A student stands on a skateboard on smooth pavement. Her friend pulls her with a rope so the net horizontal force on the student and skateboard is 30 N.

A constant horizontal force is applied to four different carts on a nearly frictionless surface. The table shows the measured acceleration for each cart.

Two students pull a cart in opposite directions. One pulls 22 N to the right; the other pulls with 14 N to the left.

Students test an electric scooter on a straight bike path. In each trial, the rider starts from rest and holds the throttle fully open until the scooter reaches 5.0 m/s.

A small cart moves along a straight, metal track. The cart is pulled to the left by a horizontal force from a pulley system.

Students analyze data from a small “rocket sled” on a straight, horizontal track. A compressed-air rocket pushes the sled forward during the first part of the motion.