P1 Flashcards

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1
Q

What is used to measure very small distances?

A

micrometer screw gauge

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2
Q

Speed formula

A

total distance / total time

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3
Q

Define acceleration

A

change of velocity / total time

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4
Q

Acceleration is the…

A

gradient of a speed-time graph

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5
Q

Acceleration of a free fall g for a body near to the Earth is _________.

A

constant

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6
Q

What do you calculate to find the distance travelled for motion with constant acceleration.

A

the area under a speed–time graph

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7
Q

Define speed

A

a measure of how fast an object is moving

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8
Q

Earth is the source of a ___________________.

A

gravitational field

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9
Q

Define weight

A

W=mg

g=10N/kg

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10
Q

Define mass

A

m=W/g

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11
Q

The mass of a body is the _____________ in it, whereas the weight of a body is the _____________________ acting on it.

A

amount of matter, measurement of gravitational force

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12
Q

Define velocity

A

speed in a specific direction

same formula as speed but uses + and - signs to identify whether it is accelerating or decelerating

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13
Q

When something speeds up/slows down, it is:

A

accelerating/decelerating

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14
Q

3 fundamental effects of force

A

change in shape, size, motion(velocity)

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15
Q

Newton’s 2nd law of motion:

A

Resultant Force applied =
Mass of object X acceleration of object

F(N) = m(kg) x a(ms^-2)

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16
Q

Force applied is _________________ to the extension of the spring.

A

directly proportional

17
Q

Hooke’s Law

A

F = kx

18
Q

What does ‘k’ represent in the Hooke’s law formula?

A

spring content

19
Q

Elastic limit

A

spring no longer goes back to its original length - beyond this limit, the object will behave like plastic.

20
Q

What is this formula used for?
p=m/v

A

density

21
Q

Air resistance is a form of __________.

A

friction

22
Q

Define friction

A

the force between two
surfaces which impedes motion and results in
heating.

23
Q

The turning effect of a force depends on applying a force…

A
  1. at 90 degrees to the hige/pivot
  2. as far from the hinge as possible
24
Q

Define moment

A

the turning effects of a force

25
Q

Moment formula

A

Force perpendicular to the hinge x perpendicular distance from pivot

moment(Nm) = F(N) x d(m)

26
Q

What is the gravity of Earth?

A

10N/kg

27
Q

Centre of mass

A

the point through which the weight appears to act.

28
Q

How to find the centre of mass of regular-shaped objects:

A
  1. draw 2 lines of symmetry
  2. where the lines cross = centre of mass
29
Q

Pressure formula

A

P(N/m^2) = F(N) / A(m^2)

30
Q

Unit for pressure

A

(Pa)Pascal