Flashcards in Section 1: Forces and Motion Deck (24)
What does the gradient on a distance-time graph tell you
what does a flat section on a d-t graph tell you about the objects movements
it has stopped
what does the gradient on a speed-time graph tell you
mass is measured in... using a...
g/kg etc. measured using a mass balance/scales
weight is measured in... using a ...
Newtons (N) using a spring balance or a newton meter
which is a force: mass or weight?
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
HOW CA YOU REDUCE FRICTION between solid surfaces?
by putting a lubricant eg. oil/grease between the surfaces.
How can you reduce resistance/drag from fluids? (liquids/gases)
streamlining the object
what happens to the frction as the seed increases?
What factors could affect the motion of a toy car on a ramp? (4)
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
objects reach terminal velocity when which forces are equal?
accelerating force and resistance.
terminal velocity of a falling object depends on its...(2)
shape and area
affect of n increased surface area on drag?
affect of increased drag on terminal velocity?
affect of bigger mass on acceleration?
affect of bigger force on acceleration/deceleration?
what do vectors represent? (2)
Size and direction
What do scalar quantities represent? (1)
Examples of physical quantities that are vector quantities? (4)
any from force/velocity/displacement/acceleration/momentum
How (roughly) do you work out resultant force?
by combining vectors
which factors affect total stopping distance? (2)
thinking distance and braking distance
Which factors affect thinking distance? (2)
Speed and how dopey you are e.g tiredness, drugs, alcohol, old age, inexperience