Answers2003390-Physics 1 Honors Sem. 1 - PetersCircular Motion

Lesson 5: Circular Motion Answers

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1
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Which motion maps show an object in uniform circular motion? Check all that apply.VWXYZ

Question illustration
A
V
B
W
C
X
D
Y
E
Z
2
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A
gravity
B
inertia
C
centripetal force
D
centrifugal force
3

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

Question illustration
A
tension
B
gravity
C
friction
D
normal
4

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.

A
1.9 N
B
23 N
C
59 N
D
93 N
5

Without inertia, how would an object that is experiencing a centripetal force behave?

A
It would move in a line away from the circle’s center.
B
It would move in a line toward the circle’s center.
C
It would move in a curved, circular path.
D
It would move in a line tangent to the circular path.
6

A remote-controlled plane has a mass of 0.386 kg and flies in a circle with a radius of 75 m. The centripetal force on the plane is 4.0 N.

A
11 m/s
B
28 m/s
C
45 m/s
D
784 m/s
7

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.

A
1.3 m/s
B
1.8 m/s
C
46 m/s
D
870 m/s
8

How does a centripetal force cause circular motion?

A
It acts at a right angle to the object’s motion and causes the object to constantly change direction.
B
It acts at a right angle to the object’s motion and causes the object to constantly change speed.
C
It acts in the direction of the object’s motion and causes the object to constantly change direction.
D
It acts in the direction of the object’s motion and causes the object to constantly change speed.
9

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.

A
3.7 kg
B
13 kg
C
23 kg
D
79 kg
10

A centripetal force causes circular motion because it accelerates an object

A
toward the center of a circle, which changes the direction of motion but not the speed.
B
toward the center of a circle, which changes the speed of motion but not the direction.
C
along the edge of a circle, which changes the direction of motion but not the speed.
D
along the edge of a circle, which changes the speed of motion but not the direction.
11

Suchita makes a table to identify the variables used in the equations for centripetal force.

Question illustration
A
X: tangential speedY: radius
B
X: radiusY: tangential speed
C
X: centripetal forceY: mass
D
X: massY: centripetal force
12

An object is represented by the dot on the motion map.

Question illustration
A
a satellite in orbit around a moon
B
a child on a swing that just stopped
C
a ball twirled on a string that just broke
D
a car driving around a curve
13

Lucia wants to change the motion map shown so that it shows uniform circular motion.

Question illustration
A
She should change the length of each vector that is tangent to the circle so that it is the same as the vector pointing toward the center at that point.
B
She should change the direction of the vectors that are toward the center of the circle so that each points tangent to the circle opposite the existing tangent vectors.
C
She should change the direction of the vectors that are toward the center of the circle so that each points away from the center of the circle.
D
She should change the lengths of the vectors that point toward the center so that each is the same length.
14

An object is in circular motion. How will the object behave if the centripetal force is removed?

A
It would move in a line away from the circle’s center.
B
It would move in a line toward the circle’s center.
C
It would move in a curved, circular path.
D
It would move in a line tangent to the circular path.
15

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

Question illustration
A
tension
B
gravity
C
friction
D
normal
16

Lucia wants to change the motion map shown so that it shows uniform circular motion.

Question illustration
A
She should change the length of each vector that is tangent to the circle so that it is the same as the vector pointing toward the center at that point.
B
She should change the direction of the vectors that are toward the center of the circle so that each points tangent to the circle opposite the existing tangent vectors.
C
She should change the direction of the vectors that are toward the center of the circle so that each points away from the center of the circle.
D
She should change the lengths of the vectors that point toward the center so that each is the same length.
17

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

A
The dots are different distances apart.
B
Acceleration vectors point in the direction of motion.
C
Velocity vectors are always perpendicular to the circle.
D
Acceleration vectors point toward the center of the circle.
E
Velocity vectors are the same length.
18

Julius competes in the hammer throw event. The hammer has a mass of 7.26 kg and is 1.215 m long.

A
190 N
B
840 N
C
1,400 N
D
6,100 N
19

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.

A
1.9 N
B
23 N
C
59 N
D
93 N
20

Suchita makes a table to identify the variables used in the equations for centripetal force.

Question illustration
A
X: tangential speedY: radius
B
X: radiusY: tangential speed
C
X: centripetal forceY: mass
D
X: massY: centripetal force

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