# PHYSICS REVIEW 2: Question Preview (ID: 1963)

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**Conservation of Energy means that:**

a) only small amounts of energy can be lost.

b) energy cannot be created nor destroyed only changed in form.

c) kinetic energy can be lost, but potential cannot.

d) potential energy can be lost, but kinetic cannot.

**It takes Grandpa Simpsons fake teeth 1.5 seconds to fall to the ground (a distance of 1.5 meters) from his mouth. What is the average speed with which the teeth fall?**

a) 2.25 m/s

b) 1.0 m/s

c) 1.0 s/m

d) 2.25 m x s

**LeBron steals the basketball from Kobe and dunks it after 3.5 seconds. How far away from the basket was he when he stole the ball if he ran with an average speed of 4 m/s to get there?**

a) 14 meters

b) 0.875 meters

c) 1.14 meters

d) 14 meters per second

**A 120-lb skateboarder with the speed of 10 mph collides with a shopping cart (This is why you should not skateboard in the mall!). What is the skateboarders momentum?**

a) 1200 mph

b) 12 lb/mph

c) 0.083 mph/lb

d) 1200 lb*mph

**Danica Patrick takes 2.5 s to speed up from 200 km/hr to 210 km/hr to pass the racer in front of her. What is her cars acceleration?**

a) 4 km/hr/s

b) - 4 km/hr/s

c) 25 km/hr/s

d) 84 km/hr/s

**If a car decelerates from 100 km/hr to 0 km/hr in 8 seconds, its acceleration is:**

a) 12.5 km/hr/s

b) 12.5 km/hr/hr

c) - 12.5 km/hr/hr

d) - 12.5 km/hr/s

**The kinetic energy of a 10 kg bowling ball rolling with velocity of 15 m/s N is:**

a) 1125 J

b) 2250 J

c) 150 J

d) 1.5 J

**A 50 kg Wonder-woman is set to jump from a skyscraper that is 250 m high. What is her total gravitational potential energy (remember that g = 9.8 m/s/s)?**

a) 490 J

b) 1275.5 J

c) 122500 J

d) 12500 J

**A force gives a 2.0 kg mass an acceleration of 6.0 m/s/s. What is the magnitude of the force?**

a) 3.0 N

b) 12 m/s/s

c) 12 N

d) 0.33 N

**If a car at rest requires a force of 100 N to be put in motion, and the force of friction is 5 N, what is the net force required to move it?**

a) 100 N

b) 95 N

c) 105 N

d) It cannot be moved.

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