forces (paper 2)

Question 1

define a vector quantity

Answer 1

physical quantity that has magnitude and direction

Question 2

define a scalar quantity

Answer 2

physical quantity that has magnitude but no direction

Question 3

list 5 vector quantities

Answer 3

force
velocity
displacement
acceleration
momentum

Question 4

list 5 scalar quantities

Answer 4

speed
distance
mass
temperature
time

Question 5

define a force

Answer 5

a push or pull on an object that is caused by it interacting with something

Question 6

forces can change an objects? What?

Answer 6

shape
motion

Question 7

define contact forces

Answer 7

where the two objects must touch each other

Question 8

define non contact forces

Answer 8

where the objects dont need to touch

Question 9

what is the resultant force

Answer 9

single force that has the same effect as all the forces acting on an object

Question 10

what is the moment of a force?

Answer 10

a measure of the turning effect of the force on an object

Question 11

define the centre of mass

Answer 11

the point which its mass can be thought of as being concentrated

Question 12

what happens when an object is freely suspended

Answer 12

it comes to rest with its centre of mass directly underneath the point of suspension

Question 13

what effect does a low gear give?

Answer 13

low speed high turning force

Question 14

what effect does a high gear give

Answer 14

high speed low turning effect

Question 15

what velocity does an object have at rest

Answer 15

zero

Question 16

define acceleration

Answer 16

the rate of change of velocity

Question 17

what is the resultant force

Answer 17

single force that has the same effect as all the forces acting on an object

Question 18

define mass

Answer 18

quantity of matter in an object

Question 19

define weight

Answer 19

force acting on an object due to gravity

Question 20

define the terminal velocity of an object

Answer 20

when an object reaches a constant velocity due to its weight being equal to the frictional forces on it

Question 21

give 3 thinking distance examples

Answer 21

alcohol/drugs
mobile phone
tiredness

Question 22

give 3 braking distance examples

Answer 22

worn brakes
worn tyres
icy road

Question 23

give 1 stopping distance example

Answer 23

speed

Question 24

v=?

Answer 24

final velocity

Question 25

u=?

Answer 25

initial velocity

Question 26

a=?

Answer 26

acceleration

Question 27

s=?

Answer 27

distance travelled

Question 28

how can you tell if an objects elastic?

Answer 28

returns to its original shape when the forces deforming it are removed

Question 29

what does Hookes law state?

Answer 29

extension of a spring is directly proportional to the force applied as long as its limit of proportionality is not exceeded

Question 30

how many joules 0f work does 1 Nm equal

Answer 30

1 joule