AP Physics Review 4

A ball of mass 0.4 Kg is initially at rest on the ground.  It is kicked and leaves the kicker's foot at a 60 degree angle above the horizontal at 5 m/s.  The magnitude of the impulse imparted by the foot to the ball is

• 1  1 N * s 
• 2  2 N * s 
• 3  3 N * s
• 4  4 N * s 

Tags

NGSS.HS-PS2-1

A rock of mass m is thrown horizontally off the top of a cliff of height h, as shown in the diagram.  The speed of the rock as it leaves the throwers hand is v.
How much time does it take for the rock to hit the ground?

• √hv
• h/√gv
• √(h/mg)
• √(2h/g)

What is the kinetic energy of the rock just before it hits the ground?

• mgh
• 1/2mv²
• 1/2mv² - mgh
• 1/2mv² + mgh

Tags

NGSS.HS-PS3-2

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

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

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

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-PS3-2

How much work is done carrying a 10-N box horizontally across a floor for 8 m?

• 80 J
• 10 J
• 8 J
• 0 J

You do work against gravity when you walk up some stairs.

• True

• False

Tags

NGSS.HS-PS2-4