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newton laws Flashcards

(21 cards)

1
Q

state newton’s first law

A

an object’s motion will not change unless acted upon by an unbalanced force

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2
Q

what is the name for objects’ tendency to continue in their state of motion?

A

inertia

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3
Q

if the resultant force is 0N, the forces are. . .

A

balanced

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4
Q

if the resultant force is 0N, the object is in. . .

A

equilibrium

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5
Q

what will happen to a stationary object if the resultant force is 0N?

A

it will remain stationary

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6
Q

what will happen to an object in motion if the resultant force is 0N?

A

it will continue moving at the same velocity

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7
Q

what will happen to a stationary object if the resultant force is not 0N?

A

it will accelerate in the direction of the resultant force

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8
Q

what will happen to an object in motion if the resultant force is not 0N?

A

it will accelerate in the direction of the resultant force

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9
Q

the resultant force is greater than 0N, what do we call the pair of forces?

A

unbalanced

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10
Q

if a car starts to slow down, what will the resultant force be like?

A

it will have a resultant force greater than 0N in the backwards direction

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11
Q

why might a bigger truck need a greater engine force to accelerate
as much as a smaller truck?

A

it has greater mass so it needs a greater force to accelerate as much as the smaller truck

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12
Q

wow can you tell that an object is in equilibrium?

A

when all forces acting upon an object are equal/balanced

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13
Q

state newton’s third law

A

every action has an equal and opposite reaction

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14
Q

what is the pair of forces acting in this scenario? (a car driving on the road)

A

the tyres exert a force on the road and the road exerts an equal and opposite force on the tyres

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15
Q

what is the pair of forces acting in this scenario? (a girl pushing off on her skateboard)

A

the foot exerts a force on the ground and the ground exerts an equal and opposite force on the foot

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16
Q

what is the pair of forces acting in this scenario? (someone swimming in the water)

A

the swimmer exerts a force on the water and the water exerts an equal and opposite force on the swimmer

17
Q

state the definition of a reactant force

A

a force acting in the opposite direction

18
Q

if forces are equal and opposite the resultant force will be. . .

19
Q

why can you float on water?

A

you float because you exert a force on the water and the water exerts an equal and opposite force on you

20
Q

if a large person and a small person bump into each other what can be said about the forces they exert on each other?

A

they will exert the same size force on each other

21
Q

the reaction force to the force exerted by a gun on a bullet is. . .

A

the force exerted by the bullet on the gun