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PHYSICS > DYNAMICS > Flashcards

DYNAMICS Flashcards

1
Q

What is inertia?

A

How hard it is to change the motion of an object

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2
Q

What is Newton’s 1st law?

A

A body will remain at rest, or continue to move with a constant velocity if forces are balanced

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3
Q

What does Newton’s 1st law tell us about objects moving at a constant velocity?

A

Resultant force = zero (balanced forces)

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4
Q

What is a resultant force?

A

Overall force acting on an object

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5
Q

What is Newton’s 2nd law?

A

Rate of change of momentum is proportional to resultant force ΣF=Δp/t (ΣF=ma)

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6
Q

What is Newton’s 3rd law?

A

If object A exerts a force on object B, then object B exerts an equal and opposite force on object A

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7
Q

If a bat pushes a ball forwards with 400N what does the ball do?

A

Ball pushes the bat backwards with 400N

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8
Q

Describe how Newton’s 3rd law applies to a rocket?

A

Exhaust fumes exert a force down on ground, ground exerts an equal and opposite force up on the rocket

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9
Q

What is the definition of mass?

A

How much matter (stuff) is in an object

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10
Q

What is the definition of weight?

A

Force due to gravity on an object

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11
Q

What is the equation that links weight and mass?

A

Weight = mass x gravitational field strength (W=mg)

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12
Q

What is the equation to calculate momentum?

A

Momentum = mass x velocity (p=mv)

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13
Q

What unit is used for momentum?

A

kgms⁻¹ or Ns

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14
Q

What is the law of conservation of momentum?

A

Total momentum before interaction = total momentum after interaction if there are no external forces acting

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15
Q

What equation links force and momentum?

A

Force = change in momentum / time (F=Δp /t)

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16
Q

What is an elastic collision?

A

Collision where there is no change in total kinetic energy

17
Q

What is an inelastic collision?

A

Collision where kinetic energy is lost

18
Q

What does the gradient of a momentum-time graph represent?

A

Force

19
Q

What is the N3 pair for the Earth’s force of gravity pulling you? down

A

You pulling the Earth up

PHYSICS (11 decks)

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