Momentum, Energy, Power, & Work Whiteboard Review

Momentum, Energy, Power, & Work Whiteboard Review

Impulse: (p) Momentum v m Momentum: kg-m/s kg m/s Law of conservation of momentum Potential Energy

Kinetic Energy Law of conservation of energy Unit: Joule (J) Work Power Unit: Joule (J) Unit: Watt (W)

Match those Units! • Momentum a. Joule • Force b. N·m • Energy c. kg·m/s • Work d. Watt • Power e. Newton

Answers to “Match those Units!” 1. Momentum----------c. kg·m/s 2. Force-----------------e. Newton 3. Energy---------------a. Joule 4. Work------------------b. N·m or a. Joule 5. Power----------------d. Watt or J/s

Two identical twins ascend a flight of stairs. Student A walks, student B runs. Who does more WORK getting to the top of the stairs?

Question #1 • An object that has kinetic energy must be…. • At rest • In Motion • Falling • At an elevated position

Question #2 • If you use 200 J of work in 25 s, how much power have you exerted?

Question #3 • A woman lifts a 1500 N box 3 meters off the ground • How much work was done?

Question #4 • If you push for an hour against a stationary wall, no work is done • On the wall • On you • Both of these • None of these

Question #5 • Both children have the same mass. • Which child has more potential energy?

Question #6 • Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, at the moment just before they reach the ground • A has more Momentum than B • B has more Momentum than A • B has more PE than A • Not enough information

Question #7 • How much work is done on a 15 kg dog to move it 5 m? Include units.

Question #8 • A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of…….. • Work • Power • mass • Potential Energy

Question #9 • A 50-caliber bullet has a weight of 0.045 kg and a KE of 5600 J. • What is the velocity of the bullet?

Questions #10 • A 181 kg motorcycle is traveling at 76 m/s. How much kinetic energy does it have?

Question #12 • A student climbs up 4 meters of stairs and does 150 J of work. • How much force was required? Include units.

Question #13 • If you push for one hour on a stationary wall with 50 N of force, how much WORK do you do?

Question #14 • An 80 kg person running at 6 m/s has how much momentum? Include units.

Question #15 • If you push an object twice as far while applying the same force, do you do • Four times as much work (4x) • The same amount of work • Twice as much work (2x) • Half as much work (½x)

Question #16 • If an object has kinetic energy, then it also must have • Momentum • Acceleration • Force • Impulse • None of these

Question #17 • How much gravitational potential energy does a 120 kg person have on top of a 25 m building?

Question #18 A 5000 N piano is lifted 1 m in 5 seconds. How much power did it take?

Question #19 An sack is raised 3 m above the floor. It has a mass of 2 kg. What is its PE? 3m

Question #20 A car moves 4 times fasterthan an identical slower car. The fast car has _______ the KE. a. Half b. twice c. 4 times c. 16 times

Question #21 • Fill in the missing energy! PE 30 J KE = ? KE =?

Momentum, Energy, Power, & Work Whiteboard Review