Topic five - forces Flashcards Preview

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Flashcards in Topic five - forces Deck (17):
1

what is the difference between vectors and scalar quantities

vectors have a direction in association with them whereas scalar quantities do not

2

what are the two types of forces

contact and non-contact

3

how do you work out the distance from the pivot if you are not applying the force perpendicular to it.

you work out the perpendicular distance from the pivot i.e. continue along with the force until it is 90 degrees to the distance

4

how do you work out the pascals

newtons per metre squared

5

how do you work out the pressure in a liquid

the height of the column of liquid x the density of the liquid x the gravitational field strength

6

how do you work out the upthrust in water

the mass of the displaced water.

7

what is a typical walking speed

1.5 m/s

8

what is a typical running speed

3 m/s

9

what is a typical cycling speed

6 m/s

10

what is a typical car speed

25 m/s

11

what is a typical train speed

55 m/s

12

what is a typical plane speed

250 m/s

13

what is newton's first law of motion

if the resultant force on a stationary object is zero, the object will remain stationary. if the resultant force on a moving object is zero, it will just carry on moving at the same velocity.

14

what is newton's second law of motion

the acceleration of an object as produced by a net force is directly proportional to the magnitude of the force and inversely proportional to the mass.

15

what is newton's third law of motion

when two objects interact, the forces they exert on each other are equal and opposite.

16

what two main factors affect thinking distance

speed and your reaction time

17

what four main factors affect braking distance

speed, road surface, tire condition, and brake condition