UNIT 1 - Dynamics Flashcards

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1
Q

What is newtons 1st law

A

An object remains at rest or constant speed unless acted upon by an external force

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2
Q

What is newtons second law

A

The rate of change of momentum of an object is proportional to the resultant force acting on it, and takes place in the direction of that force

F = MA

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3
Q

What is Newtons 3rd law?

A

Every action has an equal and opposite reaction

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4
Q

What does force mean and how does it relate to momentum

A

A push or pull acting on a body causing motion of a body

Can be defined as a change of momentum per unit time
F = change in momentum/time

(Newtons, N)

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5
Q

Define resultant force

A

The vector sum of the forces on the object

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6
Q

What is mass?
What is unit of mass?
Does it stay the same?

A

-A measure of matter
-kilograms (kg)
-always the same

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7
Q

What is weight?
What is units of weight?
Does it stay the same?

A

-A force due to gravity
-Newtons (N)
-Changes depending on gravitational field

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8
Q

What is equation for weight

A

Weight = mass x gravity
W = mg
(N) = (kg)(ms⁻²)

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9
Q

What causes gravity

A

The attraction of mass between two objects

(Causing them to accelerate to each other resulting in the curvature of space-time around massive objects) <— just to understand

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10
Q

Define linear momentum

A

It is the product of its mass and its velocity

P = mv

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11
Q

How does the direction of momentum relate to the direction of velocity

A

They are the same, direction of the momentum is in the same direction as the velocity

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12
Q

Define Newton

A

1 newton is the force required to accelerate a mass of 1kg by 1ms⁻² in the direction of the force

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13
Q

What is the principle of conservation of momentum

A

The vector sum of the momentum of bodies in a system stays constant even if forces act between the bodies, provided there is no external resultant force

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14
Q

Define terminal velocity

A

The constant and maximum velocity, when resistive forces acting on object is equal and opposite to accelerating forces acting on object.

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15
Q

What is elastic collision

A

A collision in which there is no change in total kinetic energy

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16
Q

What is inelastic collision?

A

A collision in which kinetic energy is lost