|MS-PS2-2.||Plan an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object. [Clarification Statement: Emphasis is on balanced (Newton’s First Law) and unbalanced forces in a system, qualitative comparisons of forces, mass and changes in motion (Newton’s Second Law), frame of reference, and specification of units.] [Assessment Boundary: Assessment is limited to forces and changes in motion in one-dimension in an inertial reference frame and to change in one variable at a time. Assessment does not include the use of trigonometry.]|
Warm-up Questions - Answer in the Quickwrite
- What is a lever?
- What is torque?
- What are examples in the body of first, second, and third class levers?
- Balance the meter stick at the 0.50m (50 cm) mark.
- Measure the mass of two hanger/block combinations, and determine the force (weight) of each in newtons by multiplying by the acceleration due to gravity (F=mg)
- Place one on the right side of the fulcrum, and the other on the left side so that the meter stick balances as shown in the diagram
- Put your values in the table below.
Use the quickwrite to answer the following questions:
- Examine the graph that displays class data of the relationship between clockwise and counter-clockwise torque in a balanced system. Describe the relationship between clockwise torque and counter-clockwise torque in a balanced system. Write an equation that describes this relationship.
- Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. What is the formula for mechanical advantage?
- What is sacrificed when the mechanical advantage is greater than 1? What is gained?
- Explain the following diagram