4.3 Equations of Motion Flashcards

1
Q

What is distance?

A

the total length between two points

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2
Q

What is speed?

A

the total distance travelled per unit of time

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3
Q

What is displacement?

A

the distance of an object from a fixed point in a specified direction

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4
Q

What is velocity

A

the rate of change of displacement of an object

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5
Q

What is acceleration

A

the rate o change of velocity of an object

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6
Q

What is the equation of velocity?

A

v = change in displacement/time

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7
Q

what is the equation of acceleration

A

a = change in velocity/time

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8
Q

What is instantaneous speed (or velocity)?

A

the speed of an object at any given point in time

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9
Q

How is acceleration shown on a displacement time graph?

A

a curved line
- it has a changing velocity

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10
Q

How is velocity shown on a displacement time graph?

A

gradient of a straight line
- may be at a tangent to the curve

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11
Q

What is the average speed?

A

the total distance/ time

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12
Q

How do you find average speed on a displacement time graph?

A
  • divide the total displacement by the total time
    gradient of the line
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13
Q

what are the 3 motion graphs?

A

displacement time graphs
velocity time graphs
acceleration time grahs

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14
Q

How can you find velocitythe on a displacement time graph?

A

the gradient
- positive slope represents motion in the positive direction
- negative slope represents motion in the positive direction

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15
Q

How do you find the acceleration on a dt graph?

A

curved line

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16
Q

What is the area under the curve of a dt graph?

17
Q

What does a horizontal line represent on a dt graph?

A

a state of rest

18
Q

What is the initial displacement of a dt graph?

A

the y intercept

19
Q

How is the acceleration shown on a velocity time graph?

A
  • the gradient of the slope
  • a positive slope represents an increase in velocity in the positive direction
  • a negative slope represents an increase in velocity in the negative direction
  • a curved line represents non-uniform acceleration
20
Q

How is constant velocity represented on a vt graph?

A

a horizontal line

21
Q

How is displacement represented on a vt graph?

A

the area under the curve

22
Q

What can be shown on an acceleration time graph?

A
  • y intercept is initial acceleration
  • horizontal line is constant acceleration
  • area under the curve is the change in velocity
23
Q

What is the acceleration due to gravity of a bouncing ball?

A
  • always in the same direction in a uniform gravitational field such as earths surface
24
Q

What is the velocity of a bouncing ball?

A
  • because the ball is going up and down it changes direction
  • thus the velocity of the ball will change from - to + dependent on the direction
25
In projectiles; what is the time of flight?
how long the projectile is In the air
26
in projectiles; what is the maximum height attained
the height w at which the projectile is momentarily at rest
27
In projectiles; what is range?
the horizontal distance travelled by the projectile
28
What are the 3 possible scenarios for projectile motion
- vertical projection - horizontal projection - projection at an angel
29
What are drag forces
forces that oppose the motion of an object moving through a fluid
30
What are the properties of drag forces?
- always in the opposite direction to the direction of motion of the object - never speed up an object or start them moving - slow down an object or keeps them moving air a constant speed - converts kinetic energy into heat and sound
31
What is lift?
an upwards force on an object moving through a fluid perpendicular to the flow
32
What is the relationship between drag forces and the speed of an object
as the speed increases the drag increases
33
What is air resistance?
an example of a drag force that objects experience when moving through the air
34
what is the relationship with air resistance and th speed of an object?
air resistance increase with the speed of the object
35
What factors effect the maximum speed of the object, other than air resistance?
- cross sectional area - shape - altitude - temprature - humidity
36
how does air resistance effect projectiles?
- it decreases the horizontal component of the velocity of a projectile - thus the range and max height is decreased compared to no air resistance
37
what does it mean if air resistance is negligible?
- the air resistance is so small it does not make a difference to the motion of the object. - thus you do not take any drag forces into account during calculations
38
What is terminal velocity?
the maximum velocity that the object can have - when drag forces are equal to the gravitational pull on the body and the body will no longer accelerate and fall at a constant velocity
39
What is the relationship between acceleration and drag forces?
the drag forces increase as the body acelerates - increasing velocity means drag forces will increase