Answers DISD CR Physics 2020-2021Projectile Motion

Projectile Motion — Unit test Answers

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Hannah made a chart to describe speed and velocity.

Switch the chart headings “Speed” and “Velocity.”

Describe the calculation for speed as “dividing distance by time.”

In the “Speed” column, change “has magnitude” to “is a displacement.”

Change the last row of the “Velocity” column to “does not depend on a reference frame.”

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A car drives 16 miles south and then 12 miles west. What is the magnitude of the car’s displacement?

4 miles

16 miles

20 miles

28 miles

What is the vertical acceleration of a dart that is launched horizontally with an initial velocity of 2.3 m/s?

–9.8 m/s2

0 m/s2

2.3 m/s2

9.8 m/s2

The diagram shows a position-time graph.

–2 m

–1 m

3 m

4 m

Which graph shows an object with constant acceleration?

Option

A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 10, and velocity in meters per second on the y axis, numbered 0 to 50. A line starts at the origin and goes to (4, 40), then a line from (4, 40) to (9, 40) and a line from (9, 40) to (10, 0).

A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, and velocity in meters per second on the y axis, numbered 0 to 10. A line starts at (0, 10) and ends at (5, 0).

A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, velocity in meters per second on the y axis, numbered 0 to 35. A curved line starts at the origin and arcs up to (4.3, 35).

A boat travels in a straight path that is 25° west of north. Which describes the values of the west and north components of the boat’s displacement?

Both components are positive numbers.

Both components are negative numbers.

The west component is a negative number, and the north component is a positive number.

The west component is a positive number, and the north component is a negative number.

Motion maps for two objects, Y and Z, are shown.At which time does Object Y pass Object Z?

speedvelocitypositiondirection

speed

velocity

position

direction

The motion map shows an object’s position and velocity at given times.How can the map be changed so it shows constant acceleration after the object changes direction?

by adding vectors that are all the same length and placing them above the current top row of vectors

by adding vectors that gradually increase in length and placing them above the current top row of vectors

by adding vectors that are all the same length and placing them below the current bottom row of vectors

by adding vectors that gradually increase in length and placing them below the current bottom row of vectors

Which best illustrates projectile motion?

A pictorial diagram showing a hot air balloon in four different positions, each the same height from the ground and equally spaced.

A pictorial diagram with a rocket launched straight upward. The first three positions of the rocket are shown with equal spacing between them.

A pictorial diagram with a person swimming and position shown in equal time intervals and equally spaced.

A pictorial diagram of a person hopping sideways at 5 different positions. The start and end positions are on the ground. The third image is the highest off the ground.