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Physics 2 > Forces and Acceleration > Flashcards

Forces and Acceleration Flashcards

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1
Q

What is the difference between speed and velocity?

A

Velocity has direction specified.

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2
Q

What is acceleration?

A

How quickly the velocity is changing.

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3
Q

What are the two ways that acceleration can change?

A
  1. Change in speed

2. Change in direction

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4
Q

What is the formula for acceleration?

A

v-u

t

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5
Q

What is the gradient of a distance-time graph?

A

Speed

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6
Q

What is the gradient of a velocity-time graph?

A

Acceleration

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7
Q

How do you find the velocity on a velocity-time graph?

A

The value of the velocity axis

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8
Q

How do you find the distance travelled on a velocity-time graph?

A

Area under the graph

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9
Q

What are the two effects of gravity?

A
  1. Makes everything accelerate towards the ground

2. Gives everything a weight

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10
Q

What is weight?

A

The pull of the gravitational force.

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11
Q

What is weight measured in?

A

Newtons, N.

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12
Q

What is the formula for mass, weight and gravity?

A 
W = m x g
N = kg x N/kg
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13
Q

What is resultant force?

A

The overall force on a point or object.

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14
Q

How is resultant force found?

A

Adding or subtracting parallel forces acting on the same line.

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15
Q

What does a resultant force cause?

A

A change in the object’s velocity.

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16
Q

If the resultant force on a stationary object is zero…

A

… the object will remain stationary.

17
Q

If there is no resultant force on a moving object…

A

… it’ll just carry on moving at the same velocity.

18
Q

If there is a non-zero resultant force…

A

… then the object will accelerate in the direction of the force.

19
Q

What is terminal velocity?

A

The maximum speed that an object can fall through a fluid.

20
Q

How is terminal velocity reached?

A
  1. Speed increases, friction increases
  2. Frictional force balances accelerating force
  3. Object stops accelerating
21
Q

What does frictional force depend on?

A

Shape and area.

22
Q

What other factor is there in terms of terminal velocity?

A

Air resistance.

Physics 2 (7 decks)

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