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Physics Paper 2 > P8: Forces > Flashcards

P8: Forces Flashcards

1
Q

What is a scalar quantity?

A

A quantity with magnitude only

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2
Q

What is a force?

A

A push or a pull that acts on an object due to the interaction with another object

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3
Q

What are 3 examples of contact forces?

A

Friction, air resistance and tension

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4
Q

What are 3 examples of non-contact forces?

A

Gravitational force, electrostatic force and magnetic force

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5
Q

What type of quantity is force?

A

A vector

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6
Q

What is weight?

A

The force acting on an object due to gravity

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7
Q

What is the formula for weight?

A

W = mg

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8
Q

What is the relationship between weight and mass?

A

They are directly proportional

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9
Q

What instrument is used to measure weight?

A

A calibrated spring balance

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10
Q

What is the resultant force?

A

The single force that has the same effect as all the original forces acting together

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11
Q

What is the equation for work done?

A

W = Fs (distance)

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12
Q

What is one joule equivalent to?

A

One newton meter

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13
Q

What is the moment?

A

The turning effect of a force

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14
Q

What is the equation for a moment? What is its unit?

A

M = Fd in Newton meters

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15
Q

What does Newton’s First Law state?

A

If the resultant force acting on a stationary object is 0, it will remain this way. Similarly, if the resultant force acting on a moving object is 0, it will move at the same velocity throughout

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16
Q

What is inertia?

A

The tendency of objects to continue in their state of rest/uniform motion

17
Q

In a free body diagram of a plane, what do the arrows represent?

A

Upwards arrow = life, downwards arrow = weight, forwards arrow = thrust and backwards arrow = air resistance

18
Q

What 2 properties might be affected by resultant force?

A

Speed and direction

19
Q

How do you draw scale diagrams?

A

Put arrows tip to tail, and do pythagoras. To find the size, find the angle

20
Q

How do you resolve a force?

A

Make a scale, then draw horizontal and vertical components of the line and measure with ruler. Ensure you change back to newtons

21
Q

What do levers do?

A

They transmit the turning effect of a force

22
Q

Which force in a lever is closer to the pivot?

A

Output, meaning a larger force

Physics Paper 2 (9 decks)

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