Pam ran down the sidewalk to school with her empty backpack. After school, Pam’s backpack was loaded with books. Which best describes the force required to carry her book bag home?

Sam is building a car to race down a ramp. The car weighs 100 grams. Which could Sam do to increase the speed of the car?

How does friction affect speed?

Tamara and Justin are racing on the playground. Tamara runs the distance from the basketball goal to the jungle gym in 45 seconds, while Justin runs the same distance in 52 seconds. Which best describes the movement of the students?

A girl walked for 30 minutes. She noticed that she traveled farther in the first 15 minutes of her walk than in the second 15 minutes. What can she conclude about her walk?

James and Roy compare the motion of two balls by rolling them across the floor and recording the time it takes them to travel the same distance. Ball X travels the distance in 15 seconds. Ball Y travels the distance in 11 seconds. Which best compares the motion of the two balls?

Which best describes the force of gravity?

When is friction needed during the course of motion?

Four different students take turns pushing a large, heavy ball on the school parking lot. What is the best way to determine which student used the most force to push the ball?