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Physics > P4 > Flashcards

P4 Flashcards

1
Q

What is the equation for work done ?

A

Work done= force x distance

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2
Q

What is inertial mass

A

a measure of how difficult it is to change velocity of an object

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3
Q

What is the word equation for momentum

A

Momentum = distance x velocity

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4
Q

What happens to momentum when a force acts on a moving object

A

A change in momentum occurs where the fore is the same as the rate of change of momentum

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5
Q

What are the energy stores change when a moving obstacle hits and object

A

The moving obstacle transfers energy to other stores when it hits something. Eg vibration energy as sound is emitted

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6
Q

State Newton’s first law

A

An object at rest will stay at rest and a moving object will continue moving at constant velocity as long as there is no resultant force

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7
Q

What are the equations for power

A

Power= work done/ time taken

Power= energy transferred/time taken

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8
Q

What is the symbol equation for acceleration

A

A= v/t

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9
Q

What are the energy changes when an object is accelerated by a constant speed

A

It is transferred in to Kendrick energy and makes the object move

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10
Q

What is the equation for moment of a force ?

A

Moment of a force= force c distance

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11
Q

What is terminal velocity

A

It is when the resultant force is 0 and and the object will then be able to go at terminal velocity

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12
Q

What is the equation for gravitational potential energy

A

Mass x gravitational field strength x height

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13
Q

What are the units of gravitational field strength

A

Newtons per kilogram N/kg

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14
Q

How are mass and weight related

A

Mass and weight are proportional

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15
Q

What is the typical walking speed

A

1.5 m/s

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16
Q

What is the equation for Unicode acceleration

A

(Final velocity)squared-( initial velocity) squared = 2 x acceleration X distance

17
Q

For a given braking force how does the stopping distance change with speed of the vehicle?

A

The greater the speed the larger the breaking distance

18
Q

What is needed for velocity to change ?

A

A un balanced resultant force

19
Q

What is the role of a lever

A

To make it easier to lift something

20
Q

What is Newton’s third law

A

Whenever two objects interact the forces they exert on each other are equal and in opposing directions

21
Q

What is the role of a gear

A

To change the force or rotational speed

22
Q

What equation would you need to calculate the power needed to climb up the stairs

A

Energy= mass x height x gravity x power = time taken

23
Q

What is the turning point of a force called

A

The moment of the force

24
Q

What is the word equation for velocity

A

Acceleration = change in velocity/ time taken

25
Q

What may impact the speed at which someone can run walk and cycle at

A

Age, terrain, fitness, distance travelled

26
Q

What is the symbol equation of moment force?

A

M= F d

27
Q

What can affect a drivers reaction time

A

Drugs, alcohol, car performance, how tiers they are and distractions

28
Q

State Newton’s second law

A

The acceleration of an object is equal to the resultant force acting on the object and and inversely equal to the mass of the object

29
Q

Star the unit of momentum

A

Kg m/s

30
Q

What is the word equation for kinetic energy

A

Kinetic energy = 0.5 x mass x (speed) squared

31
Q

What does motion in a circle involve changing velocity

A

Moving in a circle involves constantly

32
Q

What is the equation of the word equation for when force is applied

A

Force= mass x change in velocity/ time taken

33
Q

What is inertia

A

The tendency of objects to continue in their state of rest

34
Q

Ho do you find the acceleration of an object on a distance time graph

A

You draw a tangent to the curve at the time and find the gradient

35
Q

What is he word equation for Newton’s second law

A

Resultant force = mass x acceleration

Physics (2 decks)

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