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Physics > Midterm > Flashcards

Midterm Flashcards

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0
Q

Two skaters, an adult and a child, stand at rest on the ice, so their total momentum is zero. Then they push off each other. What happens s to their momentum so AFTER they push off of each other?

A

The total momentum of the two skaters is zero because the skaters have the same momentum, but in opposite directions

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1
Q

In a set, can a momentum be greater at the end of the experiment then it was at the beginning?

A

No. Throughout the experiment, the momentum stays the same as it was at the beginning. Only the velocity changes.

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2
Q

True or false: the total momentum BEFORE the collision is equal tho the momentum AFTER the collision.

A

True

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3
Q

How do you calculate the total momentum before the event?

A

M1(v1)+m2(v2)

So add the first mass times the first velocity to the second mass times the second velocity

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4
Q

How do you calculate the total momentum after the collision?

A

M1(v1)f+m2(v2)f=final momentum

Add the first mass x first velocity x force to the second mass x the second velocity x force

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5
Q

True or false
If you are changing the impulse of an object form 0 to a higher velocity, the longer you apply the force the greater the impulse, the amd the faster and object goes

A

True

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6
Q

What is conservation?

A

When the momentum before and after the collision is the same

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7
Q

What is explosion?

A

Objects start together but end apart

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8
Q

What are elastic collisions?

A

Objects start off apart, collide, and don’t stick

They start apart and end apart

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9
Q

What are non elastic collisions?

A

When objects start apart and end together

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10
Q

What is the “equation” of conservation of momentum?

A

P before collision = P after collision

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11
Q

What is centripetal force?

A

The force that keeps am object going in a circle

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12
Q

Define period

A

The time it takes to make an rotation

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13
Q

When a car is turning, what provides the centripetal force?

A

Friction

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14
Q

What provides the centripetal force when the earth is orbiting around the sun?

A

Gravity

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15
Q

Does a train going around in a circle at a constant speed have acceleration?

A

Yes; it is changing direction

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16
Q

Does a train going around in a circle at a constant speed change velocity?

A

Yes; it is changing direction

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17
Q

Which direction does the centripetal force always point?

A

To the middle

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18
Q

Which direction is the velocity pointing when an object is moving in a circle?

A

Perpendicular to the centripetal force

19
Q

Which spool of thread is moving faster, the one on the outside of the record player or the inside?

A

The spool of thread on the outside; it has a greater distance to cover for the same amount if time.

20
Q

Which spool of thread has a greater period, the one on the outside of the record player or the inside?

A

They have the same period

21
Q

What factors affect the force of gravity between two objects?

A

Mass and distance

22
Q

Does mass affect the force of gravity between two objects?

A

Yes

23
Q

If you double the mass of one object, what happens to the force of gravity between the two objects?

A

It increases by a fourth

24
Q

If you double the mass of both objects, what happens to the force of gravity between the two objects?

A

It doubles

25
Q

If you double the distance between two objects what happens to the force of gravity between them?

A

It decreases by half

26
Q

If you half the distance between two objects, what happens to the force of gravity between them?

A

It increases by a fourth

27
Q

Why can’t you feel the force of gravitational pull between you and an apple?

A

The mass is too small

28
Q

If you are in space, orbiting the earth, is there a force of gravity on you?

A

Yes.

29
Q

If you are in space, orbiting the earth, why do you feel weightless

A

Because there is no Fn acting on you

30
Q

What is Newton’s first law?

A

An object at rest stays at rest unless acted upon by an outside force, and an object in motion continues in a straight line at a constant velocity unless acted upon by outside forces.

31
Q

Of you were in a spaceship, and fired a 15kg cannonball into frictionless space, after you fires the cannonball, how much force would you need to apply to keep it moving?

A

None, as there is no Ff to slow it down

32
Q

What is the definition of inertia?

A

An object’s resistance to a change of motion

33
Q

A car is moving at a constant velocity. What is the net force acting on it?

A

0

34
Q

What is miu?

A

The coefficient of friction

35
Q

What is miu affected by?

A

Surface texture and weight

36
Q

Is miu affected by surface area?

A

No

37
Q

What is air resistance?

A

Friction caused by air

38
Q

What is air resistance NOT affected by?

A

Weight

39
Q

What is air resistance affected by?

A

Surface area, aerodynamics, air density, and velocity

40
Q

What is Newton’s second law?

A

Net force= mass x acceleration

41
Q

Compare velocity and acceleration

A

Velocity is: how fast

Acceleration: how fast velocity CHANGES.

42
Q

Two identical cars are traveling T 25mph. The first cars stops in 1s because it hits the wall. The second car stops in 5s because the driver hit the brakes. Which car has a greater change in momentum?

A

The change in momentum a are equal, because both start at 25mph, and end at 1.

43
Q

Two identical cars are traveling T 25mph. The first cars stops in 1s because it hits the wall. The second car stops in 5s because the driver hit the brakes. What has a greater impulse, the brakes or the wall?

A

The impulses are the same

44
Q

When doing problems on universal gravitation, and the question is talking about halving or multiplying the distance, what equation can you use?

A

(d1/d2) squared

Physics (4 decks)

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