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GCSE AQA Physics > P8: forces in balance > Flashcards

P8: forces in balance Flashcards

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1
Q

What is displacement?

A

A given Distance without change of direction.

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2
Q

What is a vector quantity?

A

A physical quantity witch has magnitude and direction.

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3
Q

What does a scalar quantity have?

A

A scalar quantity has a magnitude but no direction

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4
Q

What can a vector quantity be represented by?

A

An arrow in the direction of the vector and of length in proportion to the magnitude of a vector.

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5
Q

contact forces definition

A

If two objects must touch each other to interact.

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6
Q

What is Newton’s third law of motion?

A

When two objects interact with each other, hey exert equal and opposite forces on to each other.

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7
Q

What is the unit of force?

A

Newtons

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8
Q

Can forces change the shape of an object or change its motion or state if rest?

A

YES

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9
Q

What happens when two objects interact?

A

They always exert equal and opposite forces onto each other.

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10
Q

What is Newton’s first low of motion?

A

If forces acting on an object are balanced the resultant force is 0. The object will stay stationary if at a rest
- the object (if moving) will keep moving at the same speed and in the sane direction.

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11
Q

What does it mean when the resultant force is not 0?

A

The forces acting on the object are not balanced.

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12
Q

What happens when the resultant force is greater or less than zero?

A

The speed or direction of the object will change.

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13
Q

What does the centre of mass mean?

A

The centre of gravity, where the most gravity on the object is(usually in the middle).

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14
Q

Where is the centre of mass of a uniform ruler?

A

At its mid point

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15
Q

When an object is freely suspended and it comes to rest, where is its centre of mass?

A

Directly underneath the point of suspension.

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16
Q

Where is the centre of mass in a symmetrical object?

A

Along the axis of symmetry.

17
Q

What does equilibrium mean?

A

At a rest

Forces are balanced so constant spped could occur MUST CHECK

18
Q

What is a parallelogram of two forces?

A

A scale diagram of two force vectors.

19
Q

What is resultant force of a parallelogram?

A

The diagonal, it starts at the origin of the two forces.

20
Q

Why is an object at a rest in equilibrium?

A

Because the resultant force is 0

21
Q

What does resolving a force mean?

A

Finding the perpendicular components that have a resultant force equal to the force

22
Q

What are forces?

A

Vector quantities because they have direction and magnitude(size)

23
Q

What is a resultant force?

A

A single force with the same effect of all the original forces acting together.

24
Q

How do you work out the resultant force?

A

You subtract the smaller force from the larger force if directly opposite.

25
Q

What is magnitude?

A

No relation to distance or direction like the amount eg the size of an earthquake.

26
Q

What is a constant velocity?

A

A constant speed in a constant direction. A constant velocity means motion in a straight line at a constant speed.

27
Q

What is drag?

A

The forces that opposite the movement of an object.

28
Q

How do you know if a force is contact or non-contact?

A

Non contact forces are usually linked with some sort of field.

29
Q

Examples of contact forces:

A

Friction
Air resistance
Tension
Ect it is in CONTACT

30
Q

What are a few types of non-contact forces?

A

Gravitational force
Magnetic force
Electrostatics
Nuclear force

31
Q

What is the resistive force?

A

A force witch the direction is opposite to the velocity to the sum of the other forces.

32
Q

What is a free body diagram?

A

A diagram where the object is signified usually by a dot or box.

33
Q

What is a vector diagram?

A

Vector diagrams are simply diagrams that contain vectors. A vector is an arrow that represents a quantity with both magnitude and direction. The length of the arrow represents the magnitude (or size) of the quantity, and the direction of the arrow represents the direction.

34
Q

What is a parallelogram of two forces!

A

A to scale diagram of 2 force vectors

35
Q

Equilibrium

A

Resultant force =0

Forces acting on the object have NO overall turning effect.

36
Q

Law of moments

A

The longer the lever the less force you need.

force Fx distance

Turning force newtons cm

37
Q

Earths gravitational field?

A

Mass 100 g

Earth g=10 n/KG

38
Q

Resolving?

A

Get it back to horizontal and vertical

GCSE AQA Physics (17 decks)

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