forces

Question 1

what is a force?

Answer 1

a push or pull exerted on an object

Question 2

what are the units for force?

Answer 2

N (newtons)

Question 3

what is newton’s first law?

Answer 3

an object at rest stays at rest and an object in motion stays in motion with the same speed and same direction unless acted upon by an unbalanced force

Question 4

what is newton’s second law?

Answer 4

force = mass x acceleration (an object will accelerate or change direction if acted upon by an unbalanced force)

Question 5

what is newton’s third law?

Answer 5

for every action force there is an equal and opposite reaction force

Question 6

what are 3 examples of contact forces?

Answer 6

friction, air resistance, tension

Question 7

what are 3 examples of non contact forces?

Answer 7

magnetic force, gravitational force, electrostatic force

Question 8

what is a resultant force?

Answer 8

the vector sum of all forces

Question 9

what is a scalar quantity?

Answer 9

a quantity with only magnitude

Question 10

what is acceleration?

Answer 10

a measure of how quickly velocity is changing

Question 11

what is air resistance?

Answer 11

the frictional force caused by air on a moving object

Question 12

what are 3 examples of vectors?

Answer 12

force, velocity, displacement

Question 13

what are 3 examples of scalars?

Answer 13

speed, distance, mass

Question 14

what is weight?

Answer 14

the force acting on an object due to gravity

Question 15

what is mass?

Answer 15

the amount of stuff in an object

Question 16

what is the equation for weight?

Answer 16

weight = mass x gravitational field strength

Question 17

what is earth’s gravitational field strength?

Answer 17

9.8N/kg

Question 18

what is the equation for moment?

Answer 18

moment = force x distance

Question 19

what is moment?

Answer 19

the turning effect of a force

Question 20

what is the equation for pressure?

Answer 20

pressure = force / area

Question 21

what is upthrust?

Answer 21

if force is equal to objects weight, it will float. if upthrust is less than weight the object will sink

Question 22

what is atmospheric pressure?

Answer 22

created on a surface by air molecules, decreases with height

Question 23

what is displacement?

Answer 23

a vector quantity, measures distance and direction in a straight line from A to B

Question 24

what is the walking speed?

Answer 24

1.5m/s

Question 25

what is the running speed?

Answer 25

3m/s

Question 26

what is the car speed?

Answer 26

25m/s

Question 27

what is the equation for acceleration?

Answer 27

acceleration = change in velocity/ time

Question 28

what does the distance time graph gradient do?

Answer 28

tells you the speed

Question 29

what does the velocity time graph gradient tell you?

Answer 29

the acceleration

Question 30

what is drag?

Answer 30

resistance in air or fluid

Question 31

what is terminal velocity?

Answer 31

the fast speed that an object can travel

Question 32

what is the resultant force equation?

Answer 32

resultant force = mass x acceleration

Question 33

what is inertia?

Answer 33

the tendency for motion to remain unchanged

Question 35

what is the equation for stopping distance?

Answer 35

stopping distance = thinking distance + breaking distance

Question 36

what are 4 thinking distance factors?

Answer 36

speed, reaction time, alcohol, drugs

Question 37

what are breaking distance factors?

Answer 37

speed, weather, tyre condition, brake quality

Question 38

what is the equation for momentum?

Answer 38

momentum = mass x velocity

Question 39

what is momentum measured in?

Answer 39

kg m/s

Question 40

what is velocity measured in?

Answer 40

m/s

Question 41

what is mass measured in?

Answer 41

kg

Question 42

is momentum a scalar or vector quantity?

Answer 42

vector

Question 43

what is the equation for change in momentum?

Answer 43

force = change in momentum/ change in time