motion

Question 1

What is a physical quantity?

Answer 1

Something that can be measured

Question 2

typical walking speed (m/s)

Answer 2

1.5

Question 3

typical running speed (m/s)

Answer 3

3

Question 4

typical cycling speed (m/s)

Answer 4

6

Question 5

typical car speed (m/s)

Answer 5

13-30

Question 6

typical train speed (m/s)

Answer 6

50

Question 7

typical plane speed (m/s)

Answer 7

250

Question 8

acceleration= (velocity + time one)

Answer 8

a = v-u/t

Question 9

speed units

Answer 9

m/s

Question 10

distance units

Answer 10

m

Question 11

time units

Answer 11

s

Question 12

acceleration units

Answer 12

m/s^2

Question 13

how to find distance travelled on velocity time graph

Answer 13

find area beneath line

Question 14

equation for a, x, v + u

Answer 14

v^2-u^2=2ax

Question 15

What quantity is the rate of change of velocity?

Answer 15

acceleration

Question 16

How is speed found from a distance-time graph?

Answer 16

gradient

Question 17

How is acceleration found from a velocity-time graph?

Answer 17

It is the gradient of the line

Question 18

Newton’s first law

Answer 18

an object remains in the same state of motion unless a
resultant force acts on it

Question 19

Newton’s second law

Answer 19

the acceleration of an object is directly related to the net force and inversely related to its mass

Question 20

equation with f, m + a

Answer 20

f=ma

Question 21

Inertial mass

Answer 21

the ratio of force over acceleration is called
inertial mass, inertial mass is a measure of how difficult it is to change the velocity of an object

Question 22

Newton’s third law

Answer 22

every action has an equal and opposite reaction

Question 23

equation with W, m, g

Answer 23

W=mg

Question 24

weight units

Answer 24

N

Question 25

mass units

Answer 25

kg

Question 26

gravitational field strength units

Answer 26

N/kg

Question 27

What word describes the forces on an object moving at a constant speed?

Answer 27

balanced

Question 28

equation with p, v + m

Answer 28

p=mv

Question 29

momentum (p) units

Answer 29

kgm/s

Question 30

velocity units

Answer 30

m/s

Question 31

Conservation of momentum

Answer 31

In a closed system, total momentum before an event = total momentum after the event

Question 32

Calculating the rate of change of momentum

Answer 32

combine two equations: f = m x change v/t = change p/t so F = mv-mu/t

Question 33

Car safety features

Answer 33

-Crumple zones -airbag -seatbelt

Question 34

equation with force, change in momentum + time

Answer 34

F=mv-mu/t

Question 35

stopping distance =

Answer 35

thinking distance + braking distanc

Question 36

reaction time can be affected by:

Answer 36

tiredness drugs alcohol distractions

Question 37

the braking distance of a vehicle can be increased by:

Answer 37

-poor road and weather conditions, such as gravel, or wet or icy roads - less friction between tyres and the road -poor vehicle conditions, such as worn brakes or worn tyres - less friction between brakes and wheels -more mass in the vehicle (extra passengers for example) - the braking friction has to work for a greater distance to remove the larger kinetic energy

Question 38

equation used to calculate braking distance

Answer 38

Fd = 1/2mv^2

Question 39

Why would taking on more passengers increase a car’s stopping distance?

Answer 39

Greater mass means there is more kinetic energy for the brakes to transfer