Horizontal Springs

A sprinter accelerates from rest. Is the work done on the sprinter positive, negative, or zero?

• Positive

• Negative

• Zero

Tags

NGSS.HS-PS2-1

A spring has an unstretched length of 10 cm. It exerts a restoring force F when stretched to a length of 11 cm. For what length of the spring is its restoring force 3F?

• 3 cm

• 13 cm

• 33 cm

• 3.67 cm

The left end of a spring is attached to a wall. When Bob pulls on the right end with a 200 N force, he stretches the spring by 20 cm. The same spring is then used for a tug-of-war between Bob and Carlos. Each pulls on his end of the spring with a 200 N force. How far does the spring stretch?

• 5 cm

• 0 cm

• 10 cm

• 20 cm

Tags

NGSS.HS-PS2-1

A horizontal spring with spring constant 85 N/m extends outward from a wall just above floor level. A 1.5 kg box sliding across a frictionless floor hits the end of the spring and compresses it 6.5 cm before the spring expands and shoots the box back out. How fast was the box going when it hit the spring?

• 2.3 m/s

• 0 m/s

• 0.49 m/s

• .2401 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

A horizontal spring with spring constant 250 N/m is compressed by 12 cm and then used to launch a 250 g box across the floor. The coefficient of kinetic friction between the box and the floor is 0.23. What is the box's launch speed?

• 3.7 m/s

• 1.73 m/s

• 5.12 m/s

• 2.2 m/s

Tags

NGSS.HS-PS2-1