L2: friction

Question 1

what is friction?

Answer 1

it always slows moving objects down, it opposes motion

Question 2

when is friction created?

Answer 2

whenever two touching objects or surfaces rub past each other

Question 3

what do we call it when friction occurs in air?

Answer 3

air resistance

Question 4

what do we call it when friction occurs in water?

Answer 4

water resistance

Question 5

what is an independent variable and where does it go on a table?

Answer 5

this is the variable that you change and it goes on the left

Question 6

what is a dependent variable and where does it go on a table?

Answer 6

this is the variable that is measured and it goes on the right

Question 7

what would the dependent variable be when a scientist measures the mass of different species of frogs on a weighing scale?

Answer 7

mass (g)

Question 8

What is the thinking distance when driving a car?

Answer 8

the distance a car travels before the brakes apply

Question 9

what is the braking distance when driving a car?

Answer 9

the distance a car travels whilst it is braking

Question 10

what is the stopping distance when driving a car?

Answer 10

the sum of the thinking distance and the braking distance

Question 11

what comes first, the thinking distance or the braking distance?

Answer 11

the thinking distance

Question 12

what is important during the braking distance?

Answer 12

having as much friction as possible so that the car doesn’t skid

Question 13

can you name a few things that the friction between the tyres and road is affected by (factor affecting braking distance)?

Answer 13

inflation pressure of tyres, road surface and weather (ice, etc), quality of brakes, speed of car

Question 14

can you name a few things that the friction between the tyres and road is affected by (factor affecting thinking distance)?

Answer 14

drugs and alcohol, tiredness, medication