Unit 2 – Force and Translational Dynamics

/ Unit 2 – Force and Translational Dynamics

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You’ll revisit the concepts you worked with in Unit 1 to explore force, which is the interaction of an object with another object.

Question Difficulty:

Question	Difficulty	Students Solved
Constant Gravitational Acceleration	medium	52
Identifying Translational Equilibrium	medium	51
Net Force From Internal Forces	medium	49
Evidence for the Equivalence Principle	medium	34
Gravitational Force and Mass	medium	39
Uniform Gravitational Field Assumption	medium	26
Equivalence of Gravitational and Inertial Mass	medium	30
Center of Mass Model Limitations	hard	33
Internal and External Forces on a System	medium	24
Mass-Spring Oscillator Period	medium	23
Impulse Exerted During a Collision	medium	19
Center of Mass Velocity in an Atwood Machine	medium	20
Conservation of Momentum in an Explosion	medium	23
Center of Mass of a Particle System	medium	11
Gravitational Force and Orbital Radius	easy	16
Condition for Constant Velocity	easy	21
Center of Mass of a Three-Object System	medium	13
Fundamental Cause of Contact Forces	medium	13
Kinetic Versus Static Friction	easy	14
Forces on an Accelerating Car	medium	15

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Rank	User	Correct Count	Attempt Count	Time	Score
#1	dpaak0903	172	200	0m 00s	16,920
#2	dxie26808	158	261	0m 00s	14,770
#3	shakthi.durai11	29	33	0m 00s	2,860
#4	jchenlisg	21	25	0m 00s	2,060
#5	dhithyaram	19	26	0m 00s	1,830
#6	nmtnice2010	18	19	0m 00s	1,790
#7	siyeonkim4837	19	31	0m 00s	1,780
#8	yomoye.dele	18	23	0m 00s	1,750
#9	leoguinea0611	18	36	0m 00s	1,620
#10	karpuzarya	13	15	0m 00s	1,280

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