7th Grade Science Guide

7.1: Forces & Motion 3 Dimensions & Progressions

Unit 1

● Understand the effects of air resistance on falling objects. ● Determine the effect of an object’s mass and radius on its terminal velocity. ● Interpret graphs of position, velocity, and acceleration. ● Calculate the fnal velocity and drop time for an object falling from a given height. ● Determine that a force is needed to cause a change in motion. ● Understand that friction is a force resisting motion. ● See that a moving object will continue at constant speed if no forces are acting upon it. ● Determine that larger

compared, and their motion can be observed in a vacuum, in normal air, and in denser air. The position, velocity, and acceleration are measured over time, and the forces on the object can be displayed. Using the manual settings, the mass, radius, height, and initial velocity of the object can be adjusted, as can the air density andwind.

Activity: Gizmos - Force & Fan Carts

Objective

Overview

Materials

● Explore the laws of motion using a simple fan cart. Use

● Gizmo

the buttons to select the speed of the fan and the surface, and press Play to begin. You can drag up to three objects onto the fan cart. The speed of the cart is displayed with a speedometer and recorded in a table and a graph.

forces cause greater changes in motion.

● Understand the

relationship between speed, position, and time. ● Observe that a constant

force gives rise to a constant change in speed.

Activity: Newtonian Bowling

Objective

Overview

Materials