Section 1: Forces and Motion Flashcards Preview

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Flashcards in Section 1: Forces and Motion Deck (24)
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1

What does the gradient on a distance-time graph tell you

the speed

2

what does a flat section on a d-t graph tell you about the objects movements

it has stopped

3

what does the gradient on a speed-time graph tell you

acceleration

4

mass is measured in... using a...

g/kg etc. measured using a mass balance/scales

5

weight is measured in... using a ...

Newtons (N) using a spring balance or a newton meter

6

which is a force: mass or weight?

weight

7

In what direction does the reaction force act? and which forces does it act against?

acts straight upwards, counter-acting the force of gravity/weight

8

HOW CA YOU REDUCE FRICTION between solid surfaces?

by putting a lubricant eg. oil/grease between the surfaces.

9

How can you reduce resistance/drag from fluids? (liquids/gases)

streamlining the object

10

what happens to the frction as the seed increases?

it increases

11

What factors could affect the motion of a toy car on a ramp? (4)

1. Mass
2. friction- is the surface a rug or a wooden plank?
3. acceleration due to gravity- higher/lower up the ramp
4. angle of ramp

12

objects reach terminal velocity when which forces are equal?

accelerating force and resistance.

13

terminal velocity of a falling object depends on its...(2)

shape and area

14

affect of n increased surface area on drag?

increased drag

15

affect of increased drag on terminal velocity?

decreased

16

affect of bigger mass on acceleration?

smaller acceleration

17

affect of bigger force on acceleration/deceleration?

greate

18

what do vectors represent? (2)

Size and direction

19

What do scalar quantities represent? (1)

Size

20

Examples of physical quantities that are vector quantities? (4)

any from force/velocity/displacement/acceleration/momentum

21

How (roughly) do you work out resultant force?

by combining vectors

22

which factors affect total stopping distance? (2)

thinking distance and braking distance

23

Which factors affect thinking distance? (2)

Speed and how dopey you are e.g tiredness, drugs, alcohol, old age, inexperience

24

Which factors affect braking distance? (4)

Speed, mass of vehicle, how good the brakes are, how good the grip is eg. road surface/weather/tyres