P2 Motion Flashcards

0
Q

Define speed.

A

Rate of change of distance with time. Direction isn’t implied.

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1
Q

Define velocity.

A

Speed with direction

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2
Q

What is the formula triangle for speed?

A

D

V * T

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3
Q

If Bolt can do the 200 meters in 19.32 seconds, what is his speed?

A

200 divided by 19.32

His speed was 10.35 meters per second.

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4
Q

Define acceleration.

A

How quickly velocity is changing.

It can be in speed or in direction.

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6
Q

How do you calculate the speed of a thing from a distance time graph?

A

Look at the gradient. Divide the distance travelled by the time taken.

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7
Q

What is the formula for accerleration?

A

Change in velocity divided by time taken.

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8
Q

What does a flat section on a distance time graph mean?

A

The thing isn’t moving.

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9
Q

How do you calculate the acceleration of a thing from a velocity time graph?

A

Vertical change divided by horizontal change.

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12
Q

What does a slope and a flat line mean in a velocity-time graph?

A

Flat sections mean steady speed.
Slopes mean acceleration or deceleration
Curves are changes in acceleration.

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14
Q

What is the difference between mass and weight?

A

Mass is the amount of stuff in an object. It is measured in kilograms.
Weight is the force of gravity acting on an object. It is measured in Newtons and is different depending where you are in the universe.

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15
Q

What is the normal force?

A

If an object is in contact with an surface. E.G a book on a table the normal acts upwards to stop gravity pulling the book through the table.

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16
Q

What is the equation used to calculate the resultant force?

A

Resultant force on the object=

Mass of the object x acceleration of the object

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17
Q

A jaguar F-type accelerates from 2m/s to 6m/s in 5.6 seconds.
What is the acceleration?

A

6-2=4
4 divided by 5.6=0.71
0.71 m/s squared.

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18
Q

What do curves on a distance time graph mean?

A

The thing is accelerating or decelerating. If it is steepening the thing is speeding up and levelling off means it is slowing down.

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19
Q

What number must you multiply speed in m/s to get MPH

A

2.24

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20
Q

A 2.2 tonne rolls royce phantom is travelling at 70M/S. What is the kinetic energy?

A

2200 X 0.5 X 4900

= 539,000.

22
Q

A wheel barrow is pushed for 50m with a force of 50N. What is the work?

A

50 X 50 = 2500 J

23
Q

What is the resultant force?

A

The result of all the forces acting on one object. If there is any the force will cause a change in the objects velocity. Acceleration.

24
Q

What is the equation used to calculate force?

A

Force= mass X acceleration.

25
Q

What is the acceleration due to gravity?

A

10m/s

26
Q

What is the equation used to find work?

A

Work=force X distance in direction of force.

27
Q

What is the equation used to calculate kinetic energy?

A

Kinetic energy= 0.5 X mass X velocity squared.

28
Q

What is the limit of proportionality?

A

The maximum force that the thing can take and still expand proportionally. If you stretch a thing past this limit, it will permanently be disfigured.

29
Q

What is the equation used to calculate momentum?

A

Momentum (Kg M/S) = mass(Kg) X velocity (M/S)

30
Q

How do you calculate the distance travelled with a velocity time graph?

A

Look at the area under a section of graph.

31
Q

How do you calculate average speed?

A

Total distance divided by total time.

33
Q

What is Hooke’s law and his equation?

A

Extension of a spring is dependant on the force on the spring and spring constant.
Force N= gradient spring constant X extension.M

34
Q

How much work would be done if you slowly lifted a 80Kg box to a height of 80cm?

A

50 X 9.81=490.5

490.5 X 0.8=392.4

35
Q

What is the formula used to calculate gravitational potential energy?

A

gravitational potential energy= mass X height X G

36
Q

How much energy does a 70Kg person have when 4M high?

A

70 X 9.81 X 4 = 2746.8 J

37
Q

What is the resultant force if an object is going at a steady speed?

A

There can be no force.

38
Q

What is the formula used to calculate the weight of an object?

A

Weight=mass times gravitational field strength (10 on Earth)

39
Q

What is the spring constant measured in?

A

Newtons per meter.

40
Q

What is weight measured in?

A

Newtons.

41
Q

What is mass measured in?

A

Kilograms.

42
Q

What is work done measured in?

A

Joules.

43
Q

What is the spring constant measured in?

A

Newtons per meter.

44
Q

What is weight measured in?

A

Newtons.

45
Q

What is mass measured in?

A

Kilograms.

47
Q

How is the extension of a spring measured?

A

Measure the difference between the bottom of the spring when it wasn’t extended and the bottom when it was.