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physics 10 > Forces and Motion > Flashcards

Forces and Motion Flashcards

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1
Q

Acceleration equation?

A 
Acceleration = change in velocity/ time take 
A = (v-u)/ t
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2
Q

Average speed equation?

A

Average speed = distance moved/ time taken

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3
Q

What are forces?

A

Forces are pushes or pulls that one body exerts on another

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4
Q

What can forces do?

A

Forces can change the way things are moving, make things start to move or stop moving, and change the shape of things

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5
Q

What is weight?

A

The force that acts on a body because of gravity

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6
Q

What is friction?

A

The force that opposes motion (acts in opposite direction), either when you try to make something move or whilst it is moving

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7
Q

What is air resistance (drag)?

A

(A force). Friction between an object and the air (or gas) it is moving through

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8
Q

What is viscous drag?

A

(A force). Similar to air resistance, but occurs when an object is moving through a liquid

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9
Q

What is upthrust?

A

The upward force that liquid and gases exert on objects

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10
Q

What are magnetic forces?

A

Forces that magnets exert on other magnets or things made of iron (or other ferrous materials)

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11
Q

What are electrostatic forces?

A

The force between electrically charged objects

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12
Q

What is a vector quantity?

A

Both size and direction are important, examples: displacement (s), velocity (v) and force

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13
Q

What is displacement?

A

(s) distance travelled in a specified quantity

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14
Q

What is velocity?

A

(v) speed in a specified direction

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15
Q

What is a scalar quantity?

A

Just size, no need to take direction into account, examples: speed, distance, mass, energy

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16
Q

What happens to resultant forces acting on a line in the same direction?

A

They add

17
Q

What happens to resultant forces acting on a line in opposite directions?

A

They subtract

18
Q

Unbalanced force equation?

A

Unbalanced force = mass x acceleration

F = m x a

19
Q

Weight equation?

A 
Weight = mass x g
W = m x g
20
Q

Why do falling objects reach a terminal velocity?

A

The size of the drag force caused by air resistance increases with speed - at some speed the size of the drag force will be enough to balance the weight of the object. So the overall resultant force on the object will be zero so that it no longer accelerates, having reached its maximum or terminal velocity.

21
Q

What factors affect vehicle stopping distance?

A

Speed, mass, road conditions and reaction time

22
Q

Momentum equation?

A

Momentum = mass x velocity, momentum = mv

23
Q

Force equation?

A

Change in momentum/ time taken

physics 10 (3 decks)

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