is changing in the same direction as her motion. Acceleration is the rate at which velocity changes, so if her speed is increasing, it means her velocity is increasing in the same direction. Therefore, her acceleration is also in the same direction as her motion.
13.
A cheetah can go from 0 m/s to 20 m/s in 2 s. What is the cheetah's acceleration?
Correct Answer
C. 10 m/s2
Explanation
The cheetah's acceleration can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. In this case, the final velocity is 20 m/s, the initial velocity is 0 m/s, and the time is 2 s. Plugging these values into the formula, we get (20 m/s - 0 m/s) / 2 s = 10 m/s2. Therefore, the cheetah's acceleration is 10 m/s2.
14.
Jon walks for a few minutes, then runs for a few minutes. During this time, his average speed is
Correct Answer
C. Less than his final speed
Explanation
During the period where Jon walks for a few minutes and then runs for a few minutes, his average speed is less than his final speed. This is because the average speed is calculated by dividing the total distance traveled by the total time taken. Since Jon spends more time walking than running, and walking is generally slower than running, his average speed will be lower than his final speed.
15.
Suppose you are biking with a friend. How would your friend describe your relative motion as he passes you?
Correct Answer
A. You are moving backward
Explanation
If the friend is passing you while you are biking, it means that your friend is moving faster than you. In this scenario, your friend would perceive your relative motion as moving backward because they are overtaking you.
16.
A person sitting in a chair gets up and runs to the door at 10m/s in 2 seconds. What is their acceleration?
Correct Answer
E. 5 m/s2
Explanation
The person's acceleration can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. In this case, the initial velocity is 0 m/s (since the person was sitting in a chair), the final velocity is 10 m/s (since they reached the door at that speed), and the time is 2 seconds. Plugging these values into the formula, we get: acceleration = (10 m/s - 0 m/s) / 2 s = 5 m/s^2. Therefore, the correct answer is 5 m/s^2.
17.
An object traveling at 20 m/s2 experiences no acceleration. Which one of these is true for the object.
Correct Answer
D. The object keeps moving at the same speed
Explanation
If an object is traveling at a constant speed of 20 m/s and experiences no acceleration, it means that there is no change in its velocity. Therefore, the object will continue to move at the same speed of 20 m/s.
18.
An object speeds up to 100 m/s over the course of 10 seconds. In order to calculate acceleration what other information do you need.
Correct Answer
C. The objects initial velocity
Explanation
To calculate acceleration, you need the object's initial velocity. This is because acceleration is the rate at which the velocity of an object changes over time. By knowing the initial velocity, you can determine the change in velocity and divide it by the time taken to find the acceleration. In this case, since the object's speed increased from 0 m/s to 100 m/s over 10 seconds, knowing the initial velocity would allow us to calculate the acceleration.
19.
A car goes from 20m/s to 30m/s in 10 seconds. What is the acceleration?
Correct Answer
E. 1 m/s2
Explanation
The acceleration of the car can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. In this case, the final velocity is 30m/s, the initial velocity is 20m/s, and the time is 10 seconds. Plugging in these values into the formula, we get acceleration = (30m/s - 20m/s) / 10s = 10m/s / 10s = 1m/s². Therefore, the correct answer is 1 m/s².
20.
A penguin going 10 m/s after 5 seconds is going 5 m/s. What is the penguins acceleration
Correct Answer
B. -1 m/s2
Explanation
The penguin's acceleration is -1 m/s2 because its velocity decreases from 10 m/s to 5 m/s in 5 seconds. A negative acceleration indicates a decrease in velocity.
21.
The space shuttle travels at 15,000 m/s in order to enter earth atmosphere it changes it's speed to 10,000 m/s over 100 seconds. What is the space shuttles acceleration?
Correct Answer
D. -50 m/s2
Explanation
The space shuttle's initial velocity is 15,000 m/s and its final velocity is 10,000 m/s. The change in velocity is calculated by subtracting the final velocity from the initial velocity, which gives us -5,000 m/s. The time taken for this change in velocity is 100 seconds. Acceleration is defined as the change in velocity divided by the time taken, so we divide -5,000 m/s by 100 seconds to get -50 m/s^2. Therefore, the space shuttle's acceleration is -50 m/s^2.
