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Physics > Forces > Flashcards

Forces Flashcards

1
Q

What are forces?

A

Forces are pushes and pulls that occur when objects interact.

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2
Q

Can you see a force?

A

We can see the effects of the forces but not the forces themselves.

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3
Q

What are contact forces?

A

Forces that only occur when objects are touching.

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4
Q

What are some contact forces?

A

-Friction
-normal contact force
-air resistance
-upthrust

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5
Q

What are non-contact forces?

A

Forces that can occur over a distance.

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6
Q

What are some non-contact forces?

A

-weight
-magnetic
-electrostatic

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7
Q

How are forces represented on diagrams?

A

Forces are represented on diagrams by using a scaled arrow.

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8
Q

What does a dot represent in a free body diagram?

A

The object

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9
Q

How is the object represented in a free body diagram?

A

A dot

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10
Q

Which direction do the arrows point in a force diagram?

A

The arrows should point in the direction of the force

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11
Q

What does it mean when forces are balanced?

A

When forces acting in opposite directions are the same size we say the forces are balanced

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12
Q

What happens to a stationary object when the forces on it are balanced?

A

It remains stationary.

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13
Q

What happens to a moving object when the forces on it are balanced?

A

It moves with constant speed.

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14
Q

What does it mean when forces are unbalanced?

A

When forces acting in opposite directions are NOT the same size we say the forces are unbalanced

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15
Q

What happens when the forces on an object are unbalanced?

A

An object can speed up, slow down or change direction.

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16
Q

When will an object float?

A

If the upthrust can equal the weight.

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17
Q

When will an object sink?

A

When the weight is greater than the upthrust

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18
Q

If the overall density of an object is greater than that of the liquid it will _____

A

sink

19
Q

How can you change if an object floats or sinks?

A

Changing the shape of the object (to include air) or the temperature/density of the liquid.

20
Q

What else can you call air and water resistance?

A

Drag force

21
Q

Drag force is in the ________ direction to the movement

A

Opposite

22
Q

How can you increase the drag force of an object?

A

-Larger surface area
-moving faster
-moving through a more viscous liquid

23
Q

How can you decrease the drag force of an object?

A

streamline the object

24
Q

How does a parachute work?

A

A parachutist will accelerate towards the ground when their weight is bigger than air resistance (unbalanced). When air resistance is the same size as weight it will move at a constant speed (balanced). Opening a parachute increases air resistance and it slows the parachutist down (unbalanced).

25
Q

What is mass

A

The amount of matter an object is made from.

26
Q

How do you measure mass

A

In kilograms, kg

27
Q

What is weight

A

the force when gravity is acting on a mass.

28
Q

How is weight measured?

A

In Newtons, N

29
Q

What is the word equation for weight?

A

weight = mass x gravitational field strength

30
Q

Is weight variable or constant

A

Weight varies with gravitational field strength.

31
Q

Is mass variable or constant

A

Mass will always be constant

32
Q

All objects with mass have a…

A

gravitational pull

33
Q

Objects with more mass (like planets) have a greater or lesser gravitational pull

A

greater

34
Q

Is the gravitational pull stronger nearer or further from the object?

A

Nearer (on Earth’s surface rather than orbiting).

35
Q

Friction occurs when…

A

One surface moves along another

36
Q

A rough surface will cause a _______ friction force than a smooth surface.

A

larger

37
Q

Is friction the same or opposite direction to movement?

A

Opposite direction

38
Q

How can you reduce friction?

A

By using lubrication such as oil.

39
Q

How is friction useful?

A

It stops us falling over.

40
Q

How is friction unhelpful?

A

It causes surfaces to wear away and heat up

41
Q

How does a Newton meter work?

A

A pulling force like weight will stretch a spring

42
Q

Forces can change the shape of an object by…

A

Stretching (extending) or compressing (squashing)

43
Q

Ir order to get reliable results, only one _______ should be changed during an experiment

A

variable

44
Q

A spring will stretch proportionally to the force applied. This means that if the force is doubled, the length it extends…

A

doubles.

Physics (5 decks)

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