Representing Motion (College Board AP® Physics 1: Algebra-Based)

Exam Questions

5 mins5 questions

1 mark

Between $t = 0 s$ and $t = 1 s$ an object has a constant velocity of $18 m / s$ in the $x$ direction, after which the object is provided with a constant acceleration of $9 m / s^{2}$ in the negative $x$ direction.

What is the position of the object at $t = 8 s$ ?

$76 m$ in the $x$ direction
$76 m$ in the $- x$ direction
$77 m$ in the $x$ direction
$77 m$ in the $- x$ direction

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1 mark

Two cars are driving in the same direction on a freeway. A farmer in a nearby field watches the cars pass by. The red car is traveling at a constant velocity of $30 m / s$ and the blue car is traveling at a constant velocity of $40 m / s$ , relative to the farmer. The blue car overtakes the red car in the next lane.

Which of the following shows the correct velocities of both the blue car and the farmer from the reference frame of the red car?

Blue car
Farmer
$- 10 m / s$
$30 m / s$
Blue car
Farmer
$10 m / s$
$- 30 m / s$
Blue car
Farmer
$30 m / s$
$0 m / s$
Blue car
Farmer
$- 30 m / s$
$- 40 m / s$

Blue car	Farmer
$- 10 m / s$	$30 m / s$

Blue car	Farmer
$10 m / s$	$- 30 m / s$

Blue car	Farmer
$30 m / s$	$0 m / s$

Blue car	Farmer
$- 30 m / s$	$- 40 m / s$

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1 mark

A bullet is fired vertically upwards with an initial velocity of $370 m / s$ .

Which of the following is the correct velocity of the bullet after $10 s$ and after $60 s$ ?

$t = 10 s$
$t = 20 s$
$- 230 m / s$
$270 m / s$
$t = 10 s$
$t = 20 s$
$- 270 m / s$
$230 m / s$
$t = 10 s$
$t = 20 s$
$230 m / s$
$- 270 m / s$
$t = 10 s$
$t = 20 s$
$270 m / s$
$- 230 m / s$

$t = 10 s$	$t = 20 s$
$- 230 m / s$	$270 m / s$

$t = 10 s$	$t = 20 s$
$- 270 m / s$	$230 m / s$

$t = 10 s$	$t = 20 s$
$230 m / s$	$- 270 m / s$

$t = 10 s$	$t = 20 s$
$270 m / s$	$- 230 m / s$

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