Momentum Flashcards

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0
Q

What is momentums unit

A

Kg m/s

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1
Q

What equation is used to work out momentum

A
Momentum = mass x velocity
P= m x v
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2
Q

What is meant by conservation of momentum

A

Momentum before collision= momentum after collision

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3
Q

What is momentum

A

Momentum is a quantity possessed by masses in motion

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4
Q

What kind of a quantity is momentum

A

Momentum is a vector quantity meaning it has both magnitude and direction

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5
Q

How do you calculate inc in momentum

A

Force x time= inc in momentum

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6
Q

What is meant by an elastic collision and give an eg

A

An elastic coll. = a collision in which no KE Is lost by beig transformed into other forms if energy
Eg gas particles Colliding with conatinee

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7
Q

What happens when only some KE Is lost in a collision and give an eg

A

When a ball bounces some is transformed into sound and heat

Called partially elastic

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8
Q

What is an inelastic collision

A

When two objects collide and stick together

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9
Q

What is an explosion collision

A

When a release of energy causes things to fly apart

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10
Q

What car safety features are there to protect people from crashes

A

Air bags- inflate v fast, cushions passengers head and deflates when head impacts on it , inc collision time
Crumple zones- area at front and back of car which is designed to crumple easily, dissapating the energy of he impact, inc collision time so dec force exerted on the passenger
Seatbelts- inertia reel safety belts lock in place to keep passenger tightly pressed to seat, also slightly elaticated so inc coll. time and dec impact

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11
Q

How do you work out velocity

A
         Time taken
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12
Q

How do you work out the force of a collision

A

Force = change in momentum /time taken

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