L1: forces and motion

Question 1

What do we use to measure forces?

Answer 1

newton meter

Question 2

what is the unit of force?

Answer 2

newtons

Question 3

what is the other name for the force of gravity?

Answer 3

weight

Question 4

what is the difference between contact and non contact forces?

Answer 4

you need to make contact for contact forces to work where non contact forces you don’t

Question 5

What is upthrust?

Answer 5

when water makes things float

Question 6

what is thrust?

Answer 6

forward push like a car or plane

Question 7

what is lift?

Answer 7

when things are going upwards like air pushing a plane upwards

Question 8

what is air resistance?

Answer 8

air slowing things down

Question 9

What is weight?

Answer 9

gravity pulling things down

Question 10

What is magnetic?

Answer 10

magnets attracting or repelling

Question 11

What is reaction?

Answer 11

contact force between surfaces

Question 12

What is elastic?

Answer 12

an object which can be squashed or stretched and still go back to its original form

Question 13

what is friction?

Answer 13

when things slow down because to surfaces are rubbing together

Question 14

do forces have a size and direction?

Answer 14

yes

Question 15

how can we represent a force?

Answer 15

by drawing and arrow

Question 16

what does a longer arrow mean when drawing forces?

Answer 16

a bigger force

Question 17

what does the direction of the arrow show about the force?

Answer 17

the direction of the force

Question 18

what is a balanced force?

Answer 18

if two forces are equal and opposite, it also means that the resultant force is 0

Question 19

what happens if the forces are balanced but the objects were already moving?

Answer 19

that means the objects are at a constant speed, if it was still, it means it is still

Question 20

what is an unbalanced force?

Answer 20

if two forces are unequal and opposite, this also means that the resultant force will be above 0N

Question 21

what happens when two forces are unbalanced?

Answer 21

the speed of an object will either accelerate, decelerate or change direction