Dynamics Flashcards

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1
Q

What does Newton’s 2nd Law state?

A

The rate of change of momentum of a body is proportional to the applied force and takes place in the direction in which the force acts.
F = m x a

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2
Q

What is Newton’s 1 law?

A

A body at rest remains at rest and a body in motion continues to move at a constant velocity unless acted upon by an external force.
(Inertia)

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3
Q

What is Newton’s 3rd law ?

A

Every action has an equal and opposite reaction

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4
Q

Formula for weight

A

M x g

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5
Q

Density equation

A

Mass / volume

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6
Q

Formula for work

A

Force x distance

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7
Q

Unit of work

A

Nm or J

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8
Q

What is power

A

Measure of the rate at which work is done

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9
Q

Formula for power (W)

A

Energy used / time taken

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10
Q

Equation for GPE

A

M x g xh

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11
Q

What is kinetic energy

A

Movement energy

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12
Q

Formula for kinetic energy

A

KE = 1/2 mv^2

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13
Q

2 types of mechanical energy

A

Kinetic and potential

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14
Q

What is thermal energy

A

Heat Or internal energy. Energy body has because of kinetic energy and potential energy of its molecules.

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15
Q

What is the conservation of energy

A

Cannot be created or destroyed but it can change from one thing to another

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16
Q

What is an in elastic collision

A

When two objects collide they stick.

17
Q

Formula for elastic

A

M1U1 + M2U2 = M1V1 + M2V2

18
Q

Formula for inelastic

A

M1V1 + M2V2 = (M1 + M2) V

19
Q

Equation for momentum

A

Mass x velocity

20
Q

What is the unit of impulse

A

Ns

21
Q

What is impulse

A

Change in momentum

22
Q

Formula for impulse

A

Ft = m delta v

23
Q

What is a gyroscope

A

Spinning mass

24
Q

Two properties of gyroscopes

A

Rigidity - related to law of inertia

Precession ( right angle obstinacy)

25
Q

What is a perfect gyro

A

A free gyro

26
Q

Define friction

A

Work done as two surfaces rub against each other

27
Q

Equation for friction

A

F = wm

28
Q

What are the three kinds of friction

A

Starting friction
Sliding friction
Rolling friction