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chapter 5 REVIEW

front 1 You are to place a 25.0 kg load on a truck. You can either use a ramp, or you can lift it up vertically and put it on the truck. Compare the work done in the two cases. Ignore friction in the ramp. a. Work is more in carrying it up the ramp as the distance is increased. b. Work is more in lifting it vertically as more force is needed. c. Work is the same in both cases.	back 1 c. Work is the same in both cases.
front 2 How much work is done by you when you walk up the stairs from the ground level to the third level, and then walk back down to the ground level? a. Some positive number, depending on your mass and height of the third level. b. Some negative number, depending on your mass and height of the third level. c. Zero.	back 2 c. Zero.
front 3 The direction of kinetic energy has a- same direction as the object's speed. b- same direction as the object's weight. c- direction opposite to the object's velocity. d- no direction attached with it.	back 3 d- no direction attached with it.
front 4 Which of the following answers is correct regarding conservative forces? a. Friction and gravity are conservative forces. b. Electromagnetic forces and friction are conservative forces. c. Gravity and momentum are conservative forces. d. Electromagnetic force and gravity are conservative forces	back 4 d. Electromagnetic force and gravity are conservative forces

front 5 Persons A and B both carry a mass of 3.00 kg from the first floor up to the third floor. Person A reaches the third floor in 100 seconds, while person B reaches in 150 seconds. Which of the following is true? a. A does more work and uses more power than B. b. A does less work and uses less power than B. c. A does same work and uses same power as B. d. A does same work and uses more power than B. e. A does more work and uses less power than B.	back 5 d. A does the same work and uses more power than B.
front 6 A crate with mass 32.5 kg initially at rest on a warehouse floor is acted on by a net horizontal force of 140 N. What acceleration is produced? 4.31 m/s/s 4550 m/s/s 32.5 m/s/s 0.232 m/s/s	back 6 4.31 m/s/s
front 7 A crate with mass 25.0 kg initially at rest on a warehouse floor is acted on by a horizontal force of 100 N. The friction force between the crate and the floor is 40.0 N. What acceleration is produced? (give your answer in m/s²) Group of answer choices 5.60 2.40 1.60 4.00	back 7 2.40
front 8 What is the purpose of the motion sensor in this experiment (mark best answer) Group of answer choices To see if the cart is in motion To measure the mass of the cart To measure the tension in the string To measure the acceleration of the cart	back 8 To measure the acceleration of the cart

front 9 If we put extra wights on the cart, how would that affect the cart's acceleration (for the same hanging mass) Group of answer choices The acceleration would be larger There would be no affect of the acceleration The acceleration would be smaller	back 9 The acceleration would be smaller
front 10 How would increased friction in the wheels of the cart affect the acceleration (for the same hanging mass) Group of answer choices It would increase the acceleration There would be no affect on the acceleration It would decrease the acceleration	back 10 It would decrease the acceleration
front 11 When would you expect the tension in the string to be maximum, for the same hanging mass? Group of answer choices When there is some mass in the cart, so that its acceleration is small When you hold the cart so that it does not move when the cart is very light so that its acceleration is large	back 11 When you hold the cart so that it does not move
front 12 An amount of work equal to 6.0 J is required to compress the spring in a spring-gun. What is the potential energy of the compressed spring? a. 6.0 J b. 3.0 J c. 1.0 J d. 1/6 J	back 12 a. 6.0 J

front 13 An amount of work equal to 10 J is required to compress a spring. What is the potential energy of the spring? a. 10 J b. 5 J c. 20 J d. 0 J	back 13 a. 10 J
front 14 A spring stores 8.0 J of potential energy after being compressed. How much work was done on the spring? a. 8.0 J b. 4.0 J c. 16.0 J d. 0 J	back 14 a. 8.0 J
front 15 A force does 12 J of work compressing a spring. What is the elastic potential energy? a. 6 J b. 12 J c. 24 J d. 1/12 J	back 15 b. 12 J
front 16 A spring gun is compressed, storing 15 J of energy. How much work was required to compress it? a. 15 J b. 7.5 J c. 30 J d. 0 J	back 16 a. 15 J

front 17 Work is done on a spring and equals 9 J. What is the spring’s potential energy? a. 9 J b. 18 J c. 4.5 J d. 0 J	back 17 a. 9 J
front 18 You throw a ball of mass 5 kg straight up with velocity 10 m/s, what will be its Potential Energy when it reaches its highest position? a- 50 J b- 250 J c- 500 J d- 100 J	back 18 a. 50 J
front 19 A ball of mass 2 kg is thrown straight up at 10 m/s. What is its potential energy at the highest point? a. 20 J b. 50 J c. 100 J d. 200 J	back 19 100
front 20 A 4 kg object is thrown upward with velocity 5 m/s. What is the potential energy at the top? a. 25 J b. 50 J c. 100 J d. 10 J	back 20 50

front 21 A 1 kg ball is thrown straight up at 20 m/s. What is its potential energy at the highest point? a. 100 J b. 200 J c. 400 J d. 20 J	back 21 200
front 22 A 3 kg object is thrown upward at 8 m/s. What is the potential energy at the highest point? a. 96 J b. 192 J c. 48 J d. 24 J	back 22 96
front 23 An object is thrown upward and has initial kinetic energy of 150 J. What is its potential energy at the highest point? a. 75 J b. 150 J c. 300 J d. 0 J	back 23 150