Objective 1, Unit 5 Pre-assessment: Introduction to Energy Transfers (Work, Power, GPE, & KE)

Master energy transfers! Solve problems on work, power, GPE, and KE.

1) A 750N mountain climber scales a 150m cliff. How much work is done by the mountain climber? 0 J 0.2 J 5 J 112,500 J 2) A 900N weightlifter attempts to lift 2,200N in a weightlifting competition. The weight does not leave the floor. How much work did the weightlifter do to the weight? 0 J 2.4 J 1,300 J 3,100 J 3) An Instacart shopper uses a force to lift a 2.5 kg grocery bag while doing 50 Joules of work. How far did they lift the grocery bags? 0 m 0.5 m 2 m 20 m 4) A water balloon launcher launches a 5 kg water balloon across an open field. The water balloon travels 80 meters in 4 seconds from it's initial position at rest. How much work was done by the water balloon launcher? 25 J 100 J 400 J 2000 J 5) A student does 20 Joules of work to push the pencil 2 meters in 0.5 s. How much power did they use? 10 W 20 W 40 W 80 W 6) How much power is required to pull a sled 5 meters in 2 seconds if you use 60N of force? 9 W 24 W 150 W 600 W 7) A golf ball with a mass of 45 g and ping pong ball with a miss of 4.5 g are both sitting on the flat ground. Which object has the most gravitational potential energy? they have equal GPE the golf ball has more GPE the ping pong ball has more GPE 8) Imagine that a ball has a mass of 30 g and a second ball has a mass of 10 g. Which shelves should you place the two objects in order for them to have the same GPE? SELECT ALL THAT APPLY 10 g ball - 0.5 meter shelf 10 g ball - 1 meter shelf 10 g ball - 2 meter shelf 10 g ball - 3 meter shelf 30 g ball - 0.5 meter shelf 30 g ball - 1 meter shelf 30 g ball - 2 meter shelf 30 g ball - 3 meter shelf 9) Prior to a 5 kg ball falling, it has 588 J of energy. What is the height of the ball before it is let go? 0.08 m 12 m 118 m 300 m 10) A 2 kg object is moving at a constant velocity of 20 m What is the kinetic energy of the object? 10 J 40 J 400 J 800 J 11) An object has 100 J of energy when it is moving at a rate 10 m What is the mass of the object? 2 kg 5 kg 10 kg 25 kg 12) What is the velocity of a 5 kg object with a kinetic energy of 400 J? 6.25 m 12.6 m 40 m 160 m