Motion And Energy Flashcards

1
Q

Speed

A

Distance / time

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2
Q

Difference between speed and velocity

A

Velocity is a speed in a certain direction

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3
Q

Acceleration

A

Change in velocity / time

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4
Q

Inertia

A

U inform motion

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5
Q

Newton’s first law

A

Object stays at rest unless acted on by an unbalanced force

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6
Q

Momentum

A

Mass x velocity

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7
Q

Conservation of momentum

A

Cannot be created or destroyed

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8
Q

Newton’s second law

A

Force = mass x acceleration

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9
Q

Force =

A

Rate of change of momentum

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10
Q

Weight

A

Mg

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11
Q

Gfs

A

10N/kg

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12
Q

Terminal velocity involves what forces

A

drag force of resistance

Gravitational pull

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13
Q

Newton’s third law

A

Every action there is an equal and opposite reaction

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14
Q

Work equ

A

Force x distance moved in direction of force

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15
Q

Work done ?

A

Transfer of energy

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16
Q

PotentiaL energy

A

Mgh

17
Q

What do crumple zones and road safety do

A

Decrease stopping distances

18
Q

Power =

A

Energy transfer / time

19
Q

Percentage efficiency

A

Useful output / input x 100