AnswersHSPHY Physics Sem 1 26-27Centripetal Acceleration

Circular Motion Answers

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1
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How do inertia and centripetal force combine to keep an object moving in circular motion?

A
Centripetal force acts toward the center of the circle to overcome inertia, which acts away from the center.
B
Inertia acts toward the center of the circle to overcome centripetal force, which acts away from the center.
C
Centripetal force acts toward the center of the circle, and inertia keeps the object moving forward.
D
Inertia acts toward the center of the circle, and centripetal force keeps the object moving forward.
2
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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
3

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.
4

Scientists are making plans to put a probe in orbit around Earth. They want the probe to enter the orbit shown below.

Question illustration
A
W
B
X
C
Y
D
Z
5

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
6

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
7

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
8

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
9

[BLANK]

A
gravity
B
inertia
C
centripetal force
D
centrifugal force
10

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

Question illustration
A
V
B
W
C
X
D
Y
E
Z
11

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
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

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

A
It acts parallel to the velocity and is directed toward the center of the circle.
B
It acts parallel to the velocity and is directed away from the center of the circle.
C
It acts perpendicular to the velocity and is directed toward the center of the circle.
D
It acts perpendicular to the velocity and is directed away from the center of the circle.
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

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.
16

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.
17

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.
18

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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