Concept explainers
A rubber ball bounces. We’d like to understand how the ball bounces.
a. A rubber ball has been dropped and is bouncing off the floor. Draw a motion diagram of the ball during the brief time interval that it is in contact with the floor. Show 4 or 5 frames as the ball compresses, then another 4 or 5 frames as it expands. What is the direction of 46 m/s. during each of these parts of the motion?
b. Draw a picture of the ball in contact with the floor and identify all forces acting on the ball.
c. Draw a free-body diagram of the ball during its contact with the ground. Is there a net force acting on the ball? If so, in which direction?
d. During contact, is the force of the ground on the ball larger than, smaller than, or equal to the weight of the ball? Use your answers to parts a-c to explain your reasoning.
Want to see the full answer?
Check out a sample textbook solutionChapter 4 Solutions
College Physics: A Strategic Approach, Books a la Carte Plus MasteringPhysics with eText -- Access Card Package (3rd Edition)
Additional Science Textbook Solutions
Essential University Physics: Volume 1 (3rd Edition)
The Cosmic Perspective (8th Edition)
Sears And Zemansky's University Physics With Modern Physics
Life in the Universe (4th Edition)
College Physics: A Strategic Approach (4th Edition)
University Physics (14th Edition)
- Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such plate has an average speed of 4.0 cm/year. (a) What distance does it move in 1 s at this speed? (b) What is its speed in kilometers per million years?arrow_forwardA fastball pitcher can throw a baseball at a speed of 40 m/s (90 mi/b). (a) Assuming the pitcher can release the ball 16.7 m from home plate so the ball is moving horizontally, how long does it take the ball to reach bone plate? (b) How far does the ball drop between the pitcher’s hand and home plate?arrow_forwardTwo boats start together and race across a 60-km-wide lake and back. Boat A goes across at 60 km/h and returns at 60 km/h. Boat B goes across at 30 km/h, and its crew, realizing how far behind it is getting, returns at 90 km/h. Turnaround times are negligible, and the boat that completes the round trip first wins. (a) Which boat wins and by how much? (Or is it a tie?) (b) What is the average velocity of the winning boat?arrow_forward
- After a long and grueling race, two cadets, A and B, are coming into the finish line at the Marine Corps marathon. They move in the same direction along a straight path; the position-versus-time graphs for the runners are shown in Figure P2.7 for a minute near the end of the race. a. At time t1 is the speed of cadet B greater than, less than, or equal to the speed of cadet A? b. At time t2, is cadet B speeding up, slowing down, or moving with constant speed? c. From time t = 0 to time t = 60 s, is the average speed of cadet B greater than, less than, or equal to the average speed of cadet A? Explain.arrow_forwardPete and Sue, two reckless teenage drivers, are racing eastward along a straight stretch of highway. Pete is traveling at 98.0 km/h, and Sue is chasing him at 125 km/h. a. What is Petes velocity with respect to Sue? b. What is Sues velocity with respect to Pete? c. If Sue is initially 325 m behind Pete, how long will it take her to catch up to him?arrow_forward1. a 100kg astronaut (including the space suit) becomes untethered during a space walk and drifts to a distance of 10m from the mother ship. To get back to the ship, he throws his 2.5kg tool kit away with an acceleration of 8.0ms-1 that acts over 0.50s. a) How does throwing the tool kit away help the astronaut in the situation? b) How large is the fact that acts on the tool kit and the astronaut? c) With that speed will the astronaut drift to the mother ship? d) How long will it take for the astronaut to reach the ship?arrow_forward
- B) After the block comes to rest, the spring pushes the block back up the ramp. How fast, in meters per second, is the block moving right after it comes off the spring ?arrow_forwardA 1500kg sport car is moving westbound at 20m/s on a level road when it collided with a 4000kg truck driving east on the same road at 15m/s. The two vehicles remain locked together after the collision. a)what are is the magnitude of the velocity of the two vehicles just after the collision?arrow_forwardAn object is dropped from the top of a building and hits the ground after 2.75 seconds. a) What will be the final velocity of the object? b) How tall is the building?arrow_forward
- A 0.623 kg. basketball is dropped from the rooftop of a building. If it took the ball 3.5 seconds to reach the ground,a. What is the speed of the ball before it touches the ground? b. How high is building?arrow_forwardAfter a big snowfall, you take your favorite rocket‑powered sled out to a wide field. The field is 209 m across, and you know that your sled accelerates at a rate of 3.25 m/s^2 when the rocket is on. a) How much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time in seconds? b) How fast will the sled be moving when it reaches the other end of the field in m/s? c) How fast will the sled be moving when it is halfway across the field in m/sarrow_forwardA car goes 78 m to the righty and then 22 m to the left. It makes this trip on 35 seconds. a. What is the displacement in meters? b. What is the total distance travelled in meters? c. What is the average velocity? d. What is the average speed in m/s?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
- University Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice UniversityCollege PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College