physics 2a- motion, energy and electricity

Question 1

what force attracts all masses?

Answer 1

gravity

Question 2

what is gravitational force?

Answer 2

the force of attraction between all masses

Question 3

what is mass?

Answer 3

the amount of stuff in an object

Question 4

what is weight caused by?

Answer 4

the pull of the gravitational force

Question 5

which one changes? mass or weight

Answer 5

weight

Question 6

what is weight measured in?

Answer 6

newtons (n)

Question 7

what is a resultant force?

Answer 7

an overall force on an object

Question 8

what does the overall effect of the force do?

Answer 8

decides the motion of the object (whether it accelerates, decelerates or stays at steady speed)

Question 9

how is the overall effect found?

Answer 9

by adding or subtracting them

Question 10

which direction does gravity act upon?

Answer 10

downwards

Question 11

resultant force is a change in…

Answer 11

velocity

Question 12

what does friction do?

Answer 12

slows things down

Question 13

what does air resistance do?

Answer 13

causes things to fall at different speeds

Question 14

what does the frictional force depend on?

Answer 14

shape and area

Question 15

what is a safe speed to hit the ground?

Answer 15

15mph

Question 16

what is stopping distance?

Answer 16

thinking distance+braking distance

Question 17

what is thinking distance?

Answer 17

the distance the vehicle travels during the drivers reaction time

Question 18

what is braking distance?

Answer 18

the distant the car travels under the braking force

Question 19

two main factors that affect thinking distance:

Answer 19

how fast you’re going

how dopey you are

Question 20

four main factors that affect braking distance:

Answer 20

how fast you’re going
how good your brakes are
how good the tyres are
how good the grip is