22.
Force has size and direction making it a
Correct Answer
D. Vector
Explanation
Force has both size (magnitude) and direction, which are the defining characteristics of a vector quantity. A vector quantity is a physical quantity that requires both magnitude and direction to be fully described. In the case of force, it is necessary to know both the strength (magnitude) of the force and the direction in which it acts in order to fully understand its effect on an object. Therefore, the correct answer is vector.
23.
When you change direction you change
Correct Answer
E. Veloctiy and acceleration
Explanation
When you change direction, you change both velocity and acceleration. This is because velocity is a vector quantity that includes both magnitude (speed) and direction, so when the direction changes, the velocity also changes. Similarly, acceleration is also a vector quantity that includes both magnitude and direction, so it also changes when the direction changes. Therefore, the correct answer is velocity and acceleration.
24.
A person traveling north 20 m/s would have what velocity south?
Correct Answer
B. -20 m/s
Explanation
A person traveling north at a velocity of 20 m/s would have a velocity south of -20 m/s. This is because velocity is a vector quantity that includes both magnitude and direction. In this case, the magnitude remains the same at 20 m/s, but the direction changes from north to south. The negative sign indicates the opposite direction.
25.
A person changes their velocity south of - 10 m/s to 20 m/s in one second. What is their acceleration?
Correct Answer
E. 30 m/s2
Explanation
The person changes their velocity from -10 m/s to 20 m/s in one second. To find acceleration, we can use the formula: acceleration = (final velocity - initial velocity) / time. Plugging in the values, we get: acceleration = (20 m/s - (-10 m/s)) / 1 s = 30 m/s^2. Therefore, the correct answer is 30 m/s^2.
26.
If Tampa is south of Spring Hill. Spring Hill is the
Correct Answer
C. Reference point
Explanation
The given question is incomplete and not readable. It is not clear what relation Tampa being south of Spring Hill has with determining the location, position, reference point, object, or map of Spring Hill. Thus, an explanation cannot be generated.
27.
The location of A is...
Correct Answer
B. North of B
Explanation
The correct answer is "North of B." This means that A is positioned in a direction that is above or higher than B.
28.
A person walks to C from B in 30 seconds.
Correct Answer
D. They have 0.1 m/s speed
Explanation
The person takes 30 seconds to walk from B to C, which indicates that they are moving at a slower pace. The option "They have 0.1 m/s speed" suggests that their speed is only 0.1 meters per second, which aligns with the given information.
29.
Which of the following will take the longest time to walk (assuming if all speeds are the same).
Correct Answer
B. Going from A to C to A
Explanation
Going from A to C to A will take the longest time to walk because it involves the longest distance. The other options either involve shorter distances or a more direct route, which would require less time to complete.
30.
Johnny goes from A to B at a speed of 0.5 m/s. How long does it take him get from A to B?
Correct Answer
D. 8 seconds
31.
Which runner reached the finish line first?
Correct Answer
A. Ashok
Explanation
Ashok reached the finish line first.
32.
How far did Juanita run in the first 4 seconds of the race?
Correct Answer
C. 25m
Explanation
In the first 4 seconds of the race, Juanita ran a distance of 25m.
33.
How much time passed between the time Angela finished the race and Cameron finished the race?
Correct Answer
B. 2 seconds
Explanation
The question asks for the amount of time that passed between Angela finishing the race and Cameron finishing the race. The correct answer is 2 seconds, indicating that Cameron finished the race 2 seconds after Angela.
34.
Which of the following setups would you use to calculate angela's average speed during the race?
Correct Answer
D. 50/7 m/s
Explanation
To calculate Angela's average speed during the race, we need to divide the total distance she covered by the total time taken. The setup that represents this calculation is the one with the fraction 50/7 m/s. This means that Angela covered a distance of 50 meters in 7 seconds, resulting in an average speed of 50/7 m/s.
35.
What can you say about the speed of all the runners?
Correct Answer
B. They ran at a constant pace but at different speeds.
Explanation
The correct answer is "They ran at a constant pace but at different speeds." This means that all the runners maintained a steady pace throughout the race, but each runner had their own individual speed. This suggests that some runners were faster than others, but they all maintained a consistent pace throughout the race.