Review Deathmatch

Work with your partner to see how many questions you can get correct

out of 20. (Miss 1 or less and you can choose to have this replace an assignment that is already in the

grade book)

Question 1In Physics, a force is described as being either a _______ or a _______.

Question 2When you are asked to find the weight of an object, what equation should you use?

Question 3A car runs out of gas and is being pushed. If you double the force by finding a friend to help you push as well, what will happen to the car’s acceleration?a)It doublesb)It quadruplesc)It halvesd)It quarters

Question 4Two ballerinas from The Nutcracker having the same mass run towards each other, each moving at the same speed. What is the total momentum of the two ballerinas after they collide? Or do you need more info?

Question 5If a 500 kg train car is going 5 m/s, and it picks up a load that doubles it’s overall mass, its momentum willa)Doubleb)Triplec)Quadrupled)Remain the same.

Question 6To reduce the force of impact in a car crash, airbags _______ the stopping time.a) increaseb) decrease

Question 7What is the momentum of a 5 kg apple that is thrown with a velocity of 10 m/s?

Question 8What is the mass of an object that is going 10 m/s and has a momentum of 40 kg-m/s?

Question 9A 5 kg object traveling at 4 m/s collides with another object that is traveling 10 m/s. Both objects come to a complete stop after they hit each other. What is the mass of the 2nd object?

Question 10What is the mass of a 20 N rock on earth? (Assume gravity is 10 m/s2)

Question 11A 2 kg object going 10 m/s hits another 2 kg object that is at rest. The objects are locked together after they hit. What is the velocity of the 2 objects after they collide?

Question 12How much work is done on a 10.0 N snowball that you lift 5.0 m straight up?

Question 13How much power is expended if you lift that 10.0 N snowball 5 meters in 5.0 seconds?

Question 14In order for an object to have kinetic energy, it must be _______.

Question 15A sled full of presents and an empty sled slide down a hill. If there was no friction, at the bottom of the hill, the sled full of presents would have a greater _______a)Speedb)Accelerationc)Momentumd)All of the abovee)None of the above

Question 16A 5 kg rock starts from rest and falls from a height of 12 meters. How much potential energy did the rock have before the fall?

Question 17A 10 kg object is shot out of a cannon with a velocity of 40 m/s from ground level. What is the initial kinetic energy of the object?

Question 18What is the power a lifter has to exert in order to lift a 60 kg mass 2.0 meters in .5 seconds?

(hint: it’s not a one step problem…but it’s not a 7 step problem either)

Question 19What is the weight of a 7 kg snowman on earth? (not in pounds)

Question 20In order for an object to have gravitational potential energy, it must ……. ?

Answers1) Push or pull2) F=ma3) A: doubles4) 0 kg-m/s5) A: doubles6) A: increase7) 50 kg-m/s8) 4 kg9) 2 kg10)2 kg

11) 5 m/s12) 50 J13) 10 watts14) Moving15) c: momentum16) 600 J17) 8000 J18) 2400 J19) 70 Newtons20) Be above the ground