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Physics > Newton's Laws > Flashcards

Newton's Laws Flashcards

1
Q

What is mass?

A

A measure of the amount of matter something is made up of. It is a scalar measurement.

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2
Q

What is mass measured in?

A

Kilograms

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3
Q

What is weight?

A

The force experienced by all mass because of gravity.

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4
Q

What is the gravitational field strength for Earth?

A

10N/Kg

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5
Q

How many grams in a newton?

A

100g

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6
Q

What is Newton’s first law?

A

A body will continue in a state of rest or uniform motion in a straight line unless acted upon by a resultant force.

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7
Q

What does every object have?

A

Inertia

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8
Q

Is inertia a force?

A

No

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9
Q

What must Newton’s first law have?

A

No resultant force

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10
Q

What is Newton’s second law?

A

The acceleration of an object is directly proportional to the resultant force acting on it.

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11
Q

What is the formula for Newton’s second law?

A

Resultant Force = Mass x Acceleration
F = M x A

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12
Q

What is Newton’s third law?

A

For every action force there is an equal and opposite reaction force. Action and reaction forces act on different bodies.

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13
Q

What does the resultant force cause?

A

The change in motion of the object.

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14
Q

Why does air resistance happen?

A

Due to the force the moving object has to exert to push the air out of the way.

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15
Q

What does the size of the air resistance depend on?

A

The speed of the object, its area of cross section and its shape.

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16
Q

How can you reduce the drag force?

A

By making the object more streamlined/aerodynamic.

17
Q

If a skydiver jumps out of a plane on Earth what is its initial acceleration?

A

10m/s as they accelerate at the gravitational field strength.

18
Q

When the skydiver maintains a constant speed this is known as?

A

Terminal Velocity

19
Q

What is the upwards force for a skydiver?

A

Air resistance

20
Q

What is the downwards force for a skydiver?

A

Weight

21
Q

Why does a rocket speed up?

A

As it burns fuel the weight decreases so the acceleration increases

22
Q

What is weight measured in?

A

Newtons

23
Q

What is the gravitational field strength measured in?

A

N/Kg

24
Q

What is acceleration measured in?

A

m/s²

Physics (8 decks)

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