Vectors and Scalars, Motion in one direction.

Question 1

What is the definition of a Scalar quantity?

Answer 1

Physical quantity that has magnitude. (size)

Question 2

What is the definition of a Vector quantity?

Answer 2

Physical quantity with both magnitude and direction.

Question 3

How do we indicate a Vector quantity?

Answer 3

With an arrow above the letter. Or in bold.

Question 4

What do we need to draw a Vector?

Answer 4

Scale.
Arrow the correct length.
Direction labelled positive or negative, North or 360 degrees. 
Arrow head.
Write the magnitude of the vector.

Question 5

What is the final Vector called when adding or subtracting Vectors?

Answer 5

The resultant vector. From the tail of the first vector to the head of the second vector.

Question 6

Which graphical representation of the below vectors has the greater magnitude?
A ——)
B ————)
What is the difference between the below vectors?
A (——–
B ——–)

Answer 6

B, because the arrow is longer. But both A and B are pointing in the same direction.

Both A and B have the same magnitude but are pointing in different directions.

Question 7

Fill in the missing words:
The direction of a vector must be made with respect to a particular —————- —- ————. This is the point of view from which a system is observed.

Answer 7

Frame of reference.

Question 8

Term for this definition:

When two vectors have equal magnitude and direction.

Answer 8

Vector Equality.

Question 9

What are the three features of motion that we use to describe how an object moves.

Answer 9

Position/Displacement: Tells us about the objects location or change thereof.
Speed/Velocity: Tells us how fast the object is moving and for velocity where to.
Acceleration: Tells us how fast the objects speed and velocity is changing.

Question 10

What occurs when an object changes it’s position?

Answer 10

Motion.

Question 11

Term for this definition:

The measurement of location of an object defined relative to a reference point.

Answer 11

Position.

Question 12

What is the definition of distance?

Is it a Vector or Scalar?

Answer 12

The actual path length that an object has moved from it’s initial position to it’s final position.
Scalar.

Question 13

What is the definition of displacement?

Is it a Vector or Scalar?

Answer 13

The change in an objects position.

Vector.

Question 14

What are the three differences between Distance and Displacement?

Answer 14

Distance: Displacement
> Path dependent < Path independent
> Scalar < Vector
> Always positive < Can be positive or
negative.

Question 15

What is the definition of speed?

What is the definition of velocity?

Answer 15

S: The rate of change of path length with respect to time.
V: The rate of change of position with respect to time.

Question 16

Equations for Savg and Vavg?

Unit for both: m.s^-1

Answer 16

S(average) [SCALAR]
= distance travelled over time taken. or
= change in path length over time taken

V(average) [VECTOR]
= change in position over time taken
or
= displacement over time taken

Question 17

How fast an object is moving at a particular moment.

Answer 17

Instantaneous speed /

Instantaneous velocity

Question 18

When ———– changes Acceleration exists.

Answer 18

Velocity

Question 19

T/F
Acceleration is a vector.
There’s no acceleration if constant speed around a corner.

Answer 19

True
False, there is. Because acceleration is a vector. ( Magnitude and direction) The direction changes so there is acceleration.

Question 20

Is there acceleration when?

a) Constant speed in a straight line.
b) Constant speed and turns a corner.
c) Braking before a stop street.

Answer 20

a) No
b) Yes, change of direction
c) Yes, magnitude changes

Question 21

What are the three types of motion?

Answer 21

Stationery objects.
Uniform/Constant motion.
Motion at a constant acceleration.

Question 22

What are the three graphs to graphically represent motion.

Answer 22

Position vs time.
Velocity vs time.
Acceleration vs time.

Question 23

To go from Acceleration vs time to Velocity vs time. By?

Answer 23

Multiplying a x delta t.

Question 24

What are the labels for this symbol?
-)x
A-)x
-)Vi
-)Vf
-)Vavg
-)a
t
At

Answer 24

Position
Displacement
Initial Velocity
Final Velocity
Average Velocity
Acceleration
time 
time interval

Question 25

What is the equation for?
Displacement
Average speed
Average velocity
Average acceleration

Answer 25

A-)x =Xf-Xi
avgs = d/At
-)Vavg = A-)x / At
-)aavg = A-)V / At

Question 26

What are these equations?
-)Vf = -)Vi + [ -)a x At ]
A-)x = [ V-)i + V-)f / 2 ] x At
A-)x = V-)i x At + 1/2-)a x At^2
V-)f^2 = V-)i^2 + 2-)a x Ax

Answer 26

Equations of Motion

Question 27

In graphs of motion:
For stationary objects, motion at constant velocity and uniform acceleration;
What are the trends?

Answer 27

Stationary: Velocity and Acceleration vs time will always be 0. Position vs time a straight line.

Constant motion: Acceleration vs time will always be zero. Velocity vs time a straight line. Position vs time diagonal straight line.

Uniform acceleration: Acceleration vs time straight line. Velocity vs time diagonal straight line. Position vs time curved diagonal line.