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forces Flashcards

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1
Q

What is a scalar quantity?

A

Something that can be measured but ONLY has a magnitude (size).

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2
Q

Name 3 examples of scalar quantities.

A

~Temperature
~Distance
~Mass

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3
Q

What is a vector quantity?

A

Something that has both magnitude and direction.

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4
Q

Name 3 examples of vector quantities.

A

~Force
~Velocity
~Momentum

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5
Q

Name 3 examples of contact forces.

A

~Tension
~Friction
~Air Resistance

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6
Q

Name 3 examples of non-contact forces.

A

~Magnetic force
~Electrostatic
~Gravitational

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7
Q

What is Gravitational Field Strength measured in?

A

Newtons per Kilogram (N/KG)

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8
Q

What is the Earth’s Gravitational Field Strength?

A

9.8N/Kg

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9
Q

What is the equation for weight?

A

Weight= mass x gravitational field strength

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10
Q

Define work done.

A

When an energy is transferred from one store to another or when a force causes an object to move.

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11
Q

What is the equation for work done?

A

Work done(J)= Force(N) x Distance(M)

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12
Q

Define a moment.

A

The turning effect of a force.

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13
Q

What is the equation for moments?

A

Moment = force x distance

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14
Q

What is a moment measured in?

A

Newton-metres

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15
Q

What is a lever?

A

A simple machine consisting of a pivot, effort and load.

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16
Q

What is a gear?

A

A wheel with toothed edges that rotates on an axle.

17
Q

What is pressure?

A

The force per unit of area and determines the effect of a force on a surface.

18
Q

What is pressure measured in?

A

Pascals (Pa).

19
Q

What is the equation for pressure?

A

Force normal to a surface divided by area of that surface.

20
Q

How do you calculate pressure in a liquid?

A

Height of column x density of the liquid x gravitational field strength

21
Q

What is atmosphere?

A

The layer of air around the earth that is thin and becomes less dense as the altitude increases.

22
Q

What is atmospheric pressure caused by?

A

Air molecules colliding with a surface.

23
Q

What is the equation for Hooke’s Law?

A

Force = spring constant(K) x extension(e).

24
Q

What is Hooke’s Law?

A

A measure of stiffness of a spring up to its limit of proportionality.

25
Q

What is the limit of proportionality?

A

Point that is beyond Hooke’s Law and makes it untrue.

26
Q

What is elastic potential energy?

A

Energy stored in a spring.

27
Q

What is the equation for elastic potential energy?

A

0.5 x spring constant x (extension) squared

physics (7 decks)

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