A force of 20 N compresses an ideal spring with a spring constant 50 N/m. How much energy is stored in the spring?

• 2 J

• 5 J

• 4 J

• 6 J

• 8 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

A stone is dropped from the edge of a cliff. Which of the following graphs best represents the stone's kinetic energy KE as a function of time t?

• 
• 
• 
• 
• 

Tags

NGSS.HS-PS3-2

A driver in a 2000 kg Porsche wishes to pass a slow moving school bus on a 4 lane road. What is the average power in watts required to accelerate the sports car from 30 m/s to 60 m/s in 9 seconds?

• 1,800

• 5,000

• 10,000

• 100,000

• 300,000

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

A student pushes a box across a horizontal surface at a constant speed of 0.6 m/s. The box has a mass of 40 kg, and the coefficient of kinetic friction is 0.5. The power supplied to the box by the person is

• 40 W

• 60 W

• 150 W

• 120 W

• 200 W

Tags

NGSS.HS-PS3-1

Two projectiles A and B are launched from the ground with velocities as follows (angles wrt horizontal):

Projectile A: 50 m/s at 60 ̊

Projectile B: 50 m/s at 30 ̊

Assuming there is no air resistance involved, which projectile has greater kinetic energy when it reaches the highest point?

• projectile A

• projectile B

• they both have the same non-zero kinetic energy

• they both have zero kinetic energy at the highest point

• more information is required

Tags

NGSS.HS-PS3-2

An object with a mass of 2 kg is initially at rest at a position x = 0. A non-constant force F is applied to the object over 6 meters. What is the velocity of the object at 6 meters?

• 150 m/s

• 25 m/s

• 300 m/s

• 12.25 m/s

• more information is required

Tags

NGSS.HS-PS2-1

A block of mass m is placed on the frictionless inclined plane with an incline angle θ. The block is just in a contact with a free end on an unstretched spring with a spring constant k. If the block is released from rest, what is the maximum compression in the spring?

• kmg sinθ

• kmg cosθ

• 2mg sinθ /k

• mg/k

• kmg

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

NGSS.HS-PS3-1

A box of mass M begins at rest with point 1 at a height of 6R, where 2R is the radius of the circular part of the track. The box slides down the frictionless track and around the loop. What is the ratio between the normal force on the box at point 2 to the box’s weight?

• 1

• 2

• 3

• 4

• 5

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A 4.0 N force is used to accelerate a 2.0 kilogram block from rest to a velocity of 6.0 m/s. If the force was applied over a distance of 15 meters, the coefficient of kinetic friction between the block and the surface is most nearly

• 0.03

• 0.04

• 0.06

• 0.08

• 0.12

Tags

NGSS.HS-PS2-1

A 5 kg object slides 100 m down a frictionless inclined plane dropping 45 m. It then slides along a horizontal surface with a coefficient of kinetic friction of 0.75 until it stops. How long does it take to stop after it leaves the inclined plane?

• 3 s

• 4 s

• 6 s

• 12 s

• 15 s

Tags

NGSS.HS-PS2-1