Equation for acceleration:
Acceleration =

Acceleration
CHECK YOUR UNDERSTANDING
An automobile cannot maintain a constant speed
when
A. accelerating.
B.
rounding a curve.
C.
both of the above
D.
none of the above

Acceleration
CHECK YOUR ANSWER
An automobile cannot maintain a constant speed when
A. accelerating.
B.
rounding a curve.
C.
both of the above
D.
none of the above
Comment:
When rounding a curve, the automobile is accelerating
because it is changing direction.

Acceleration
CHECK YOUR UNDERSTANDING
Acceleration and velocity are actually
A.
much the same.
B.
rates, but for different quantities.
C.
the same when direction is not a factor.
D.
the same for free-fall situations.

Acceleration
CHECK YOUR ANSWER
Acceleration and velocity are actually
A.
much the same.
B.
rates, but for different quantities.
C.
the same when direction is not a factor.
D.
the same for free-fall situations.
Explanation:
Velocity is the rate at which distance changes with time;
acceleration is the rate at which velocity changes with time.

Acceleration
Free fall
When the only force acting on a
falling object is gravity (with
negligible air resistance), the
object is in a state of free fall.

Acceleration
CHECK YOUR UNDERSTANDING
If a falling object gains 10 m/s each second it falls,
its acceleration is
A.
10 m/s.
B.
10 m/s per second.
C. both of the above
D. neither of the above

Acceleration
CHECK YOUR ANSWER
If a falling object gains 10 m/s each second it falls,
its acceleration is
A. 10 m/s.
B. 10 m/s per second.
C. both of the above
D. neither of the above
Explanation:
It is common to express 10 m/s per second as 10
m/s/s, or 10 m/s
2
.

Acceleration
CHECK YOUR UNDERSTANDING
A free-falling object has a speed of 30 m/s at one
instant. Exactly one second later its speed will be
A.
the same.
B.
35 m/s.
C. greater than 35 m/s.
D. 60 m/s.

Acceleration
CHECK YOUR ANSWER
A free-falling object has a speed of 30 m/s at one
instant. Exactly one second later its speed will be
A. the same.
B. 35 m/s.
C. greater than 35 m/s.
D. 60 m/s.
Explanation:
One second later its speed will be 40 m/s, which is
greater than 35 m/s.

Acceleration
CHECK YOUR UNDERSTANDING
The distance fallen by a free-falling body
A.
remains constant each second of fall.
B.
increases each second when falling.
C.
decreases each second when falling.
D.
none of the above

Acceleration
CHECK YOUR ANSWER
The distance fallen by a free-falling body
A.
remains constant each second of fall.
B.
increases each second when falling.
C.
decreases each second when falling.
D.
none of the above
Explanation:
See Table 2.2 for verification of this. Falling
distance
time squared.

#### You've reached the end of your free preview.

Want to read all 61 pages?

- Spring '14
- AnnM.Robinson