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Forces Flashcards

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1
Q

Velocity is speed in a given

A

Direction

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2
Q

When two objects interact. They exert ______ and _______ forces on each other.

A

Equal and opposite

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3
Q

Acceleration (m/s^2) =

A

Time taken (seconds)

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4
Q

A moving object acted on by a resultant force: In the same direction as the direction of its motion, does what?

A

Accelerates

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5
Q

Weight (N) =

A

Weight (N)= mass (kg) x gravitation field strength (M/kg)

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6
Q

The slope of a distance time graph represents

A

The speed

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7
Q

_____ distance = thinking distance + braking distance

A

Stopping

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8
Q

Three factors affecting thinking distance

A

Tiredness, drugs, alcohol, distractions

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9
Q

Speed (m/s)=

A

Speed (m/s) = distance travelled (m)
—————————-
Time taken (s)

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10
Q

Force=

A

Force= mass (kg) x acceleration (m/s^2)

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11
Q

A moving object acted on by a resultant force: in the opposite direction as the direction of its motion, does what?

A

Decelerates

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12
Q

The value of the Earth’s gravitational field strength at its surface is about…

A

10N/kg

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13
Q

The steeper the slope in a distance time graph, the greater the _______ it represents.

A

Speed

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14
Q

Braking distance is the distance the vehicle travels

A

Under the braking force

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15
Q

Thinking distance is the distance travelled by the the vehicle in the time it takes…

A

For the driver to react

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16
Q

Acceleration is a change of ______ per second

A

Speed

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17
Q

The unit of force is the ____ (____)

A

Newton, N

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18
Q

Three factors affecting braking distance:

A

Poorly maintained brakes and tyre, road and weather conditions

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19
Q

Kinetic energy =

A

Kinetic energy (J) = mass (kg) x velocity^2 (m/s)^2
—————————————-
2

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20
Q

If the orbital radius for the Earth is 1.5 x 10^11m, what is its orbital speed?

A

9.42 x10^11m per year or 29,850.18 m/s

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21
Q

What force allows comets and planets to orbit the sun?

A

Gravitational force

22
Q

A force of 100N acts on an object for 4 seconds. What is the momentum change of the object?

A

400 Ns

23
Q

Vectors have size and _____.

A

Direction

24
Q

Moment =

A

Moment = perpendicular force x distance

25
Q

What is a comet made from?

A

Dust and ice

26
Q

Elastic potential energy can be stored when as an object is _____ or ____.

A

Stretched or squashed

27
Q

Change in momentum (kg m/s) =

A

Change in momentum (kg m/s) = force (N) x time (s)

28
Q

What is a galaxy?

A

A collection of billions of stars

29
Q

An object falling in air resistance reaches a ____ ____

A

Terminal velocity

30
Q

A 40kg woman is running at 8m/s. What is her momentum?

A

320kg m/s

31
Q

Gravitational field strength, g, is smaller on which astronomical object?

A

The moon, Pluto, mercury etc

32
Q

What is true about interaction pairs if forces?

A

Always equal in size, opposite in direction, act on different ovjects

33
Q

The kinetic energy of a moving object depends on its ____ and ____

A

Mass and speed

34
Q

Orbital speed=

A

Orbital speed= 2 x pi x r
————-
T

35
Q

Give three examples of orbiting objects.

A

Comets, planets, the moon, artificial satellites

36
Q

Calculate the momentum of a lorry of a mass 5000kg travelling at 2m/s

A

10000kg m/s

37
Q

Gravity causes ______ to orbit the sun; moons and _____ to orbit the Earth, and comets to orbit the____.

A

Planets
Satellites
Sun

38
Q

Work done (J) =

A

Work done (J) = force (N) x distance (m)

39
Q

The more time an impact takes, the _____ force exerted per second.

A

Less

40
Q

What is the universe?

A

A large collection of billions of stars

41
Q

If car has travelled 3000m in 100 minutes what is its speed in m/min and m/s?

A

30 m/min

0.5 m/s

42
Q

A parachutist has a weight of 800N. He is falling at a steady speed. What is the resultant force acting on him?

A

0 Newtons

43
Q

An object falling freely accelerates at

A

10m/s^2 or g

44
Q

Give three examples of vector quantities in physics

A

Velocity, time, force, momentum

45
Q

Gravitational field strength, g, is larger on which planet?

A

Jupiter, Saturn etc

46
Q

What is the equation to calculate speed?

A

Speed =distance/ time

47
Q

Momentum=

A

Momentum (kg m/s) = mass (kg) x velocity (m/s)

48
Q

How does extension vary with applied force for springs?

A

Proportionally, up to the elastic limit

49
Q

The _________ system is part of the _______ galaxy, which is a collection of billions of ________. The _______ is a collection of billions of _____.

A 
Solar
Milky Way
Stars
Universe
Galaxies
50
Q

A heavy box is standing on the floor. What is the name of the force holding it up?

A

Normal contact reaction force

Physics (8 decks)

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