PERIODIC MOTION

A spring has a spring constant of 256 N/m. How far must it be stretched to give it an elastic potential energy of 48 J?

• 0.24 m

• 0.61 m

• 0.20 m

• 0.12 m

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A spring stretches 0.12 m when some apples are weighing ( 3.2 N) suspended from it, as shown in the figure. What is the spring constant of the spring?

• 27

• 54

• 108

• 216

Each of the coil springs of a car has a spring constant of 25,000 N/m. How much is each spring compressed if it supports one-fourth of the car’s 12,000-N weight?

• 0.48 m

• 0.24 m

• 0.12 m

• 0.6 m

Tags

NGSS.HS-PS2-1

How long must a pendulum be to have a period of 2.3 s on the Moon, where g = 1.6 N/kg?

• 1.68

• 0.84 m

• 0.42 m

• 0.21 m

Tags

NGSS.HS-PS2-4

Rank the following pendulums according to period, from least to greatest. Specifically indicate any ties.

A. 10 cm long, mass = 0.25 kg

B. 10 cm long, mass = 0.35 kg

C. 20 cm long, mass = 0.25 kg

D. 20 cm long, mass = 0.35 kg

• Least - (A,C)

  Greatest - (B,D)

• Least - (A,D)

  Greatest (B,C)

• Least - (A,B)

  Greatest (C,D)

• Least - ( A)

  Greatest- ( B)

Tags

NGSS.HS-PS2-4

What is the period of a 1.4-m pendulum?

• 2.4 s

• 4.8 s

• 9.6 s

• 19.2 s

The springs shown in the image are identical. Contrast the potential energies of the bottom two springs

• Since they have the same spring constant, the energy of the bottom two springs is equal

• The energy of the lower spring is two times greatest than that of the second spring

• The energy of the lower spring is four times greatest than that of the second spring

• The energy of the second spring is two times greatest than that of the lower spring

Tags

NGSS.HS-PS3-2

How must the length of a pendulum be changed to double its period? How must the length be changed to halve the period?

• The length of the pendulum must be increased four times

• The length of the pendulum must be increased two times

• The length of the pendulum must be decreased four times

• The length of the pendulum must be decreased twotimes

A toy rocket launcher contains a spring with a spring constant of 35 N/m. How far must the spring be compressed to store 1.5 J of energy?

• 1.2 m

• 0.50 m

• 0.30 m

• 0.29 m

Tags

NGSS.HS-PS3-1

A spring with a spring constant of 27 N/m is stretched 16 cm. What is the spring's potential energy?

• 1.40 J

• 0.70 J

• 0.35 J

• 0.18 J

Tags

NGSS.HS-PS3-1