• #### 1.  What happens to the centripetal force exerted on an object if you triple the velocity?

• it increases to 3X
• it decreases to 6X
• it increases to 6X
• it increases to 9X
• #### 2.  Which is true about centripetal force and centripetal acceleration?

• The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force is always pointing outward
• The centripetal acceleration is always pointing outward from the center of an orbit and the centripetal force is always pointing inward
• The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force also pointing toward the center but in a totally different location
• The centripetal acceleration is always pointing toward the center of an orbit and the centripetal force also pointing toward the center and in the same exact location as the centripetal acceleration
• #### 3.  If an object is spinning around on a string and the string was suddenly cut, the object would move in a

• curved path
• straight line

• True
• False

• 10.75 ms-1
• 10.95 m/s

• 300N
• 15000N
• 3375N
• 15N

• A
• B
• C
• D

• 18 N
• 36 N
• 72 N
• 144 N
• #### 9.  Decreasing the radius when making a turn allows you to____?

• Keep a high speed
• Decrease gravitational pull
• #### 10.  An object is moving in a circle at constant speed. From this, you know that there

• is no net force acting on the object
• are two balanced forces acting
• is an unbalanced force acting on the object
• must be more than two forces acting on the object

• 0.124 m
• 0.135 m

• 2.5 N
• 5.0 N
• 10.0 N
• 20.0 N
• #### 13.  A car moving around a curve at a constant speed of 150 mph is accelerating.

• True, because it is moving at a constant speed.
• True, because it is changing direction.
• False, because it is not a constant velocity.
• False, because it is moving at a constant speed.

• #### 15.  When an object is moving in a circle, its linear velocity is often called its __________ velocity.

• centripetal
• tangential
• gravitational
• centrifugal

• 188.50 m/s
• 188.70 ms-1

• 2.05 N
• 2.57 N
• 2.90 N
• 3.13 N
• #### 18.  Which of the following is the best description of what is being depicted (only one answer is correct)?

• Tangential Velocity
• Centripetal Acceleration
• Axis of rotation
• Angular velocity
• #### 19.  Why do objects experience centripetal acceleration even though they can have a constant speed?

• Because they are speeding up as they move in a circle
• Because they are constantly changing direction and hence, velocity changes, and that net change is directed inward.
• Because they are constantly changing both speed and direction
• Because when you have 100 people pedaling, you can speed up more easily.
• #### 20.  You swing a bucket of water attached to a string in a circle above your head. What keeps the water in the bucket?

• Friction
• Centripetal Force
• Gravity
• Inertia
• #### 21.  Both centripetal force and centripetal acceleration are directed

• away from a central point
• toward a central point