1) 200 km/hr 2) 100 km/hr 3) 90 km/hr 4) 70 km/hr 5) 50 km/hr From rest, we step on the gas of our Ferrari, providing a force F for 40 m, speeding it up.

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1) 200 km/hr 2) 100 km/hr 3) 90 km/hr 4) 70 km/hr 5) 50 km/hr From rest, we step on the gas of our Ferrari, providing a force F for 40 m, speeding it up to a final speed 50 km/hr. If the same force would be applied for 80 m, what final speed would the car reach? 11. ConcepTest 4.4dOff to the Races IV 11. ConcepTest 4.4d Off to the Races IV v F

F a1a1 m1m1 F m2m2 m1m1 a3a3 1) 3/4 a 1 2) 3/2 a 1 3) 1/2 a 1 4) 4/3 a 1 5) 2/3 a 1 A force F acts on mass m 1 giving acceleration a 1. The same force acts on a different mass m 2 giving acceleration a 2 = 2a 1. If m 1 and m 2 are glued together and the same force F acts on this combination, what is the resulting acceleration? F a 2 = 2a 1 m2m2 12. ConcepTest 4.6Force and Two Masses 12. ConcepTest 4.6 Force and Two Masses

13. ConcepTest 4.7aGravity and Weight I 13. ConcepTest 4.7a Gravity and Weight I 1) F g is greater on the feather 2) F g is greater on the stone 3) F g is zero on both due to vacuum 4) F g is equal on both always 5) F g is zero on both always What can you say about the force of gravity F g acting on a stone and a feather?

14. ConcepTest 4.9aGoing Up I 14. ConcepTest 4.9a Going Up I A block of mass m rests on the floor of an elevator that is moving upward at constant speed. What is the relationship between the force due to gravity and the normal force on the block? 1) F N > mg 2) F N = mg 3) F N < mg (but not zero) 4) F N = 0 5) depends on the size of the elevator m v

A block of mass m rests on the floor of an elevator that is accelerating upward. What is the relationship between the force due to gravity and the normal force on the block? 1) F N > mg 2) F N = mg 3) F N < mg (but not zero) 4) F N = 0 5) depends on the size of the elevator 15. ConcepTest 4.9bGoing Up II 15. ConcepTest 4.9b Going Up II m a

16. ConcepTest 4.10Normal Force 16. ConcepTest 4.10 Normal Force Case 1 Case 2 Below you see two cases: a physics student pulling or pushing a sled with a force F which is applied at an angle . In which case is the normal force greater? 1) case 1 2) case 2 3) it’s the same for both 4) depends on the magnitude of the force F 5) depends on the ice surface

17. ConcepTest 4.12Climbing the Rope 17. ConcepTest 4.12 Climbing the Rope When you climb up a rope, the first thing you do is pull down on the rope. How do you manage to go up the rope by doing that?? 1) this slows your initial velocity which is already upward 2) you don’t go up, you’re too heavy 3) you’re not really pulling down – it just seems that way 4) the rope actually pulls you up 5) you are pulling the ceiling down

18. ConcepTest 4.14aCollision Course I 18. ConcepTest 4.14a Collision Course I A small car collides with a large truck. Which experiences the greater impact force? 1) the car 2) the truck 3) both the same 4) it depends on the velocity of each 5) it depends on the mass of each

1) the car 2) the truck 3) both the same 4) it depends on the velocity of each 5) it depends on the mass of each In the collision between the car and the truck, which has the greater acceleration? 19.ConcepTest 4.14bCollision Course II 19.ConcepTest 4.14b Collision Course II

20. ConcepTest 4.15aContact Force I 20. ConcepTest 4.15a Contact Force I If you push with force F on either the heavy box (m 1 ) or the light box (m 2 ), in which of the two cases below is the contact force between the two boxes larger? 1) case A 2) case B 3) same in both cases F m2m2m2m2 m1m1m1m1A F m2m2m2m2 m1m1m1m1B

21. ConcepTest 8.4Using a Wrench You are using a wrench to loosen a rusty nut. Which arrangement will be the most effective in loosening the nut? ) all are equally effective

22. ConcepTest 9.1Balancing Rod 1kg 1m A 1 kg ball is hung at the end of a rod 1 m long. If the system balances at a point on the rod 0.25 m from the end holding the mass, what is the mass of the rod? 1) 1/4 kg 2) 1/2 kg 3) 1 kg 4) 2 kg 5) 4 kg

23. ConcepTest 9.2Mobile 1 kg 1 m3 m 1 m2 m ? ? A (static) mobile hangs as shown below. The rods are massless and have lengths as indicated. The mass of the ball at the bottom right is 1 kg. What is the total mass of the mobile? 1) 5 kg 2) 6 kg 3) 7 kg 4) 8 kg 5) 9 kg