forces and motion

Question 1

distance/time graph:
what does a decreasing slope mean?

Answer 1

decreasing speed

Question 2

distance/time graph:
what does an increasing slope mean?

Answer 2

increasing speed

Question 3

what is the speed equation?

Answer 3

speed =distance/ time

Question 4

what is speed?

Answer 4

distance per unit time

Question 5

what is velocity?

Answer 5

speed in a particular direction

Question 6

what is scalar?

Answer 6

something with magnitude (size)

Question 7

what is vector?

Answer 7

something with magnitude and direction

Question 8

when speed increases…
when speed decreases…

Answer 8

it is accelerating
it is deaccelerating

Question 9

examples of scalar
(5 points)

Answer 9

speed
mass
area
distance
time

Question 10

examples of vectors
(4 points)

Answer 10

velocity
forces
displacement
acceleration

Question 11

investigation motions practical 1:
equipment (3 items):

Answer 11

• stopwatch
• ruler
• object

Question 12

investigating motions:
method:
(6 points)

Answer 12

• measure height using tape
• drop object from measured height, this is the distance travelled
• using the stop clock, measure how long it takes object to find the distance
• record distance travelled and time taken
• use speed=distance/time equation
• repeat three times and find an average

Question 13

possible errors:
(2 points)

how to fix it:
(2 points)

Answer 13

• reading of measurement is incorrect (take at eye level)
• due to poor reaction time, stopwatch reading might be wrong

how to avoid:
- use electronic sensor for a more accurate measurement
- let go of the object, not with force

Question 14

in a distance/time graph…
which is by the x-axis?
by the y-axis?

Answer 14

y axis=distance
x axis=time