AP Physics Unit 3

A rod on a horizontal tabletop is pivoted at one end and is free to rotate without friction about a vertical axis, as shown in the diagram.  A force F is applied at an angle θ to the rod.  If F were to be applied perpendicular to the rod, at what distance from the axis should it be applied in order to produce the same amount of torque?

• L sin θ

• L cos θ

• L 

• L tan θ

A ball is suspended by a lightweight string, as shown in the figure.   The ball is displaced to position 1 and released. The four labelled positions are evenly spaced along the arc of the ball's motion.  
Between which adjacent pairs is the gain in kinetic energy the greatest?

• 1 and 2

• 2 and 3

• 3 and 4

• They are all equal

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A solid metal ball and a hollow plastic ball of the same external radius are released from rest in a large vacuum chamber.  When each has fallen 1m, they both have the same

• Speed

• Inertia

• Change in Potential Energy

• Momentum

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A student weighing 700 N climbs at a constant speed to the top of an 8m verticle rope in 10 s.  The average power expended by the student to overcome gravity is most nearly

• 1.1 W

• 87.5 W

• 560W

• 875 W

Tags

NGSS.HS-PS2-4

Three forces act on an object.  If the object is in translational equilibrium, which of the following must be true:
i. The vector sum of the three forces must equal zero.
ii. The magnitude of the three forces must be equal.
iii. All three forces must be parallel.

• i only

• ii only

• i & iii only

• i, ii, & iii only

Tags

NGSS.HS-PS2-1

The electrical resistance between X and Y is

• 3/4 Ω

• 1 1/3 Ω

• 2 Ω

• 4 Ω

The figure above shows two particles, each with a charge of Q+, that are located at the opposite corners of a square with a side d.
What is the direction of the net electric field at point P.

•  ↖

• ↗

• ↘

• ↙

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor. The coefficient of friction between the box and floor is μ. At what rate does a child do work on the box?

• μmgv

• v/μmg

• μmg/v

• μmv²

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

The maximum speed of the electrons emitted by a metal surface when it is illuminated by light depends on which of the following?

• I only

• III only

• I and II only

• II and III only

• all of the above

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

An open cart on a level surface is rolling without frictional loss through a verticle downpour of rain, as shown in the figure. As the cart rolls, an appreciable amount of the rainwater accumulates in the cart. The speed of the cart will

• increase because of conservation of mechanical energy

• decrease because of conservation of momentum

• decrease because of conservation of mechanical energy

• remain the same because the raindrops are falling perpendicular to the direction of the cart's motion

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2