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Science > Forces > Flashcards

Forces Flashcards

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1
Q

What is air resistance?

A

The force on an object. moving through the air that causes it to slow down

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2
Q

What is friction?

A

The force that resists movement because of contact between surfaces

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3
Q

What is mass?

A

the amount of matter (stuff) a thing is made up of

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4
Q

What is a Newton?

A

The unit of force, symbol N

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5
Q

What is weight?

A

The force of the Earth on an object due to its mass

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6
Q

What is tension?

A

A stretching force

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7
Q

What is lift?

A

A force pushing upwards on an object flying in the air

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8
Q

What is upthrust?

A

A force pushing upwards on an object in a liquid

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9
Q

What is thrust?

A

A push caused by an engine

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10
Q

What is lubrication?

A

a substance that reduces friction

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11
Q

What is compression?

A

To squash into a smaller space

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12
Q

What is extension?

A

The amount by which an object gets longer when a force us applied

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13
Q

What are balanced forces?

A

Forces acting on an object that are the same size but act in opposite directions. It stops movement

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14
Q

What is gravity?

A

a non-contact force between two masses

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15
Q

Weight=

A

mass ✕ gravitational field strength

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16
Q

What is a force?

A

A push or a pull

17
Q

What device do you use to measure force?

A

A Newton Meter

18
Q

What can forces make objects do?

A

Speed up, slow down, change direction, turn, change shape

19
Q

What is an unbalanced force?

A

Forces acting on an object that are different sizes but act in opposite directions. It causes movement

20
Q

What is a force diagram?

A

A diagram to show forces acting on a object

21
Q

What can you do with forces on the same line?

A

You can add or subtract forces

22
Q

A bus has 100N of thrust and 100N of air resistance. What is happening to the bus?

A

It is not accelerating. It moves slowly

100N-100N= 0N

23
Q

A plane has 100N of thrust and 500N of air resistance. What is happening to the plane?

A

It is strongly decelerating.

100N-500N= -400N

24
Q

A car has a rocket strapped to its roof. The rockets has 200N of thrust. The car has 50N of thrust. There is 20N of air resistance. What is happening to the car?

A

It is strongly accelerating.
200N+50N= 250N
250N-20N=230N

Science (11 decks)

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