Chapter 3 - Forces

Question 1

what is a force

Answer 1

a force is a push or a pull

Question 2

the S.I unit of force

Answer 2

newton ( n )

Question 3

what is a push

Answer 3

a push is a force when you exert an object further away from you ( eg. pushing a car )

Question 4

what is a pull

Answer 4

a pull is a force when you exert an object closer to you

Question 5

what are the 4 changes to the motion of an object when a force has occured

Answer 5

1. make a stationary object move
2. make a moving object stop
3. make the moving object slower or faster
4. change the direction of a moving object

Question 6

when there are 2 or more forces act on an object, we can….

Answer 6

calculate its net force ( textbook page 44 )

Question 7

if the net force is 0 we can say that ….

Answer 7

the object is balanced and there is no change in the motion

Question 8

what is the S.I unit of length

Answer 8

Meter ( M )

Question 9

How to convert cm to m

Answer 9

÷ 100

Question 10

How to convert m to cm

Answer 10

× 100

Question 11

How to convert m to km

Answer 11

÷ 1000

Question 12

How to convert km to m

Answer 12

× 1000

Question 13

What is the S.I unit of time

Answer 13

seconds ( s )

Question 14

how long is 1 minute ( in seconds )

Answer 14

60 seconds

Question 15

how long is 1 hour ( in minutes )

Answer 15

60 minutes

Question 16

how long is 1 hour ( in seconds )

Answer 16

3600 seconds

Question 17

what is speed

Answer 17

speed is the distance moved per minute

Question 18

what is the S.I unit for speed

Answer 18

meters per second ( m/s ) or kilometer per hour ( km/h )

Question 19

what is the formula for speed

Answer 19

distance ÷ time

Question 20

what is the formula for time

Answer 20

distance ÷ speed

Question 21

what is the formula for distance

Answer 21

speed × time

Question 22

what is the formula for average speed

Answer 22

total distance ÷ total time

Question 23

what happens if an object moves faster

Answer 23

it accelerates

Question 24

what happens if an object moves slower

Answer 24

it deaccelerates

Question 25

what is acceleration ?

Answer 25

it is the change of speed

Question 26

what is the S.I unit for acceleration

Answer 26

m / s2

Question 27

what is another unit for acceleration

Answer 27

km/h2

Question 28

what is the formula for acceleration

Answer 28

final speed - initial speed ÷ time taken ( seconds )

Question 29

when an object is at rest it will remain stationary unless...

Answer 29

a force acts onto it

Question 30

if the force is applied in the same direction as the motion

Answer 30

the object will move faster

Question 31

for example when we apply a force to push a door, it will turn its hinges this turning effect is called ....

Answer 31

the moment of force

Question 32

the moment of force has 2 factors one of them is,

Answer 32

the size of force : the larger the force , larger the moment

Question 33

the moment of force has 2 factors another one of them is

Answer 33

the perpendicular distance : larger the perpendicular distance, the larger the moment