AP Psychs AP Classroom practice test

B

D

A The sum of the kinetic energy and the gravitational potential energy changes by an amount equal to the energy dissipated by friction.

B

D all equal

1.5

C x>y

B, Px=Py

B, K2=K1

A, 1/3

A 800 kg/m³

C, same direction

C, 2

D, Fn is greater than mg

D, 1/4

A, decreasing gravity

B

A, 520J

B

B

D, 9

A

B, E2>E4

B, 2.4

C

C

A

D

C

D, 1/3

A, -1J

A

A, 1

A, 1.2×10³

C

B, momentum decreases because net external force

C

A, momentum decreases, top does torque

C, 2.4

A, right arrow

A

D

A, gravity only

B

B, 3

A, W1 < W2, cause area under curve

B

D, 4s

C, Fa>Fb, net force on B is zero

D, force is 90^o

C, 1:2

A

D, L>R>D

C, decrease mass on both

A

C, 1:4

B, straight up, decrease then increase

C

A, up to the right

C, 0

A

A

D

12 kgm²/s

D, F₁=2F₂

A

D, 4

C

D

12 kgm/s

3.4s

0.17m

D, A>B>C

B, T² function of L

B, 2500N

K_D=K_s cause gravity equal work

D

A, +x

B, 4m/s

C, Object R

D, 3

B, 1Nm

C

A, a/r

C

D

B

C, 3m

D

B

D

D

B

D

C, -0.43m

B, T₂=T₁

D

D, 10<t<15