Physics Questions & Answers

Physics Questions & Answers A 0.150 kg baseball is thrown upward with an initial speed of 20 m/s. a. What is the force on the ball when it reaches half of its maximum height? b. What is the force on the ball when it reaches its peak? - CORRECT ANSWER- a. -1.47 N b. -1.47 N A beach ball is left in the bed of a pick up truck. Describe what happens to the ball when the truck accelerates forward. - CORRECT ANSWER- The ball moves toward the back of the truck because inertia keeps it in place relative to the ground. A chair is pushed forward with a force of 185 N. The gravitational force of Earth on the chair is 155 N downward, and the floor exerts a force of 155 N upward on the chair. Draw a free body diagram showing the forces acting on the chair. - CORRECT ANSWER- Fapplied (185 N) points forward, Fg (155 N) points downward, and Fn (155 N) points upward A dog pulls on a pillow with a force of 5 N at an angle of 37 degrees above the horizontal. Find the x and y components of this force. - CORRECT ANSWER- 4 N; 3 N A large crate is placed on the bed of a truck but is not tied down. a. As the truck accelerates forward, the crate slides across the bed until it hits the tailgate. Explain what causes this. b. If the driver slammed on the brakes, what would happen to the crate? - CORRECT ANSWER- a. The inertia of the crate b. It could continue forward by inertia and hit the cab