1)A person jumps from a wall and lands stiff-legged. Which statement best explains why the person is less likely to be injured when landing on soft sand than on concrete? Select all that apply. a. The upward acceleration of the person in the sand is less than on concrete, thus the force that the sand exerts on the person is less. b. The person sinks into the sand, increasing the stopping distance. c. The concrete can exert a greater force than the sand. 2)You are inside a car that is speeding up, and you notice a book on the seat next to you starting to slide back. What is happening? a. Not enough information is given to answer the question. b. The sum of the forces on the book is 0, but is looks like it still accelerating because Newton's 2nd Law doesn't apply in this situation. c. The seat is exerting a horizontal force on the book pointing backwards.. 3)A person pushes a 8 kg crate, exerting a 64 N force on it, but the crate’s acceleration is only 5 m/s2. Explain. a. There are other forces exerted on the crate so that the total force is reduced. b. Not enough information is given to answer the question. c. The crate pushes back on the person, thus the total force is reduced. d. Newton's 2nd Law doesn't apply in this situation. 4) A 1000-kg car is driving toward the north along a straight horizontal road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest uniformly in a distance of 200 m. What are the magnitude and direction of the net force applied to the car to bring it to rest? a. 1.00 × 103 N north b. 1.00 × 103 N south c. 1.40 × 103 N south d. 1.20 N south c. 0.800 N south 5) A person pushes a 10 kg crate, exerting a 200 N force on it, but the crate’s acceleration is only 5 m/s2. Explain. a. Not enough information is given to answer the question. b. There are other forces exerted on the crate so that the total force is reduced. c. The crate pushes back on the person, thus the total force is reduced.
1)A person jumps from a wall and lands stiff-legged. Which statement best explains why the person is less likely to be injured when landing on soft sand than on concrete? Select all that apply.
a. The upward acceleration of the person in the sand is less than on concrete, thus the force that the sand exerts on the person is less.
b. The person sinks into the sand, increasing the stopping distance.
c. The concrete can exert a greater force than the sand.
2)You are inside a car that is speeding up, and you notice a book on the seat next to you starting to slide back. What is happening?
a. Not enough information is given to answer the question.
b. The sum of the forces on the book is 0, but is looks like it still accelerating because Newton's 2nd Law doesn't apply in this situation.
c. The seat is exerting a horizontal force on the book pointing backwards..
3)A person pushes a 8 kg crate, exerting a 64 N force on it, but the crate’s acceleration is only 5 m/s2. Explain.
a. There are other forces exerted on the crate so that the total force is reduced.
b. Not enough information is given to answer the question.
c. The crate pushes back on the person, thus the total force is reduced.
d. Newton's 2nd Law doesn't apply in this situation.
4) A 1000-kg car is driving toward the north along a straight horizontal road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest uniformly in a distance of 200 m. What are the magnitude and direction of the net force applied to the car to bring it to rest?
a. 1.00 × 103 N north
b. 1.00 × 103 N south
c. 1.40 × 103 N south
d. 1.20 N south
c. 0.800 N south
a. Not enough information is given to answer the question.
b. There are other forces exerted on the crate so that the total force is reduced.
c. The crate pushes back on the person, thus the total force is reduced.
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