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Thirds - III Al - ACE > P1.1 Forces > Flashcards

P1.1 Forces Flashcards

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1
Q

What is a force?

A

A push or pull that can move objects

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2
Q

What is the unit of force?

A

Newton (N)

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3
Q

Forces always come in?

A

Pairs

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4
Q

How do you measure a force?

A

Newton meter

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5
Q

What is the main component of a newton meter?

A

A spring

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6
Q

What are balanced forces?

A

When you have equal opposite forces acting on an object

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7
Q

What happens to the motion of an object if it experiences balanced forces?

A

No acceleration (object does not speed up or slow down)

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8
Q

What happens to the motion of an object if it experiences unbalanced forces?

A

Accelerates (speeds up or slows down)

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9
Q

What is a contact force? Give examples

A

A force that acts when two objects are touching. Friction, air resistance, upthrust, reaction force.

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10
Q

What is a non contact force? Give examples

A

A force that acts when two objects are not touching. Gravity, magnetic force, electrostatic force.

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11
Q

What is a field?

A

A region where an object will experience a force

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12
Q

What is a reaction force?

A

A support force from an object

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13
Q

Why does a reaction force occur?

A

As the weight of an object pushes particles closer together, the bonds are compressed, they push back and support the weight of the object.

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14
Q

How can you reduce air resistance?

A

Streamline the objects, reduce it’s surface area

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15
Q

How can you increase air resistance?

A

Increase the surface area of the object

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16
Q

Can you give a useful example of friction?

A

Pencil on paper, friction between floor and your feet, car tyres and the road

17
Q

Can you give an unuseful example of friction?

A

Between a bike chain and the wheel, slipping on ice

18
Q

How can you reduce friction?

A

Use a lubricant

19
Q

How do you calculate the extension of a spring?

A

New length - original length

20
Q

What is Hooke’s Law?

A

When the extension of a spring doubles when you apply twice the force. (This gives a linear graph)

21
Q

What is the elastic limit?

A

When you remove the force on a spring - the spring will not go back to it’s original length

22
Q

What is the difference between mass and weight?

A

Mass does not change - it is the amount of matter an object is made of, weight is a force - it will change depending on location

23
Q

What equation links mass and weight?

A

Weight = Mass x Gravitational Field Strength

24
Q

What is the unit of weight?

A

Newton (N)

25
Q

What is the unit of mass?

A

kilogram (kg)

26
Q

What is the gravitational field strength on Earth?

A

around 10 N/kg

27
Q

How can you calculate the gravitational field strength on any planet?

A

g = W / m (Weight divided by mass)

Thirds - III Al - ACE (6 decks)

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