P2.1 FORCES

Question 1

what is the speed of an object?

Answer 1

the distance it travels in a unit of time

Question 2

what is the equation for speed?

Answer 2

distance/time

Question 3

what is the equation for distance?

Answer 3

speed x time

Question 4

what is the equation for time?

Answer 4

distance/speed

Question 5

what is the speed when the distance is 250 m and the time is 40s?

Answer 5

d/t = 250/40=6.25m/s

Question 6

what is the distance when the time is 200s and the speed is 18m?

Answer 6

TxS=200x18=3600m

Question 7

what is the time when the speed is 42m/s and the distance is 680m?

Answer 7

d/s=680/42=16.2s

Question 8

what is instantaneous speed?

Answer 8

the speed of an object is travelling at at that exact moment

Question 9

how is average speed calculated?

Answer 9

by using the total distance and total time

Question 10

when is average and instantaneous speed the same?

Answer 10

when an object is travelling at a constant speed

Question 11

what is the average speed for a 70m journey in 28s?

Answer 11

d/t=70/28=2.5m/s

Question 12

what is the instantaneous speed at 5s for a distance of 10m?

Answer 12

d/t=10/5=2m/s

Question 13

what equipment do you need to calculate the speed of a ball rolling slowly down a ramp?

Answer 13

meter ruler(d)
stop clock(t)

Question 14

what equipment do you need to calculate the speed of a dog running down a 50m path?

Answer 14

tape measure(d)
stop clock(t)

Question 15

what equipment do you need to calculate the speed of a tennis ball falling of a deck?

Answer 15

metre ruler(d)
light gate(t)

Question 16

what equipment do you need to calculate the speed of a plane flying from London to Paris?

Answer 16

satellite(d)
stop clock(t)

Question 17

how many metres does 1 mile equal?

Answer 17

16000m

Question 18

what are scalars?

Answer 18

quantities only measured with numbers

Question 19

what are vectors?

Answer 19

quantities measured with direction and a magnitude

Question 20

what are examples of scalars?

Answer 20

time
speed
temperature
distance

Question 21

what are examples of vectors?

Answer 21

displacement
velocity
acceleration

Question 22

what is velocity?

Answer 22

the speed in a specific direction

Question 23

what is the equation for velocity?

Answer 23

displacement/time

Question 24

what is the equation for displacement?

Answer 24

velocityXtime

Question 25

what is the equation for 'time'?

Answer 25

displacement/velocity

Question 26

what is relative velocity?

Answer 26

the difference in velocities between two objects

Question 27

what is displacement?

Answer 27

the change in position of an object

Question 28

how do you calculate average speed?

Answer 28

initial speed+ final speed/2

Question 29

what is acceleration?

Answer 29

the change of velocity in a given time

Question 30

what is the equation for acceleration?

Answer 30

change in velocity/time

Question 31

what is the equation for change in velocity?

Answer 31

time x acceleration

Question 32

what is the equation for "time" ?

Answer 32

change in velocity/acceleration

Question 33

how can a change in any variable be worked out?

Answer 33

final value minus initial value

Question 34

what is the equation for final velocity?

Answer 34

acceleration x time + initial velocity

Question 35

what is the equation for initial velocity?

Answer 35

final velocity-acceleration x time

Question 36

why does the velocity change even though the speed is constant?

Answer 36

because the direction is changing and velocity is a vector