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24 questions
formula for acceleration
a=t(v+u)
a=t(v−u)
a=(v−u)×t
formula for speed
s = d x t
s = d / t
s = t / d
How to find distance from speed-time graph?
distance = area under graph
distance = gradient of graph
formula for resultant force
F = ma
F = m / a
F = a / m
S.I. unit of mass
g
kg
S.I. unit of time
s
min
h
formula for weight
W = mg
W = m / g
W = g / m
formula for density
d = mv
d = m / v
d = v / m
S.I. unit of weight
g
kg
N
formula for moment
M = F x d
M = F / d
M = d / F
To find moment, what kind of d must the d be?
distance travelled in the same direction as the force
perpendicular distance from the pivot to the line of action of force
Which formula MUST we write when doing this question?
WD = F x d
M = F x d
sum of ACWM = sum of CWM
d = m / v
formula for pressure
P = F x A
P = F / A
P = A / F
For formula of pressure, what does the A stand for?
acceleration
contact area
surface area
cross-sectional area
For this question, which formula should be used?
F = ma
P = F / A
d = m / v
For this question, what is the F needed for the formula of pressure?
96 kg
960 N
For this question, what is the A needed for the formula of pressure?
2.5 m x 2.0 m
2.0 m x 0.8 m
2.5 m x 0.8 m
2.5 m x 2.0 m x 0.8 m
Which concept is applied when solving questions on hydraulic device?
sum of ACWM = sum of CWM
pressure on piston K = pressure on piston L
GPE lost = KE gained
KE lost = GPE gained
formula for GPE
21mv
21mv2
mgh
F×d
formula for KE
21mv
21mv2
mgh
F×d
formula for work done
\frac{1}{2}mv^221mv2
mghmgh
F\times dF×d
tE
formula for power
P = F / A
P = F x A
P = E x t
P = E / t
When finding power (P = E/t), which of the following can be used as E?
work done
GPE
KE
Weight is a force.
True or false?
True
False
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