Chapter 2.1-2.4 Quiz

The branch of physics that deals with motion is called mechanics.  Kinematics is the portion of mechanics that describes motion without any reference to which of the following concepts?

• forces
• accelerations
• velocities
• displacements

A particle travels along a curved path between two points A and B.  Complete the following statement: The displacement of the particle does not depend on

• the location of A
• the location of B
• the direction of A from B
• the distance traveled from A to B

Complete the following statement: A displacement vector

• is directed from an object’s final position toward its initial position.
• is always directed along a tangent to the object’s path.
• has a magnitude that always equals the distance the object traveled from its initial position to its final position.
• is directed from an object’s initial position toward its final position. 

Which one of the following quantities is defined as the distance traveled divided by the elapsed time for the travel?

• average speed
• average velocity
• average acceleration
• instantaneous velocity

A train leaves a station, starting from rest, at time t = 0.0 s.  At time t = 3600.0 s, the train is traveling due west at 28 m/s.  In this example, the 28 m/s is the train’s

• average speed
• average velocity
• instantaneous velocity
• instantaneous acceleration

Complete the following statement: For an object moving at constant velocity, the distance traveled

• increases for each second that the object moves.
• is the same for each second that the object moves.
• cannot be determined, even if the elapsed time is known.
• decreases for each second that the object moves.

Which one of the following situations does the object have no acceleration?

• A ball at the end of a string is whirled in a horizontal circle at a constant speed.
• Seeing a red traffic light ahead, the driver of a minivan steps on the brake.  As a result, the minivan slows from 15 m/s to stop before reaching the light.
• A boulder starts from rest and rolls down a steep mountain.
• An elevator in a tall skyscraper moves upward at a constant speed of 3 m/s.

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NGSS.HS-PS2-1

A postal truck driver driving due east gently steps on her brake as she approaches an intersection to reduce the speed of the truck.  What is the direction of the truck’s acceleration, if any?

• due north
• due east
• due west
• There is no acceleration in this situation.

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NGSS.HS-PS2-1

A sports car starts from rest.  After 10.0 s, the speed of the car is 25.0 m/s.  What is the magnitude of the car’s acceleration?

• 2.50 m/s²
• 10.0 m/s²
• 25.0 m/s²
• 250 m/s²

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NGSS.HS-PS2-1

In the four equations of kinematics for constant acceleration given in the text, there are five variables.  What is the minimum number of variables you must know in order to determine all five variables by using the equations?

• 1
• 2
• 3
• 4