Moments
turning effect
A simple machine is a device which alters:
the size of a force or
the _____in which a force acts.
Direction
What is the formula for calculating work done?
Calculate the force applied to a spring that stretches 0.25m and has a spring constant of 16N/m.
F = k x e
F = 16 x 0.25
F = 4N
A wedge, a pulley, and a lever are all examples of......
simple machines
When a see saw is in balance, what can be said aboutthe clockwise and anticlockwise moments?
They are equal
Complete the sentence below:
Wedges and screws changes the ………………….. of a force
DIRECTION
What units is work done measured in?
Joules
What is ELASTIC DEFORMATION
objects which will return to their original shape one the force is removed.
What is "k" in the following formula?
k=f x e
spring constant
What are 2 ways to increase the moment?
increase force or perpendicular distance
Pulley
lever
wheel and axle
wedge
screw
Inclined plane
A car is dragged 4.7 m over flat ground. It is pulled by a force of 250N. What is the work done?
1175 J
Which store is filled when the boy bounces downon the trampoline?
As he bounces up, Where is the energy transferred to?
Elastic potential store
Kinetic store
What are the units of distance in the work done formula?
m
the point about which a leverc an turn is called ____
a pivot
If you use an inclined plane, the distance is longer, but it takes less _______________.
Force
I lift a 20kg weight over my head to a height 2 meters. How much work have I done on the weight?
400 J
direct relationship
What is a pivot?
The point around which a lever turns
Calculate the turning force (moment) of awheelbarrow that has an arm that is 1.5m longwhen a force of 55N is applied.
82.5Nm
ramp!
What is the definition of Work Done
Work done is the amount of energy transferred when aforce causes something to be displaced (move).
Why would anyone need to know a SPRING CONSTANT?
Why do different springs stretch different amounts for the same force?
they have different spring constants