PHYSICS

23 N

A ball that has a mass of 0.25 kg spins in a circle at the end of a 1.6 m rope. The ball moves at a tangential speed of 12.2 m/s. What is the centripetal force acting on the ball?

23 kg

A child on a spinning playground ride is 0.36 m from the center of the ride. The centripetal force on the child is 19 N. What is the mass of the child if the child has a tangential speed of 0.54 m/s?

-4.3 km

A jogger runs 5.0 km on a straight trail at an angle of 60° south of west. What is the southern component of the run rounded to the nearest tenth of a kilometer?

24 km/h south

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

94

A runner moves west with an initial velocity of 4 m/s. She accelerates 3 m/s2 for 30 seconds. The runner's final velocity is

216 m

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?

4 m/s2

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

1.3 m/s

A wrecking ball has a mass of 650 kg. It swings from a cable that is 21 m long. The centripetal force on the ball is 56 N. What is the tangential speed of the wrecking ball?

a ball twirled on a string that just broke

An object is represented by the dot on the motion map. Which object is most likely represented by the motion map?

Zero Acceleration

An object moving at a constant velocity will always have a

interia

As a truck rounds a curve, a box in the bed of the truck slides to the side farthest from the center of the curve. This movement of the box is a result of

It does not exhibit projectile motion and follows a straight path down the ramp.

Barry is conducting an experiment and rolls a tennis ball down a ramp. Which best describes the motion of the tennis ball?

The paper airplane's motion is due to horizontal inertia and the vertical pull of gravity.

Charlotte throws a paper airplane into the air, and it lands on the ground. Which best explains why this is an example of projectile motion?

27 km/h

Diego is playing basketball. While running at 7 km/h toward a basketball hoop, he throws the ball at the net. The ball travels at 20 km/h. What is the speed of the ball relative to the net?

change in acceleration or direction

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

Acceleration vectors point toward the center of the circle. Velocity vectors are the same length.

In a uniform circular motion map, what is always true? Check all that apply.

-9.8 m/s2

In the formula vy = ayt, what is the value of ay for an object in projectile motion?

16 km/h

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?

gravity

Johanna makes the table below to organize her notes about centripetal forces. Which type of force should she place in the cell marked X?

6,100 N

Julius competes in the hammer throw event. The hammer has a mass of 7.26 kg and is 1.215 m long. What is the centripetal force on the hammer when it has a tangential speed of 31.95 m/s? The answer is rounded off to the nearest whole number.

21.7 m/s

Lexy throws a dart with an initial velocity of 25 m/s at an angle of 60° relative to the ground. What is the approximate vertical component of the initial velocity?

kite flying on a string

Mohammed made a chart to list examples and nonexamples of projectile motion. Which best completes the chart?

horizontal and vertical

Projectile motion is a combination of which two types of motion?

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

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?

the horizontal displacement of a projectile launched at an angle

Rosa uses the formula (vi cos)t to do a calculation. Which value is Rosa most likely trying to find?

7 km/h

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. How fast would Keesha say the ball is traveling?

acceleration

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

72 cm

Study the vector diagram. What is the magnitude of vector X?

24 m

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

The marble's horizontal velocity changes, but its vertical velocity does not.

Sung rolls a marble off the edge of a table. She rolls the marble off the same table again but at a different speed. Which best describes the projectile motion of the marble as it leaves the table at the two different speeds?

B2 = R2 - A2

Suppose two initial vectors intersect at a right angle and form a resultant vector. The magnitudes of one initial vector, A, and the resultant vector, R, are given. Which formula can be used to find the magnitude of the other initial vector, B?

slope

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

The object is not accelerating.

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

C

The diagram shows components that have been added together to form Rx and Ry. Rx and Ry are the components of the resultant vector. Which formula can be used to find the angle of the resultant vector?

10

The diagram shows three different bicycle routes taken by Frank, Alexis, and Juan to get to the electronics store. According to the diagram, Juan traveled _____ kilometers.

Vectors Px and Py are components of vector P.

The diagram shows three vectors. Which best describes a relationship among the vectors?

36.9°

The diagram shows vectors that are not perpendicular to one another. What is the angle of the resultant vector, rounded to the nearest tenth?

Vector Y has greater magnitude than vector X

Two vectors are shown. Which statement best compares the vectors?

50 inches.

Two vectors, X and Y, form a right angle. Vector X is 48 inches long and vector Y is 14 inches long. The length of the resultant vector is

It acts perpendicular to the velocity and is directed toward the center of the circle.

What must be true of a force that causes an object to move in a circular motion?

a position from which something is observed

Which best describes a reference frame?

R2 = A2 + B2

Which equation represents the Pythagorean theorem, which can be used to find the magnitude of resultant vectors?

D

Which formula can be used to calculate the horizontal displacement of a horizontally launched projectile?

C

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

A dog runs an average of 8 mph

Which is an example of speed?

11

While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame, the speed of the tennis ball is