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Science > Forces and speed > Flashcards

Forces and speed Flashcards

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1
Q

what is a force

A

A force is a push or pull that causes a change in speed, direction or shape.

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2
Q

what is the formula for speed

A

d/t

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3
Q

what is the formula for distance

A

t x d

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4
Q

what is the formula for time

A

d/s

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5
Q

what is air resistance

A

A force on an object moving through air

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6
Q

what is a balanced force

A

Forces acting on an object that are the same size but act in different directions

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7
Q

if an object has a balanced force what is the object doing

A

it will be stationary or keep moving at a constant speed

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8
Q

what is a drag force

A

the force on an object moving through air or water that makes it slow down

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9
Q

what is a driving force

A

The force that is pushing or pulling something

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10
Q

what is gravity

A

A non contact force that acts between two masses

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11
Q

what is friction

A

The force that resists movement because of contact between surfaces

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12
Q

what is a mass

A

The amount of matter (stuff) a thing is made out of

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13
Q

what is a newton

A

a unit of force, symbol N

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14
Q

what is a kilogram

A

A unit of mass, symbol kg

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15
Q

what does it mean if a object is streamlined

A

Shaped to reduce resistance to motion from air of water

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16
Q

what is pull

A

a type of force

17
Q

what is push

A

a type of force

18
Q

what is a newton meter

A

A piece of equipment used to measure weight in newtons

19
Q

if an object is unbalanced what does it mean

A

opposing forces on an object that are unequal

20
Q

what is water resistance

A

the force on an object that causes it to slow down in water

21
Q

what is weight

A

The force of the Earth on an object

22
Q

upthrust

A

upward force experienced for an object immersed in water

23
Q

density

A

the degree of compactness of a substance

24
Q

What can we say about the forces on an object that is not moving

A

The forces must be balanced

25
Q

A force of 4 N acts on a lever 2 m from the pivot. What is the moment

A

8N

26
Q

What happens to the air resistance on a car as the car goes faster?

A

it increases

27
Q

One way to increase the turning force on a spanner is to

A

Use a longer spanner

28
Q

What store of energy does friction always produce

A

Heat

29
Q

A force that makes things float

A

upthrust

30
Q

density

A

mass of object/ volume of object

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