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AP Exam Review > Physics Things to Know > Flashcards

Physics Things to Know Flashcards

1
Q

How do you determine instantaneous velocity from a position-time graph?

A

Slope at a given time

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2
Q

How do you determine instantaneous velocity from a velocity-time graph?

A

Value at the given time

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3
Q

A block is in equilibrium. What is the Newton’s third law force pair to the normal force?

A

The force the block puts on the surface

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4
Q

What is the same for resistors in parallel?

A

Voltage drop

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5
Q

What is the equivalent resistance of two 50 ohm resistors in parallel?

A

25 ohms

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6
Q

What is the more common word for the “magnitude of the velocity vector?”

A

Speed

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7
Q

Write the impulse-momentum theorem.

A

FΔt = Δp

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8
Q

State the formula for the angular momentum of a point object.

A

L = mrv

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9
Q

State the formula for the angular momentum of an extended object, like a disk or a sphere.

A

L = Iω

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10
Q

A 1 kg object moves at 2 m/s. Can this object collide and experience MORE that 2 N᛫s of impulse?

A

Yes

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11
Q

What property of a circuit involved the number of electrons passing a position in 1 s?

A

Current

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12
Q

John exerts a 4 N force to the left on a cart; Peggy exerts a 3 N force to the right on the cart. Which way is the cart moving?

A

Can’t be determined

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13
Q

What physical property of a wave relates to the energy carried by the wave?

A

Amplitude

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14
Q

Under what conditions can you set up forces equal to down forces?

A

Equilibrium (a = 0)

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15
Q

Equation for energy stored by a spring.

A

PE = 1/2 kx²

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16
Q

A 1 kg wooden crate and a 2 kg wooden crate are separately dragged across the floor. What quantity must be the same for both crates?

A

Friction (μ)

17
Q

Write the equation for the electrical force between two point charges.

A

F = (kq1q2) / r²

18
Q

Two massive objects each have a net negative charge. When they are placed near one another, do they attract or repel electrostatically?

A

Repel

19
Q

Write the equation for the period of a pendulum.

A

T = 2π √(l/g)

20
Q

Write two versions of the equation for electrical power.

A 
P = IV
P = I²R
P = V² / R
21
Q

Wire 1 is 20 cm long and made out of aluminum. Wire 2 is 40 cm long, of the same cross sectional area, and also made out of aluminum. How many times larger is the resistivity of wire 2 compared to wire 1?

A

Resistivity is the same.

22
Q

The amplitude of an antinode on a standing wave on a string is 2 cm; the period of the wave is 4 s. What is the average speed of the string at the position of the antinode?

A

2 cm/s

23
Q

Draw a representation of the longest-wavelength standing wave that can exist in a pipe which is open at one end and closed at the other end.

A

Half a wave

24
Q

A planet’s orbit about a sun is elliptical. Consider a system consisting of just the planet. Is the planet’s angular momentum about the sun conserved?

A

No

25
Q

An object is hung from a spring scale, which reads 2.0 N. Dividing by 10, it’s determined that the object’s mass is 0.2 kg. Which kind of mass was determined?

A

Gravitational Mass

26
Q

An object is attached to a horizontal spring, compressing the spring by 0.15 m. A second object, twice as massive as the first, compressed the same spring by 0.15 m. By how much has the potential energy of the spring-object system changed?

A

None

1/2kx²

27
Q

A 10 N block is on a surface is which the static friction coefficient is 0.2. The force of friction on the block is 1 N. How is this possible?

A

F (static friction) ≤ μ (static) F (normal)

28
Q

Identify the error: “Ball A was thrown at a speed of 30 m/s at an angle of 20° above the horizontal. Since its acceleration is 10 m/s², its speed after 3 s will be zero.”

A

Acceleration is in the vertical direction. Only Ball A will have a non-zero speed.

29
Q

Why is it wrong to say “the kinetic energy of the hanging block is downward?”

A

Energy is secular with no direction

30
Q

Define an “elastic” collision.

A

No loss of kinetic energy; object bounces perfectly

AP Exam Review (3 decks)

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