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Physics > Forces > Flashcards

Forces Flashcards

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1
Q

What is a force

A

A push or a pull exerted upon an object

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2
Q

What effects can a force have on an object

A 
Can start an object to move
Stop a moving object
Change the direction of a moving object
Rotate an object
Change the speed of a moving object
Change the shape of an object:
          Temporary - Elastic
          Permanent - Plastic
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3
Q

What can you use to measure force

A

Newton Meter

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4
Q

What are the two ways that force can be categorised

A

Contact or Non-Contact

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5
Q

What is a contact force

A

Results when two bodies are in contact with each other

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6
Q

What is a non-contact force

A

Results from action at a distance between two bodies

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7
Q

What are 3 contact forces

A

Friction
Tension
Compression

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8
Q

What are 3 non-contact forces

A

Gravitational Force
Magnetic Force
Electrostatic Force

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9
Q

What is a second way of categorising forces

A

Forces acting on the same object vs Forces acting on two different objects

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10
Q

What is a resultant force

A

A single force which has the same effect as two or more forces acting on an object

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11
Q

What is mass

A

The amount of matter inside an object

Measured in kilograms

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12
Q

What is weight

A

This is the force of gravity acting on an object to pull it down
Weight is measured in Newtons

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13
Q

What is the gravitational acceleration on Earth

A

9.81

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14
Q

What are the two factors that affect the strength of the gravitational force

A

Mass of the object

Distance between the objects`

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15
Q

WHAT ARE THE FERROMAGNETIC MATERIALS

A

Iron
Steel
Cobalt
Nickel

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16
Q

Look in book for magnetic field lines

A

.

17
Q

What is static electricity

A

Build up of electrical charges on the surface of objects. Discharges when it is given a path. Once off movement of charge

18
Q

What is current electricity

A

Continuous flow of charge through a conductor

19
Q

Which way do electrons flow in the triboelectric series

A

Protons flow from the more positive object to the negative object

20
Q

What are the two ways in which an electroscope can be used

A

Detect whether or not an object is charged

Determine whether an object is positively or negatively charged

21
Q

How do you tell whether or not an object is charged via the electroscope

A

Place the object near the electroscope and if the leaf deflects either outwards or inwards the object is charged

22
Q

How do you determine whether an object is positively or negatively charged

A

You have to know the charge of the electroscope and then you can work out the charge of the object from there. If the electroscope is negatively charged and the leaf falls back down to the rod then the object is positive.

23
Q

What is lightning

A

A discharge of charge that has built up in a thundercloud

Physics (4 decks)

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