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GCSE Physics > Forces And Statics > Flashcards

Forces And Statics Flashcards

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1
Q

What is a vector quantity?

A

When something has direction and magnitude.

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2
Q

What is a scalar quantity?

A

When something only has magnitude.

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3
Q

What are the two main categories of forces?

A

Contact Forces
Non-Contact Forces

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4
Q

What are non-contact forces?

A

One object can exert a force on another without even touching it. With all non-contact forces, the closer the objects, the stronger the force.

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5
Q

What are the three non-contact forces?

A

Electrostatic
Gravitational Force
Magnetic Force

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6
Q

What are contact forces?

A

When an object exerts a force on another with touching.

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7
Q

What are the five contact forces?

A

Reaction / Normal contact force
Tension
Friction
Drag (air and water resistance)
Upthrust

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8
Q

What apparatus do you use to measure the force needed?

A

Newtonmeter

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9
Q

Why does weight change on different planets?

A

Because different planets have different gravitational field strengths.

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10
Q

Why does mass not change on different planets.

A

Mass never changes because it is the amount of matter.

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11
Q

What is the equation for weight?

A

weight = mass x gravitational field strength
w=mg

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12
Q

What are the units for gravitational field strength?

A

Newtons/Kilogram
N/Kg

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13
Q

What are the units for mass when calculating weight?

A

Kilograms

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14
Q

What is the gravitational field strength on earth? (For GCSE)

A

10 N/Kg

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15
Q

What are balanced forces?

A

If two forces are equal in size but act in opposite directions they are balanced. The resultant force is 0, and the object will be stationary or travelling at a steady speed.

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16
Q

What are unbalanced forces?

A

There must be a stronger force acting on the object, and can change its speed, direction or shape.

17
Q

How can you tell if the forces on an object are balanced?

A

If the resultant force is 0.

18
Q

What is Newton’s first law of motion?

A

An object will remain at rest, or moving, continue at a constant velocity unless acted upon by a resultant force.

19
Q

What is Newton’s second law of motion?

A

If a resultant force acts on an object, it will accelerate in the direction of the resultant force according to the equation F=ma

20
Q

What is the resultant force?

A

The vector sum of all forces acting on the object. (the result of adding all the forces acting on an object, taking the direction into account)

21
Q

What is the equation that links mass, acceleration and force?

A

Force = mass x acceleration
F=ma

22
Q

What are the units for acceleration?

A

Metres per second per second
m/s/s OR m/s²

23
Q
A

GCSE Physics (10 decks)

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