Motion

Question 1

Scalar

Answer 1

Is a physical quantity which has a size only

Question 2

Vector

Answer 2

A physical quantity which has a size and a direction

Question 3

Scalar examples

Answer 3

Mass
Density
Speed
Distance
Energy

Question 4

Vector examples

Answer 4

Weight
Pressure
Force
Velocity
Acceleration
Displacement and time

Question 5

What is the difference between scalar and vector

Answer 5

A vector has a direction and a size, whereas a scalar only has a size

Question 6

Displacement
What would be if something does a full loop

Answer 6

0

Question 7

Distance

Answer 7

How far an object has travelled

Question 8

Displacement

Answer 8

How far an object has travelled in a certain direction

Question 9

Speed equation
Definition

Answer 9

S= d
—
T
S= m/s
D= m
T= s
Rate of change of distance

Question 10

Average speed

Answer 10

(Inital speed + final speed)
—————————————-
2

Question 11

How the average speed of an object moving down a runway depends on the slope of the runway method

Answer 11

Measure the length of the slope sing a metre ruler clearly making the start and finish line
Adjust the position o the runway so that the ball bearing is a vertical height of 10cm above the deck
Release the ball bearing and, using a stopclock, measure the time for the ball to travel the length of the slope
Record your results in a table
Repeat this measurement and find an average
Repeat this process for slope heights of 20cm, 30cm, 40cm and 50cm
Calculate the average speed for each slope height
Draw a graph of average speed (y axis) against height of the slope (x axis)

Question 12

Describe relationship ( slope method )

Answer 12

As the height of the slope increases, the speed of the ball bearing increases

Question 13

How to ensure the results were reliable

Answer 13

Repeated measurements for the time taken at each height
Calculate an average time

Question 14

What is the main source of inaccuracy in your readings

Answer 14

Difficult to measure the height of the slope, when clamped to the retort stand
Error in timing due to reaction time of person with stopclock

Question 15

How could you improve the accuracy of the experiment

Answer 15

Find an alternative method of setting the height of slope
Repeat time to travel along the slope move than twice for each height

Question 16

Rate of change of speed

Answer 16

Final speed - initial speed
————————————
Time
Scalar
M/s2

Question 17

Average velocity

Answer 17

Displacement
——————-
Time
M/s
Vector version
Rate of change of displacement

Question 18

Average velocity (2)

Answer 18

(Initial velocity + final velocity)
——————————————
2

Question 19

Acceleration

Answer 19

A= (v-u)
——-
T
A= m/s2
V/u= m/s
T = s
Vector

Question 20

What does negative number mean for
Velocity
Acceleration

Answer 20

V= different direction
A = deceleration ( don’t have to show - )

Question 21

Distance / time graph
Straight line ?
/ line
Gradients?
What does gradient mean?

Answer 21

—= stationary g= 0
/= moving at a constant speed g = constant positive
Gradient = speed

Question 22

Displacement/time graphs
— graphs
/ graphs
\ graphs
Gradient on graphs is
Gradient means

Answer 22

—= stationary g= 0
/= moving at a constant speed g= constant positive
= moving at a constant velocity in the opposite direction than before g= negative constant

Question 23

Speed/time graphs
Area under graph ? (———-) and (///////)
(////////////)
(————-)

Answer 23

L x b = distance
1/2 l x b = distance
(L x b) + (1/2 l x b) = distance

Question 24

Speed/time graphs
Overall gradient ?
Overall area under graph ?
/ graph
— graph
\ graph
Gradient =

Answer 24

O g = rate of change of speed
O area under graph = distance travelled
/= increasing speed
—= constant speed
=decreasing speed

Question 25

Velocity/time graph
— graphs
/ graphs
\ graphs
Gradient ?
Area under graph ?

Answer 25

—= constant velocity
/= acceleration
= deceleration
Gradient = acceleration
Area under graph = displacement