Unit 1 Physical Science Test Review

A velocity vs. time graph is shown. What is the acceleration of the object?

4 m/s2

Which is an example of speed?

A dog runs an average of 8 mph.

Which formula is used to calculate average velocity?

V avg = Xf- Xi/ Tf-Ti

Study the motion map shown. Some of the vectors have been circled. What do the circled vectors represent?

acceleration

Unlike velocity, speed is scalar, which means it is described by ______________________ only

magnitude

Walt ran 5 kilometers in 25 minutes, going eastward. What was his average velocity?

0.2 km/min east

A truck heading east has an initial velocity of 6 m/s. It accelerates at 2 m/s2 for 12 seconds. What distance does the truck travel in the given time?

216 m

Xavier is roller skating at 14 km/h and tosses a set of keys forward on the ground at 8 km/h. The speed of the keys relative to the ground is

22 km/h

A position-time graph is shown for a motorcycle driving south. According to the graph, what is the motorcycle's average velocity?

24 km/h south

Study the velocity vs. time graph shown. What is the displacement of the object from 2 seconds to 6 seconds?

24 m

A velocity vs. time graph for an object is shown. Which parts of the graph represents the object moving at a constant, positive acceleration?

W and X

The chart shows data for four moving objects. Which object has the greatest acceleration?

Y

Which formula is used to find an object's acceleration?

a = Delta v/ Delta t

For motion maps that illustrate accelerated motion, what does a new level indicate?

change in acceleration or direction

Which characteristic does an object with a constant acceleration always have?

changing velocity

The ________________ of a position-time graph represents an object's velocity.

slope

Suppose the initial position of an object is zero, the starting velocity is 3 m/s and the final velocity was 10 m/s. The object moves with constant acceleration. Which part of a velocity vs. time graph can be used to calculate the displacement of the object?

the area of the rectangle plus the area of the triangle under the line

The diagram shows a motion map. Which best describes the motion of the object between 1 and 4 seconds?

The object has negative acceleration and eventually stops.

The chart shows data for a moving object. Which conclusion is best supported by the information in the chart?

The object is not accelerating

The diagram shows a motion map for a train. Which statement is supported by the motion map?

The train stopped for 3 seconds.

Rosa studies the position-time graph of two race cars. Rosa concludes that truck X has a greater velocity than truck Y, and that truck Y had a head start. She also concluded that the graph shows both trucks moving at a constant velocity and that neither truck changes direction. statement best describes Rosa's error?

Truck Y has a greater velocity than truck X.

Simon is riding a bike at 12 km/h away from his friend Keesha. He throws a ball at 5 km/h back to Keesha, who is standing still on a sidewalk.

7 km/h

Alana is skateboarding at 19 km/h and throws a tennis ball at 11 km/h to her friend Oliver who is behind her leaning against a wall. What is the speed of the tennis ball if someone was watching the exchange on the sidewalk?

8 km/hr

An object moving north with an initial velocity of 14 m/s accelerates 5 m/s2 for 20 seconds. What is the final velocity of the object?

114 m/s

Ingrid is participating in a relay race. While jogging at 9 km/h, she tosses a relay stick at 16 km/h to her teammate, who is standing still. How fast is the relay stick moving relative to Ingrid?

16 km/h

Paco was driving his scooter west with an initial velocity of 4 m/s. He accelerates at 0.5 m/s2 for 30 seconds. What is his final velocity?

19 m/s

Diego is playing basketball. While running at 7 km/h toward Gino, he passes the ball to Gino horizontally. The ball travels at 20 km/h relative to Diego. What is the speed of the ball relative to Gino?

27 km/h

A motion map for a motorcycle is shown. At which second does the motorcycle start to have positive acceleration?

4

A train moving west with an initial velocity of 20 m/s accelerates at 4 m/s2 for 10 seconds. During this time, the train moves a distance of ____________________ meters

400

Rhea kicks a soccer ball at 13 km/h to Sean. After kicking the ball, the speed of the soccer ball from Rhea's reference frame is 13 km/h. The speed of the soccer ball from Sean's reference frame is 22 km/h. Which conclusion is best supported by the information?

Sean is standing still, and Rhea is running toward Sean while kicking the ball.

The ______________________ of the line on a velocity vs. time graph represents acceleration.

Slope

Deena made a chart to summarize features of a velocity vs. time graph for objects with constant acceleration and objects with constant velocity. Which best describes Deena's error?

The area of the rectangle and the triangle under the line should be added together for constant acceleration

Study the position-time graph for a bicycle. Which statement is supported by the graph?

The bicycle is not in motion.

How is constant velocity indicated on a motion map?

by vectors that are all the same length

Average velocity is different than average speed because calculating average velocity involves

displacement

Which three characteristics of an object are represented by a motion map?

position, acceleration, velocity

What does the x represent on a motion map?

reference point

Which best describes a reference frame?

the position from which something is observed

When compared to others, how is a greater velocity represented on a motion map?

with longer vectors

An object moving at a constant velocity will always have a

zero acceleration