A 31-kg mass is accelerated by a net force of 81 N. What is the acceleration of the mass?

• 2.6 m/s²

• 10 m/s²

• 0.39 m/s²

• 0.25 m/s²

• 4 m/s²

Tags

NGSS.HS-PS2-1

How much does a 29-kg weigh on the surface of the moon (where the acceleration of gravity is 1/6th that of Earth)?

• 47.4 N

• 284.2 N

• 19.6 N

• 290 N

• 4.8 N

Tags

NGSS.HS-PS2-1

A spring with a stiffness constant k = 55 N/m has a natural length of 0.55 m. Is is attached to the top of an incline that makes a 30 degree angle with the horizontal. The incline is 2.4 m long. A mass of 2 kg is attached to the spring, causing it to be stretched down the incline. How far down the incline does the end of the spring rest?

• 0.746 m

• 0.354 m

• 0.646 m

• 0.55 m

• 1.85 m

Tags

NGSS.HS-PS2-4

A mass, M, is released from rest on an incline that makes a 40 degree angle with the horizontal. In 5 seconds, the mass is observed to have gone a distance of 2 m. What is the coefficient of kinetic friction between the mass and the surface of the incline?

• 0.97

• 0.7

• 0.86

• 1.2

• 2.55

Tags

NGSS.HS-PS2-1

A 70 kg acrobat hangs from a bar, motionless, that is attached to the ceiling by two ropes. Find the tension in each rope.

• 70 N
• 686.7 N
• 343.35 kg
• 343.35 N

Tags

NGSS.HS-PS2-1

Which of the following is true about the system shown?

• The system is not accelerating.
• The tension between m₂ and m₁ is less than the tension between m₂ and m₃
• The acceleration of the system only depends on m₃
• None of the other answers are true

Tags

NGSS.HS-PS2-1

Which of the following statements is true about the image above?

• The accelerations of the blocks will vary according to their mass

• The net force acting on each block is the same

• The blocks will experience the same acceleration

• The 3m box will eat the 2m and the m boxes

Tags

NGSS.HS-PS2-1

Calculate the gravitational force of attraction between a 1,819-kg car and a 10,200-kg truck, separated by a distance of 0.25 m.

• 2 x 10^-2 N

• 6.4 x 10^-3 N

• 2 x 10² N

• 9 x 10^-5 N

• 5 x 10^-4 N

Tags

NGSS.HS-PS2-4

If the gravitational force between two masses is F, then by what factor would the distance between the two object need to change if the mass of one of the objects is doubled in order for the force to remain the same?

• 4

• 2

• sqrt(2)

• sqrt(6)

Tags

NGSS.HS-PS2-4

What does the strength of gravity between two objects depend upon?

• Mass & distance
• Mass & weight
• Gravity & inertia
• Inertia & mass

Tags

NGSS.HS-PS2-4