Forces And Their Effects (paper1) Flashcards

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1
Q

What are used instead of machines in many parts of the world

A

Animals

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2
Q

When is energy transferred

A

Whenever things happen

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3
Q

When can energy also be transferred

A

When a force makes something move

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4
Q

What is the energy transferred by a force called

A

Work done

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5
Q

What does work done depend on

A

The size of the force and how far the forced moved

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6
Q

What is the work done equation

A

Work done = force x distance moved in the direction of the force

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7
Q

What is power

A

The rate at which energy is transferred

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8
Q

What is power measured in

A

Watts

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9
Q

What does 1 watt equate to

A

1 joule of work done

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10
Q

What is the power equation

A

Power = work done divided by time taken

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11
Q

How can objects interact

A

By exerting forces on one another

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12
Q

What are the forces if the objects are touching

A

Contact forces

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13
Q

Give an example of a normal contact force

A

The floor upwards forcing against your weight

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14
Q

What is upthrust balanced by

A

Gravity

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15
Q

What type of force is gravity

A

Non-contact force

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16
Q

When does gravity occur

A

Between any two objects that have a mass

17
Q

How does the moon stay in orbit around the earth

A

Because the two bodies are attracting each other

18
Q

The force from the moon on the earth is the same as what

A

The force from the earth on the moon

19
Q

What direction are the forces between the earth and moon going in

A

Opposite directions

20
Q

How can the gravitational forces between two objects with a mass be shown

A

Using vectors

21
Q

What are vectors

A

Arrows that show both direction and magnitude

22
Q

What’s an action-reaction force

A

Pairs of forces acting on different objects in opposite directions

23
Q

What is a force field

A

The space around an object where it can affect other objects

24
Q

Name some fields

A

Gravitational, magnetic, electric

25
Q

What does an object charged with static electricity have

A

An electric field

26
Q

What can a magnet attract

A

Objects that have magnetic materials

27
Q

What is it called the forces are equal in size but in opposite directions

A

Resultant forces or net force

28
Q

Are forces acting on an object always acting along the same line

A

No

29
Q

How could we figure out how much thrust is pushing a plane forwards and upwards

A

By resolving the thrust force into two component forces that are right angles to each other

30
Q

What is a turning force called

A

A moment

31
Q

What does the moment of a force depend on

A

The size of the force and where the force is applied

32
Q

How can we greater a greater moment

A

The further away from the pivot and and the greater the force applied

33
Q

How is the distance between the force and the pivot measured

A

Normal to the direction of the force

34
Q

What is the equation for the moment of the force

A

Moment of a force = force x distance normal(perpendicular) to the direction of the force

35
Q

What something is balanced, it is said to be in what

A

Equilibrium

36
Q

What is the equation for when a system involving rotational forces is in equilibrium

A

Sum of clockwise moments = sum of anti-clockwise moments

37
Q

What is the horizontal line/beam called

A

Lever

38
Q

What is a lever

A

A bar that pivots about a point and used to transfer a force

39
Q

How can the rotational effect of a force also be transmitted

A

By gears