Formulae
Units
Graphs
Forces
Calculations
100
Complete this; F = m x ___
a
100
What is the way we write m/s in science?
ms-1
100
What are the 2 types of _____ / time graphs?
distance - time and speed - time
100
What 2 forces are acting on a parked car?
Reaction & weight
100
How much work is done dragging a table with a force of 50N for 5 metres?
250 J
200
What is word done equal to?
Force x distance moved
200
What is acceleration normally measured in?
ms-2
200
In a distance-time graph, what does a steep sloping straight line mean?
Fast speed
200
What 2 forces are acting on a parachutist?
Drag/air resistance & weight
200
How far does a car travel in 4 hours at a speed of 80 km h-1
320 km
300
What is given by m x g x h?
Ep
300
What is weight measured in?
N
300
In a distance-time graph what is shown by a horizontal line?
Object is stopped / at rest / stationary
300
If the forces acting on an object are unbalanced, what will happen to the object?
It will accelerate or decelerate
300
A snake slithers up a giant sand dune at 2 ms-1.
How far will it have moved in a minute?
120 m
400
What two formulae tell you how much work has been done or how much energy is gained when an object is lifted UP?
Work = force x distance
Ep = m g h
400
What are the units for g?
ms-2
400
In a speed - time graph, what does a straight downward sloping line mean?
Constant deceleration
400
A child is sitting on a swing (stationary). What 2 forces are operating?
Weight & tension
400
A ball is dropped off the top of a building. It reaches 30 ms-1 after 3 seconds. What was its acceleration?
10 ms-2
500
What is the relationship between a falling ball & the kinetic energy it has just before it hits the ground?
g h = 1/2 v 2
500
What other units are used for power other than W?
Js-1
500
What is given by the area under a speed - time graph?
The total distance travelled
500
For a plane to climb (go up to a higher altitude) which forces must be unbalanced?
Lift (upthrust) and weight
500
A girl diving from a 15 m platform wishes to know how fast she enters the water. She is in the air for 1.75 s and dives from rest (with an initial speed of zero). What can you tell her about her entry speed?
As she dives from rest, her final speed must be twice this average (if we assume that she accelerates uniformly). So, her speed on entry is
17.14 ms-1