A student draws the flawed free-body diagram shown as we discussed earlier to represent the forces acting on a car traveling at constant speed on a level road. Identify the errors in the diagram, then draw a correct free-body diagram for this situation.

An ascending elevator, hanging from a cable, is coming to a stop. Which forces are acting on the elevator? In which direction are those forces?

two children fight over a 200 g stuffed bear. The 25 kg boy left with a 17 N force. Ignore all other forces on the bear (such as its weight). a. At this instant, can you say what the velocity of the bear is? If so, what are the magnitude and direction of the velocity? b. At this instant, can you say what the acceleration of the bear is? if so what are the magnitude and direction of the acceleration?

The light turns green and you accelerate rapidly forward so that you and your passenger feel "thrown back" into your seat. Consider your passenger to be the object.

For the problem. Draw a motion diagram, a force identification diagram, and a free body diagram. An elevator, suspended by a single cable, has just left the tenth floor and is speeding up as it descends toward the ground floor.

Three ice skaters, numbered 1,2, and 3, stand in a line, each with her hands on the shoulders of the skater in front. Skater 3, at the rear, pushes on skater 2. Identify all the action/reaction pairs of forces between the three skaters. Draw a free-body diagram for skater 2, in the middle. Assume the ice is frictionless.

A $55 \mathrm{~kg}$ ice skater is gliding along at $3.5 \mathrm{~m} / \mathrm{s}$. Five seconds later her speed has dropped to $2.9 \mathrm{~m} / \mathrm{s}$. What is the magnitude of the kinetic friction acting on her skates?

A car is skidding to a stop on a level stretch of road. Identify all the action/reaction pairs of forces between the car and the road surface. Then draw a free-body diagram for the car.

You're exploring a cave. Standing in a low cavern, you steady yourself by pushing straight up on the rock ceiling. Identify the forces acting on you.

A person leans against a wall. Draw a free-body diagram for the person.

Draw a free-body diagram of a water bucket being lifted by a rope at a decreasing speed. Specifically identify the system. Label all forces with their agents and make the arrows the correct lengths.

Draw the free-body diagram of a baseball at the moment it is hit by the bat.

(a) Draw the free-body diagram of the beam. (b) Determine the tension in the cable and the reactions at $AA$.

Calculate the reactions at points $A$ and $B$ for the beams shown. Draw the complete load diagram (free-body diagram) in each case.