Forces Flashcards

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0
Q

What is force measured in?

A

Newtons (N)

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1
Q

What can forces do?

A

Squash, stretch, move, accelerate, pull or push objects

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2
Q

What is a resultant force?

A

All the forces acting on an object represented by one arrow.

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3
Q

What does it mean if a resultant force of an object is 0?

A

The object is - stationary or continues to move at the same speed and direction it was moving.

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4
Q

What is happening to the object if the resultant force is not zero and is in the opposite direction to the motion of the object?

A

The object is decelerating.

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5
Q

How do we calculate force?

A

Force = mass x acceleration.

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6
Q

If a resultant force is acting upon an object what does it mean?

A

The object is accelerating.

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7
Q

What is the difference between mass and weight?

A

Mass is the measure of how much matter is in an object.

Weight is a measurement of how hard gravity is pulling on the object.

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8
Q

How do we calculate weight?

A

Weight = mass x gravitational field strength

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9
Q

What is the gravitational field strength on earth?

A

10 n/kg

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10
Q

If an object falls with only gravity acting on it what is it said to be doing?

A

Free falling

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11
Q

What first happens when an object free falls?

A

The object accelerates.

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12
Q

What then happens?

A

The object accelerates to a terminal velocity.

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13
Q

What is a terminal velocity?

A

Where a free falling object travels at constant velocity as the weight of the object is balanced by air resistance.

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14
Q

Does an object has a resultant force when travelling at a terminal velocity?

A

No, there is no acceleration.

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15
Q

When an elastic object as it’s length increased what is this called?

A

It’s extension.

16
Q

What is hooke’s law?

A

The extension is proportional to the load applied.

17
Q

How can fuel economy in a vehicle be improved?

A

Remove weight, close windows to decrease drag, replace old tyres.

18
Q

What happens if an object fall in liquid?

A

A drag force acts on it and the acceleration on the object decreases as it falls.