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Physics > Forces and their affects > Flashcards

Forces and their affects Flashcards

1
Q

What is force measured in ?

A

The newton , N

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2
Q

What force is made from the cyclists tyre?

A

Friction

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3
Q

What force is acting down on the bike as it is being used

A

Weight

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4
Q

What happens to a moving object if the reaultent force is zero?

A

It keeps moving

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5
Q

What happens to a moving object if the resultent force is not zero

A

It speeds up the direction of the resultant force

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6
Q

If we double the resultant force,What happens to the acceleration?

A

It doubles aswell

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7
Q

If the same resultant force was applied on a 1kg ball,2kg ball or a 4kg ball,which would have the most acceleration?

A

1kg as it is the lightest

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8
Q

Force=mass x ?

A

Acceleration

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9
Q

Acceleration= force÷ ?

A

Mass

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10
Q

Mass x acceleration=?

A

Force

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11
Q

How much force is needed to give an acceleration of 2 m/s to a 4 kg box?

A

4x2 = 8N

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12
Q

4N is applied to a 2kg object. What is the acceleration?

A

4÷2= 2m/s

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13
Q

What force is needed to give a acceleration of 10m/s to a 250g box ?

A

250g × 10m/s = 2.5N

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14
Q

A car travels 100m in 5 seconds . what is the average speed?

A

100m÷5 seconds = 20 m/s

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15
Q

On a distance time graph,what does a horizontal line represent ?

A

A stationary object

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16
Q

What does a horizontal line on a velocity time graph represent ?

A

Constant velocity

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17
Q

A car accelerates from rest to 30 m/s in 15 seconds . what is its acceleration ?

A

30 m/s ÷15 seconds = 2m/s2

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18
Q

What does the gradient on a distance time graph represent ?

A

The speed

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19
Q

What does the gradient on a velocity time graph represent?

A

The acceleration

20
Q

What does the area under the velocity time graph represent ?

A

The distance travelled

21
Q

What is thinking distance?

A

The distance travelled between the need for breaking and when the brakes start to act

22
Q

What is breaking distance?

A

The time taken for the car to come to a halt at once the brakes have been applied

23
Q

When driving a car, thinking distance can be increased by?

A

Being alert

24
Q

When driving a car,stopping distance can be increased by ?

A

Driving fast

25
Q

When driving a car, breaking distance can be increased by ?

A

Poor brakes

26
Q

In which direction does friction act ?

A

The opposite direction to movement

27
Q

What force clauses objects to fall ?

A

Weight

28
Q

When an object reaches terminal speed,the vertical forces on it are?

A

Balanced

29
Q

On the moon, if I dropped a hammer and a feather at the same time,which would hit the ground first?

A

Both hit it at the same time

30
Q

A parachutist on the moon would never reach terminal speed because:

A

There is no air on the moon, so no air resistance

31
Q

If a sky diver changed from a vertical to a horizontal position during free fall, what would happen to his terminal speed ?

A

It would decrease

32
Q

When the parachute canopy is opened more drag is created because:

A

It has a large surface area

33
Q

Weight = mass x ?

A

Gravity

34
Q

Mass X gravity=?

A

Weight

35
Q

Weight divided by gravity=?

A

Mass

36
Q

An astronaut has a mass of 100kg. What is his weight on the moon if the gravitational field strength there is 1.6N/Kg?

A

100x1.6= 160N

37
Q

Gravity is always rounded to ?

A

10

38
Q

What is the weight of a 500g object on earth ?

A

500g=0.5kg

0.5x10=5N

39
Q

Elastic objects can store elastic potential energy when they are:

A

Stretched or squashed

40
Q

When an elastic object is changed from its original shape:

A

Work is done

41
Q

Until a certain limit is reached,hooks law states that:

A

That the extension of the elastic object is directly proportional to the force applied

42
Q

Force= spring constant x ?

A

Extension

43
Q

Spring constant x extension = ?

A

Force

44
Q

F=K x e

What do all the letters stand for?

A

F=force
K=spring constant
E=extension

45
Q

A spring with k= 10N/m is stretched from 0.2m to 0.5m the force needed is:

A

0.5-0.2=0.3

So F=10 x 0.3 =3N

46
Q

What happens to the total momentum of a firework when it explodes?

A

It stays the same

Physics (5 decks)

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