Compound Measures Flashcards
What is the equation off speed?
Speed - distance / time
What is the equation for distance?
Distance = speed x time
What is the equation for time?
Time = distance / speed
Paul travels at 4m/s for 15 seconds. How far does he travel
D = s x t D = 4 x 15 D = 60meters
Mary travels 2.6km when traveling at 10m/s. How long does it take? (In hours
1000 meters = 1 km 2.6km=2600meters Time=distance/speed T=2600meters/10m/s T=260seconds =4mins 20 seconds =0.7(2recurring) hours
Glasgow to Liverpool is 548km. Susan drove from Glasgow to Liverpool at na average speed of 40km/hour. Work out the time in hours and minutes that the journey took.
T = d/s
348/40=8.7hours=8hours42minutes
What is the equation for density?
Density =mass /volume
What is the equation for mass?
Mass = density x volume
What is the equation for volume?
Volume = mass / density
What is an example of the units for density?
G/cm^3
What is an example of the units for mass?
Kg
What is an example of the units for volume?
Cm^3
The density of steel is 7700kg/m^3. A steel bar had a volume of 2.5m^3. Work out the mass of this bar.
M = d x v
=7700 x 2.5
=19250kg
The density of steel is 7700kg/m^3. A block of steel has a mass of 1540kg. Work out the volume of the block
V = m / d
=1540/7700
=0.2m^3
What is pressure?
The force of newtons applied over an area
What are the two units for pressure?
N/m^2 or N/cm^2
What is the equation for pressure?
Pressure = force / area
What is the equation for force?
Force = pressure x area
What is the equation for area?
Area = force / pressure
A force of 85 Newtons is applied to an area of 1.5m^2. Work out the pressure in N/m^2
P = f/a
P = 35/1.5
=23.(3recurring) n/m^2
A free is applied to an area of 4.5m^2. It produces pressure of 12N/m^2. Work out the force in Newtons
F = p x a
=12 x 4.5
=54N
A box exerts a force of 120N onto a table. The pressure on the table is 50N/m^2. Calculate the area of the box in contact with the table
A = f/p
A=120/50
=2.4n/m^2
1 meter = ? Cm
100cm
1m^2 =? Cm^2
100^2cm^2
=10000cm^2
1m^3 =? cm^3
100^3cm^3
= 1000000cm^3
Convert 4m^2 into cm^2
4 x 100^2
=4x10000
=40000cm^2
700000cm^3 into m^3
700000 / 100^3
=700000 / 1000000
=0.7m^3
A force of 35Newtons is applied to an area of 1.5m^2. Work out the pressure in N/cm^2
1.5m
=1.5x100^2
=15000cm^2
P = f/a
P= 35/15000
=0.0023n/cm^2
A force is applied to an area of 3.5m^2. It produces pressure of 15n/cm^2. Work out the force in Newtons
3.5m^2=35000cm^3
F=P x a
=15 x 35000
=525000N
Meters^2 –> cm^2 = ? = ?
= x100^2 = 10000
Cm^2 –> meters^2 = ? = ?
= divided by 100^2 = 10000
