Types of Forces

A spring extends 1.5m under load 10N. What is its spring constant?

• 0.15N/m
• 10N/m
• 6.7N/m
• 15N/m

A net force of 430 N acts to stretch an extension spring.  How far will the spring stretch if its spring constant is 700 N/m?

• 43.9
• 0.307 m
• 1.63 m
• 0.614 m

An unstretched spring has a length of 0.10 meters. When the spring is stretched by a force of 16 newtons, its length is increased to 0.18 meters. What is the spring constant of this spring? 

• 0.89 N/cm 
• 2.0 N/cm 
• 1.6 N/cm 
• 1.8 N/cm

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

F_N=100N, F_f=20N

• μ=5.0

• μ=0.2

• μ=1.2

• μ=0.1

What direction does friction act relative to motion?

• in the same direction
• in the opposite direction 
• need more information
• depends on the force

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N? 

• 0.78
• 0.51
• 0.78 N
• 0.58 N

Tags

NGSS.HS-PS2-1

A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box? 

• 81 N
• 18 N
• 98 N
• 74 N

Tags

NGSS.HS-PS2-1

A man standing on a scale in an elevator notices that the scale reads 40 newtons greater than his normal weight.

Which type of movement of the elevator could cause this greater-than-normal reading?

• accelerating upward

• accelerating downward

• moving upward at a constant speed

• moving downward at a constant speed

Tags

NGSS.HS-PS2-1

A woman standing on a scale in an elevator notices that the scale reads 100 newtons less than her normal weight. Which type of movement of the elevator could cause this greater-than-normal reading?

• accelerating upward

• accelerating downward

• moving upward at a constant speed

• moving downward at a constant speed

Tags

NGSS.HS-PS2-1