Question | Answer |
A driver of an SUV drives past a jogger on the subdivision walking path. Relative to the jogger, the SUV is traveling 15 m/s. What is the reference point in this situation? | the jogger |
The hands of a clock relative to the numbers on a clock or the speed of a bicycle relative to the direction of travel. Which of the following most closely illustrates motion by relating it to a reference point? | The hands of a clock relative to the numbers on a clock |
What are two factors that determine speed? | distance and time |
What is the difference between speed and velocity? | One has direction, and the other does not |
What best represents acceleration as presented on a graph? | velocity change vs. time |
What is an object that appears to stay in place that helps you detect motion in another object? | a reference point |
What do you need to know to calculate an object's acceleration? | starting velocity |
How do you calculate average speed? | divide the total distance traveled by the total time |
What is the difference between speed and velocity? | velocity has direction, while speed does not |
A hiker's velocity begins at 1.8 m/s uphill and changes to 1.5 m/s uphill. How do you know the hiker has a negative acceleration? | his speed decreased |
What is an object that appears to stay in place that helps you detect motion in another object? | a reference point |
What do you need to know to calculate an object's acceleration? | starting velocity, final velocity, and time it takes to change velocity |
What would you call a building if you compared it with a moving student? | a reference point |
When something changes position, what is it doing? | It is moving |
What two things does speed depend on? | distance and time |
What is the SI unit for speed? | m/s |
What is motion? | Any change in position over time |
What is the speed of an object in a particular direction? | velocity |
Your speed is not changing, but your direction is changing. What are you still doing? | accelerating |
What is the driver's velocity if a driver's acceleration is positive? | increasing |
What distinguishes the measurement of speed from that of velocity and acceleration? | speed does not involve direction, but both velocity and acceleration do |
What is centripetal acceleration? | acceleration that occurs in a circular motion |