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Study > Forces > Flashcards

Forces Flashcards

1
Q

What is a balanced force?

A

An equal push on both sides of an object which results in no change in motion

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2
Q

What is an unbalanced force?

A

An unequal push on one side of an object which results in a change in motion

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3
Q

The force that resists motion when two surfaces rub against each other

A

Friction

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4
Q

What does friction generate?

A

Heat

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5
Q

All forces are measured in…

A

Newtons (N)

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6
Q

List some examples of contact forces

A

Friction
Air resistance
Reaction Force
Upthrust

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7
Q

What is a force?

A

A push or a pull

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8
Q

The force of water pushing a boat up is called…

A

Upthrust

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9
Q

A force that acts without touching is called a…

A

Non-contact force

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10
Q

What do we use to measure force?

A

Newton Meter

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11
Q

How do we show forces acting on an object?

A

We add arrows to it

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12
Q

What effect can forces have on objects?

A

Change their shape (deform)

Change the direction the object moves in

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13
Q

List 3 non-contact forces

A

Gravitational force
Magnetic force
Electrostatic force

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14
Q

What is the scientific word for changing shape?

A

Deform

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15
Q

When a stretched string pulls back we call it…

A

Tension

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16
Q

The force of the Earth pushing an object up is called the…

A

Reaction force

17
Q

The amount that a spring can stretch is called its…

A

extension

18
Q

If you stretch a spring so long that it can no longer go back to its original size we say that the spring has reached its…

A

elastic limit

19
Q

If an object (e.g. a spring) doubles in length when you double the force on it we say that it obeys…

A

Hooke’s Law

20
Q

True or false, rough surfaces have more friction

A

True

21
Q

Smooth surfaces have ____ friction

A

less

22
Q

Name the two drag forces.

A

Air resistance
Water Resistance

23
Q

How do you reduce friction between 2 objects?

A

Lubrication E.g. oil

24
Q

What is weight?

A

The force that an object (or person) pushes into the Earth as a result of gravity

25
Q

What is mass?

A

The amount of stuff that an object is made from

26
Q

What is the equation for weight on any planet?

A

Weight (N) = Mass (KG) x Gravitational Field Strength (N/kg)

27
Q

What are the names of the 3 types of force field?

A

Magnetic fields

Gravitational fields

Electrostatic force fields

28
Q

When forces acting on an object are the same size in opposite directions we say that they are…

A

Balanced

29
Q

If forces acting in opposite directions are not the same size, we say that they are…

A

Unbalanced

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