Speed & Velocity
Acceleration
Scalar and Vector quantity
Free-body force diagram
Reading graphs and charts
100
The formula for speed is:
S= d / t
speed = distance / time
100
The unit for acceleration
m/s2
meters per second squared
100
has magnitude (size) only
scalar quantity
100
What causes the force indicated by the X?
A. gravity
100
What quantity is represented by the slope of the graph?
Acceleration
200
m/s is the unit for measuring _______
speed / velocity
200
The formula for acceleration
a = v / t
a = Vf - Vi / t
200
has both magnitude and direction
vector quantity
200
The diagram below represents a 5.0-newton force and a 12-newton force acting on point P.
The resultant of the two forces has a magnitude of
13 N
200
What was the ball’s average speed during the time represented in the graph?
0.5 m/s
300
If the distance is 20 meters and the time is 5 seconds, what is the speed in m/s ?
4 m/s
300
The velocity of a 40 kg object increases from 20 m/s to 30 m/s in 2 seconds. What is the acceleration of the object during these 2 seconds?
5 m/s2
300
Which term identifies a scalar quantity?
(A) displacement (B) velocity
(C) acceleration (D) time
(D) time
300
A crate is being pulled along a floor by means of two ropes. A frictional force opposes the motion of the crate. The diagram below shows these three forces acting on the crate.
What is the magnitude of the net force acting on the crate?
800 N
300
Calculate the distance the marble travels during the first 3.0 seconds.
12m
4 m/s x 3 s = 12 m
400
A cyclist moves at a constant speed of 6 m/s. If the cyclist does not accelerate during the next 10 seconds, he will travel __
60 meters
400
A car accelerates at a constant rate from an initial velocity of 0 meters per second (m/s) to a final velocity of 32 meters per second (m/s) in 8 seconds (s). What is the car’s acceleration?
4 m/s2
400
Which terms both represent scalar quantities?
(A) displacement and velocity
(B) distance and speed
(C) displacement and speed
(D) distance and velocity
(B) distance and speed
400
Two forces, a 60.-newton force east and an 80.-newton force north, act concurrently on an object located at point P, as shown.
Determine the magnitude of the resultant force, R.
100 N
400
During which time interval was the student moving the fastest?
D
500
A 2.25 kg fish swims in a pond at a constant rate of 45 meters in 90 seconds. What is the fish’s approximate speed?
0.2 m/s
500
A car, initially traveling at 15 meters per second north, accelerates to 25 meters per second north in 5.0 seconds. The magnitude of the average acceleration is
2 m/s2
500
Scalar is to vector as
(A) speed is to velocity
(B) displacement is to distance
(C) displacement is to velocity
(D) speed is to distance
(A) speed is to velocity
500
The vector diagram below represents two forces, F1 and F2, simultaneously acting on an object.
Which vector best represents the resultant of the two forces?
500
A hobbyist collected data about the motion of a toy train on a straight track and then recorded the data in the graph below.
Which of these accurately describes the motion of the toy train?
A The toy train speeds up while going forward and then slows down.
B The toy train slows down while going forward and then moves backward.
C The toy train moves forward at a constant speed, slows down, and then stops.
D The toy train moves forward at an increasing speed, stops, and then moves forward.
C The toy train moves forward at a constant speed, slows down, and then stops.