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Physics Jeopardy

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Work & Power

Simple Machines

energy

Energy

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Final Jeopardy

- How many joules of work are done on an object when a force of 10N pushes it 5m?

- 50 J

- How much work is done on a 50 N rock that you carry horizontally across a 10 m room?

- Zero Joules of Work

- How much power is expended if you lift a 50 N rock 10 m in 2 second?

- 250 Watts

- Marissa is jogging up a winding trail on a mountain that has a height of 200 m. When she finally gets to the top a sign tells her that the trail has a distance of 800 m. If she has a mass of 48 Kg, how much Work has she done?

- 96000 Joules

Sam, who has a mass of 70Kg, races Jarvis, who has a mass of 50Kg, up a hill with a height of 10m. If Sam gets up the hill in 5s and Jarvis gets up the hill in 3.6s, who is more powerful?

- Sam’s power was 1400 Watts and Jarvis’s power was also 1400Watts, so they had the same amount of power.

The ratio of output force to input force of a simple machine is called the:

- gear ratio
- fulcrum
- efficiency
- mechanical advantage.
- pivot point

d) Mechanical advantage

How much less work does Jack do when he pulls a rope of a pulley down .7m and lifts a mass of 540N that is supported by 4 ropes?

The work on both sides are the same.

If Erin can only push with a force of 8N, how far out must she be from the fulcrum of the lever if she is lifting a mass with a weight of 40N that is 30cm from the fulcrum?

150cm

You build a lever to help you lift a tank. The tank weighs 4000 N, and you need to lift it 2 meters. You decide on a whim to analyze what you have done after lifting the tank and realize that you moved your end of the lever a whopping 20 meters, but had to apply a 500 N force. What did you find out the efficiency of your lever was?

80 % efficiency

How high does a 300N weight get lifted if it is supported by a system of 4 pulleys like the system below, and Mark pulls the rope .5m?

Irvin

300N

.125m

Potential energy is the energy an object has because of its ______.

- Speed
- location
- size
- temperature
- density

- B) Location

If an object has kinetic energy, then it also must have _______.

- Impulse
- momentum
- acceleration
- Force
- None of the above

b) momentum

A toy cart moves with a kinetic energy of 30J. If its speed is doubled, what will its kinetic energy be?

- 120J

If Barbora, with mass of 46Kg jumps off the top of the high school, height: 20m, how much kinetic energy does she have when she has fallen a quarter of the distance?

- 2300 J

A ball slides down the frictionless track shown below. The ball has no velocity at position F.

G

E

F

C

A

B

a)To what point does the ball rise on the opposite incline?

b)At what point(s) in the diagram is the speed at a maximum?

c)At what point(s) is the kinetic energy at a maximum?

d)At what point(s) is the speed zero?

e)At what point(s) is the potential energy at a minimum?

f)At what point(s) is the potential energy at a maximum?

g)At what point(s) is the momentum at a maximum?

a) E

b) B

c) B

d) F & E

e) B

f) F & E

g) B

If you stand on top of a building and figure out that you have a PE of 4000 Joules, what would your KE be right before you hit the ground?

KE = 4000 J

How much work does it take to lift a 400 N slab of brick a height of 5 meters?

W = 200 J

How much kinetic energy do you have if you are running at a speed of 5 m/s and have a mass of 65 kg?

KE = 812.5 J

What is your speed if you have a KE of 32000 J and a mass of 70 kg?

v = 30.2 m/s

What is your KE half way down a hill if the hill has a height of 25 m and you have a mass of 55 kg?

KE = 6875 J

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Why will a looped coil attached to a DC power supply not work as a good motor?