# AccelerationSlidesx - ptsos

Mechanics

Nov 14, 2013 (4 years and 8 months ago)

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Constant Acceleration

A Difficult Concept
that You Can Feel!

Which of the Following are
Possible Situations?

1.
An object has zero velocity and positive acceleration

2.
An object has zero acceleration and positive velocity

3.
An object has increasing velocity and decreasing
acceleration

4.
An object has negative velocity and positive

acceleration

A.
2 Only

B.
4 Only

C.

2 and 3 Only

D.
1 and 4 Only

E.

All are possible

Which of the Following Have a
Positive Acceleration?

1.
Speeding up while moving in the + direction

2.
Slowing down while moving in the + direction

3.
Slowing down while moving in the
-

direction

4.
Speeding up while moving in the
-

direction

A.
1 and 4 Only

B.
1 Only

C.
4 Only

D.
1 and 3 Only

Which of the Following Have a
Zero Acceleration?

1.
Airplane flying level due east at a constant 500
mph

2.
Child on a spinning merry
-
go
-
round

3.
Ball thrown straight up at its highest point

4.
Ball reversing direction after rolling up a ramp

A.
1 Only

B.
1 and 2 Only

C.
1, 3 and 4 Only

D.
1 and 3 Only

A Ball is Given a + Initial
Velocity and then Rolls up a
Ramp as Shown Below

What will happen to its Velocity and
Acceleration as it Rolls up the Ramp?

A.
V Decreases, A Increases

B.
V Decreases, A Decreases

C.
V Decreases, A Constant

D.
V Constant, A Constant

+

The Ball Continues up the Ramp
and Reaches Its Highest Point

What is the Ball

s Acceleration at this
Point?

A.
Zero

B.
Smaller than Before, but not zero

C.
Same as Before, but changes sign

D.
Same as Before

+

The Ball is Now Rolling Back
Down the Ramp

What will happen to its Velocity and
Acceleration as it Rolls Down the Ramp?

A.
V Increases, A Increases

B.
V Increases, A Decreases

C.
V Decreases, A Constant

D.
V Constant, A Constant

+