Energy & Momentum 2

A mass is attached on a horizontal spring and is pulled to the right of its equilibrium position. In which direction is the spring exerting force on the mass?

• To the right
• Upward
• Downward
• To the left

A mass is attached to a string is pulled below its equilibrium position. In which direction is the spring exerting a force on the mass?

• Upward
• No force exerted
• To the right

• Downward

An ideal spring has a force constant of 32 N/m. What force would the spring exert on an attached mass if the mass were pushed 17 cm past the equilibrium position?

• 7.2 N

• 6.0 N

• 5.4 N

• 4.3 N

A 2.47 kg fish is hung from a vertical spring scale with a force constant of 564 N/m. How much will the spring stretch before reaching its new equilibrium position?

• 2.5 cm

• 4.3 cm

• 5.8 cm

• 7.5 cm

A spring has a force constant of 875 N/m. How much elastic potential energy is stored in the spring if it is compressed by 3.5 cm?

• 0.13 J

• 0.54 J

• 1000 J

• 0.75 J

A spring has a force constant of 875 N/m. How much elastic potential energy is stored in the spring if it is stretched by 5.8 cm?

• 1.5 J

• 3.1 J

• 0.75 J
• 2.3 J

A Nerf gun shoots a foam dart of mass 1.80 g, using a compressed spring with a force constant of 320 N/m. If the spring is compressed by 2.80 cm, what will be the dart's speed as it leaves the gun?

• 11.8 m/s

• 3.67 m/s
• 12.45 m/s
• 5.12 m/s

In a carnival game, a 65 g rubber ball must roll up a 1.7 m long ramp with an angle of elevation of 18° to reach its target. If it's loaded into a spring contraption with a force constant of 28 N/m, how much must the spring be compressed?

• 5.0 cm

• 15 cm

• 10 cm

• 25 cm

A 305 g mass is hung from a vertical spring of force constant 89 N/m. When the spring is released from its unstretched equilibrium position, the mass is allowed to fall. What will be the distance the mass will fall before reversing direction?

• 2.5 cm

• 4.1 cm

• 6.7 cm

• 50 cm

A 54 kg student runs at a speed of 3.9 m/s at a cross-country event. What is their momentum?

• 210 kg·m/s

• 180 kg·m/s

• 300 kg·m/s

• 150 kg·m/s