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Physics 1
Mechanics and materials
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Created by
Carys Barron
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Cards (99)
What do scalars describe?
Only a
magnitude
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What do vectors describe?
Magnitude
and direction
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What are examples of scalars and vectors?
Scalars
:
Distance
Speed
Mass
Temperature
Vectors
:
Displacement
Velocity
Force/Weight
Acceleration
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When should you use calculation to add vectors?
When the two vectors are
perpendicular
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How do you find the resultant force of two perpendicular forces of 5 N and 12 N?
Use
Pythagoras' theorem
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What is the resultant vector (R) when two forces of 5 N and 12 N are perpendicular?
13 N
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How do you find the direction of the resultant vector?
Use
trigonometry
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What is the formula for finding the angle θ in a right triangle?
tan θ
=
opposite
/adjacent
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What is the direction of the resultant force from the horizontal in the example given?
22.6°
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When should you use a scale drawing to add vectors?
When vectors are at angles other than
90°
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How do you find the magnitude and direction of a ship's displacement traveling at a bearing of 060°?
Draw
a
scale
diagram
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What is the formula to resolve a vector V into its components x and y?
x = V
cos
θ, y = V
sin
θ
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What does it mean to resolve vectors?
To break them into
components
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How do you find the vertical component of a velocity of 10 m/s at an angle of 30°?
y = 10
sin
30°
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How do you find the horizontal component of a velocity of 10 m/s at an angle of 30°?
x = 10
cos
30°
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What are the vertical and horizontal components of a ball fired at 10 m/s at 30°?
8.7 m/s
and
5 m/s
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How do you find the vertical and horizontal components of weight on an inclined plane?
Use
sin
and
cos
for angles
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What is the condition for an object to be in equilibrium?
The sum of all
forces
must be zero
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How can you show an object is in equilibrium?
Add horizontal and vertical components of
forces
Draw a scale diagram forming a
closed triangle
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What is the formula for the moment of a force about a point?
Moment = Force ×
Perpendicular
distance
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What is a couple in physics?
A pair of equal and opposite
forces
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How do you find the moment of a couple?
Multiply one
force
by the distance
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What does the principle of moments state?
Sum of
anticlockwise
moments equals clockwise moments
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How do you find the value of F using moments?
Set
clockwise
moments equal to
anticlockwise
moments
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What is the
center
of
mass
of
an
object
?
The point where mass acts
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What is speed in physics?
A
scalar quantity
describing how fast
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What is displacement?
Overall
distance
with direction
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What is velocity?
Rate of change of
displacement
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What is acceleration?
Rate of change of
velocity
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What is instantaneous velocity?
Velocity at a
specific
point in time
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How is average velocity calculated?
Final
displacement
divided by
time
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What is uniform acceleration?
Constant
acceleration
of an object
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What do acceleration-time graphs represent?
Change
in
acceleration
over
time
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What do velocity-time graphs represent?
Change
in
velocity
over
time
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What do displacement-time graphs represent?
Change in
displacement
over
time
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What formulas can be used for uniform acceleration?
v
= u + at, s =
ut
+
0.5at²
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How do you find the final velocity of a stone dropped from 50 m?
Use
v²
=
u²
+
2as
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How do you find the time of fall for a stone dropped?
Use s =
ut
+
0.5at²
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What is projectile motion?
Motion with
independent
vertical and horizontal components
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How do you find the maximum height of a projectile?
Use
vertical component
until
v = 0
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