A roller coaster begins at the top of a hill. If it accelerates at the rate of $$2 \, \text{m/s}^2$$ and has a mass of $$2000 \, \text{kg}$$ , what net force is acting on it? (Use $$F=ma$$ )

If Shane and Susan both push on a box with a force of $$25 \, \text{N}$$ , but in opposite directions, what will happen to the box?

You are holding a full bowl of hot soup while standing in the kitchen. As you begin moving, some of the soup spills out of the bowl onto the floor. Upon reflection, you realize that:

The graph shows the acceleration of a racehorse taking off from a starting gate. By how much did the horse's speed increase between 4 seconds and 6 seconds?

Gravity is a force between any two objects with mass. Why doesn't a person feel a gravitational force between him/herself and another person?

Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?

A man has an air conditioner he wants to load into the back of his truck. Instead of lifting the air conditioner and carrying it to the truck, he improvises a ramp. He takes a board that is 3.6 meters long and places one end of it in the back of his truck, 1.2 meters off the ground. What is the mechanical advantage of the ramp?

Which statement is TRUE about the picture above?

This graph describes the motion of a skydiver that jumped from an airplane. The skydiver is MOST LIKELY:

Based on the graph, how would you describe the net forces acting on the moving object?

Consider this line graph that represents speed in meters/second. The X-axis is labeled in seconds; the Y-axis is labeled in meters. Suppose that a moving object is moving at a constant speed of 4 m/s. Evaluate how the graph for constant speed 4 m/s would look compared to the line graph seen here.

This diagram shows the movement of a skater at 1-second intervals. What is the magnitude of the average velocity, in m/s, if the skater went for a total of 12 meters?

Four students tried out for a softball team. Each student threw the ball from the pitcher’s mound to home plate. The coach recorded how many seconds it took each throw to reach home plate. Which student threw the ball with the greatest force?

Supplies are dropped from an airplane onto a remote island. A parachute is used to reduce the impact when the supplies strike the ground. Which of these is most likely to improve the design of a parachute?