First Review

1. How long will it take a car to accelerate from 20 m/s to 26 m/s at a rate of 1.4 m/s²? 

• 2.2 s
• 2.7 s 
•  4.3 s 
• 4.6 s

In which of the following time intervals is the speed of the object decreasing?  

• between 0s and 2s 
• between 2s and 4s 
•  between 6s and 8s 
•  between 8 s and 10 s

The graph would most likely apply to which of the following events?

• A soccer ball that is at rest is suddenly kicked. 
• A ball is thrown upward and returns to the ground.  
•  A person who is running at a constant speed decides to run faster. 
• A car traveling at a constant speed applies its brakes and comes to a stop.

According to the graph, during which interval is the cat at rest?  

• 0.0s to 5.0s 
• 5.0s to 10.0s
•  10.0s to 15.0s
• 15.0s to 20.0s

Which of the following is a physical quantity that has both magnitude and direction? 

• Vector 
• Scalar 
• Resultant
•  Frame of reference

A student leaving school walks 2.5 km north and then walks 1.0 km south. What is the student’s displacement? 

• 1.0 km south
•  1.5 km north
•  2.5 km north 
• 3.5 km south

David, who is at rest, observes Jack moving away from him to the left with a speed of 1 m/s. At the same time, David sees Mary move away from him to the right at a speed of 2 m/s. At what speed does Mary see Jack moving? 

• 0 m/s 
• 1m/s 
• 2 m/s 
• 3 m/s

An elevator in an office building completed the following trips: · 1st floor to 8th floor · 8th floor to 4th floor · 4th floor to 13th floor The distance between each floor of the office building is 4.0 m. Which choice shows the total distance traveled and displacement of the elevator?

• distance 48m displacement 80m
• distance 80m displacement 48m
• distance 80m displacement 80m
• distance 48m displacement 48m

Two students are in-line skating. The diagram below shows student S pushing student T. Student S has a mass of 60 kg, and student T has a mass of 40 kg. Student S is pushing student T in a straight line with a force equal to the friction on student T’s skates. Which of the following must happen if student S continues to push student T with the same force? 

• Student T will travel in a circle 
• Student T will lose his balance 
• Student T will move at a constant velocity 
• Student T will move at a constant acceleration

Each figure below shows a force measured in Newtons pushing on a block. If there are no other forces pushing on the block, in which case is the acceleration of the block greatest?

• A
• B
• C
• D