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Physics. > Chapter 2 Mock > Flashcards

Chapter 2 Mock Flashcards

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1
Q

What is a scalar quantity

A

Is a quantity that just has magnitude- size but no specific direction

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2
Q

What is a vector quantity

A

A quantity that has both magnitude (size) and a specific direction

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3
Q

Examples of scalar quantities

4

A

Speed
Mass
Energy
Area

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4
Q

Examples of vector quantities

5

A 
Displacement 
Velocity 
Acceleration 
Momentum
Force
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5
Q

What is velocity

A

Speed in a stated direction

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6
Q

Formula for distance

A

D

S T

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7
Q

Equation for acceleration

A

(V-u)

T

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8
Q

How are Light gates used

A

A piece of card is attached to car and the light gate is attached to a laptop, the time is measured for how long It takes for Card to pass through light gate. The distance is the Length of the card.

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9
Q

Typical walking speed

A

1.4m/s

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10
Q

Typical speed for wind

A

4.2m/s

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11
Q

Average speed of sound

A

340m/s

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12
Q

Average speed for cycling

A

15.5km/h

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13
Q

What is the acceleration in free fall

A

10m/s2

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14
Q

What is Newton’s first law

A

An object in motion will remain in motion and a stationary object remains stationary unless acted upon by an unbalanced force

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15
Q

What is Newton’s second law

A

An objects acceleration depends on the strength of the unbalanced force acting on it and the mass of The object

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16
Q

Formula for force

A

F

M A

17
Q

What’s Newton’s third law

A

For every action there is an opposite and opposing reaction.

18
Q

How is weight measured

A

Newton’s

19
Q

Formula for weight

A

W

M G

20
Q

Describe relationship between the weight of a body and the gravitational field strength

A

Weight is a result of gravity. The gravitational field strength of earth is 10 n/kg
(Newton’s per kilogram)

21
Q

What is an object moving in a circular orbit at a constant speed doing

A

Changing velocity

22
Q

For motion in a circle what does there need to be for it to continue this shape

A

The centripetal force that acts towards the centre of the circle

23
Q

What is inertial mass

Or known as the ratio of force over acceleration

A

A measure of how difficult it is to change the velocity of an object (including from rest)

24
Q

What is conservation of momentum in collisions

A

The momentum before a collision is the same after

25
Q

Formula for momentum

A

P

M V

26
Q

Name the 3 types of collisions and what they do

A

Elastic- kinetic energy is conserved
Inelastic- kinetic energy is not conserved
Completely inelastic- kinetic energy is not conserved and the colliding objects stick together after collision

27
Q

Method of measuring human reaction times

A

Drop a ruler at any point in time, another person will catch it and you use that distance and the time from stopwatch to calculate speed

28
Q

What is stopping distance a sum of

A

Thinking distance and braking distance

29
Q

How does mass of vehicle effect stopping distance?

A

Braking distance increases as mass increases

30
Q

How does speed of vehicle effect stopping distance?

A

Stopping distance is further for faster speeds

31
Q

How does the drivers reaction time effect stopping distance?

A

The more alert the driver is of the road and driving the smaller the stopping distance
If a driver was tired or under the influence or alcohol or drugs the stopping distance will be increased

32
Q

How does state of the vehicles brakes effect stopping distance?

A

Bad tyres reduce friction with road which creates a slippery and more dangerous surface

33
Q

How does state of road effect stopping distance?

A

Icey and wet roads will increase stopping distance considerably

34
Q

How does a large deceleration cause dangers

A

When a object abruptly stops the person inside won’t and will carry on moving forward and can be injured

35
Q

How to find out displacement

A

Measure From start point to end point with a direction

Physics. (20 decks)

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