Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics > Section 1- Motion And Forces > Flashcards

Section 1- Motion And Forces Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

What’s a vector quantity ?
Examples

A

Have magnitude (size) and direction
Force, velocity , displacement,acceleration etc

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What’s a scalar quantity ?
Examples

A

Only have magnitude but no direction
Speed, distance , mass , energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Scalar or vector?
Distance
Displacement
Speed
Velocity

A

Distance - scalar
Displacement - vector
Speed- scalar
Velocity- vector

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Equation for distance travelled ..

A

Distance travelled = average speed (m/s) X time (s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Average speed of walking,running, cycling

A

Walking - 1.4m/s
Running- 3m/s
Cycling- 5.5m/s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

2 types Equipment to measure distance and time. When they’re useful

A

Light gates- short time intervals, get rid of bad human reaction time
Rolling tape measure- measure a persons walking speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Equation for acceleration…

A

a=(v-u) /t
(Final velocity- initial velocity) / time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What’s acceleration ?

A

Rate of change of velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What’s constant acceleration sometimes called?

A

Uniform acceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the acceleration due to gravity ? xm/s

A

10m/s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

equation of uniform acceleration…
What’s uniform acceleration?

A

V^2-U^2=2 X A X distance
Final velocity- initial velocity= 2 X acceleration X distance
If an objects velocity is increasing at a steady rate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is Newton’s first law?

A

A resultant force is needed to make something start moving,speed up or slow down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What will happen if the resultant force on a moving object is 0?

A

It will remain moving at the same velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What will a non-zero resultant force produce ?

A

Acceleration or deceleration in the direction of force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What’s the force that keeps something moving in the centre of a circle?

A

Centripetal force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is acceleration inversely proportional to?

A

The mass of an object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Newton’s second law formula…

A

F=m X a
Force = mass X acceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is inertia?

A

The tendency for a motion to remain unchanged.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

How do we find inertial mass?

A

Rearranging Newton’s second law
m=F/a

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is Newton’s third law?

A

When two objects interact, the forces they exert on each other are equal and opposite

21
Q

What’s equilibrium

A

a state in which opposing forces or influences are balanced.

22
Q

Investigating motion core practical.
What does it test?

A

Newton’s second law F=mXa

23
Q

How to carry out the investigating motion practical

A

1.Measure mass of trolley,unit masses and hanging hook.measure length of card which will interior light gate beams. Set up apparatus
2.adjust height of ramp until trolley starts to move.
3.mark a line on the ramp just before the light gate. Light gate will record initial speed of the trolley as it begins to move
4. Attatxh trollet to hanging mass by the string. Hold the trollet still at the start line.let it go do it rolls down the slope
5.the weight of the hook and any masses attached to it will provide accelerating force equal to the mass of the hook X gravity
6. The light gates wil record the speed of the trolley as it passes through. Then do the equation a-(v-u)/t
7. Repeat 3 times and calculate avaradhe acceleration

24
Q

How do we investigate how the mass of the system affects acceleration ?

A

Add masses one at a time to the trolley
When you add mass calculate the systems acceleration

25
Q

What changes in the experiment and what stays the same?

A

Mass of trolley and hook changes
Total mass stays the same

26
Q

How do we measure weight

A

Calibrated spring (newton meter)

27
Q

How do we calculate weight?

A

Weight (N) = mass (kg) X gravitational field strength (n/kg)

28
Q

How do we calculate momentum? Isit scalar or vector?
Unit for momentum…

A

Mass X velocity. p=m X v
Vector
Kg m/s

29
Q

What’s momentum before and after an event like in a closed system like a collision.

A

The total momentum before and after an event is the same.
This is callled conservation of momentum

30
Q

Momentum before =

A

Momentum before = momentum after

31
Q

What happens when a resultant force acts on an object?

A

The objects momentum changes

32
Q

Equation for force…

A

Force =(mv-mu)/t
Force = change in momentum /time

33
Q

What does a fast change In momentum mean ?

A

A big force acting on it

34
Q

Example of change in momentum and force interlinking…

A

In a car crash someone’s momentum changes very fast, this means they’re under a bigger force will will cause more injury

35
Q

test to check reaction time…

A

Ruler drop test

36
Q

How to carry out the ruler drop test?

A

1.Sit with your arm resting on the edge of a table(stops you from moving arm up or down). Get someone to hold a ruler between your thumb and forefinger lined with zero.
2.without warning,the person holding the ruler should drop it. Close thumb. And finger to try catch is as quick as possible
3.measurement of ruler howfrom 0 is how is how far the ruler dropped in the time you reacted
4.the longer the distance, the longer the reaction time
5.. repeat a few times and take mean reaction time.

37
Q

How to calculate stopping distance?

A

Stopping distance= thinking distance +braking distance

38
Q

What is thinking distance ?

A

Distance the car travels in the time it takes the driver to notice the hazard and apply the brakes

39
Q

What’s the braking distance ?

A

Distance to stop once brakes have been applied

40
Q

Factors affecting thinking distance…

A

Speed
Reaction time

41
Q

Factors affecting braking distance…

A

Speed
Friction between tyres and road
How good your brakes are
Mass of the car

42
Q

Why are large decelerations dangerous ? How to lower the force?

A

Because they require a lot of force so can cause serious injuries
To lower the force slow the object over a long period of time

43
Q

Features in a car that increases collision times …

A

Seatbelt
Airbag

44
Q

How to calculate distance ?

A

Distance = Speed X Time

45
Q

How to calculate acceleration

A

Acceleration = final velocity - initial velocity / time

46
Q

How to calculate force ?

A

Force = mass X acceleration

47
Q

How to calculate weight ?

A

Weight = mass X gravitational field strength

48
Q

How to calculate gpe?

A

GPE= Mass X gravity X height

49
Q

How to calculate momentum

A

Momentum = Mass X Velocity

Physics (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions