Jeopardy

Formulas

100

A car can accelerate from rest to 27m/s in 9 seconds.  Find the car's acceleration.

acceleration = final speed - initial speed / time

so 27 - 0 / 9 = 3 m/s^2

200

What net force is needed to accelerate a 50kg cart at 15 m/s?

force = mass x acceleration so 50 x 15 = 750 N

300

Which has more momentum: a 225kg dolphin swimming at 5m/s, or a 300kg manatee swimming at 1.5m/s?  Show formula, all work and a sentence for full credit.

momentum = mass x velocity

momentum of the dolphin = 1125 kg x m/s

momentum of the manatee = 450 kg x m/s

The dolphin has more momentum

400

Your laundry basket weighs 35N and your room is 4m above you on the second floor.  It takes you 8 seconds to carry the laundry basket up.  What is your power? Show formula, all work and a sentence for full credit.

power = force x distance / time

power = 17.5 W

500

You do 30 Joules of work while using a hammer. The hammer does 25 Joules of work on a nail. What is the efficiency of the hammer? Round to the nearest whole percent.

Efficiency of the hammer is 83%

Vocabulary

100

What is stored energy based on an object’s position?

Potential Energy

200

What is a particle with no charge called?

A Neutron

300

The destruction of metal is called what? 

Corrosion

400

The energy an object has due to its motion is called what?

Kinetic Energy

500

The rate at which velocity changes is called what?

Acceleration

Measurement Conversion

100

Convert 8475 m to km

8.475 km

200

Convert 2.75 km to meters

2750 meters

300

Convert 3.85 km to meters

3850 meters

400

Convert 785 cm to meters

7.85 meters

500

Convert 2,896 meters to km

2.896 kilometers

Multiple Choice

100

When reading through a word problem, what is the first thing that has to be done?

a.       Write down the formula

b.      Close text read

c.       Show your work

d.      Write a sentence

B

200

How can you find the net force if two forces act in opposite directions? 

a.       Multiply

b.      Add

c.       Divide

d.      Subtract

D

300

What is it called when matter changes from a liquid to a gas?

a.       Condensation

b.      Freezing

c.       Evaporation

d.      Melting

C

400

A mixture in which particles can be seen and easily separated by settling or filtration is called a

a.       Colloid

b.      Suspension

c.       Solution 

B

500

If an atom gains an electron, it becomes a __________________ ion?

a.       Charged

b.      Covalent

c.       Negative

d.      Positive

C

Balancing Equations

100

___ H2  +  ___ N2    ___ NH3

3 H2 +  N2 = 2 NH3

200

____ S8  +  ___ O2  =  ___ SO2

S8 + 8 O2 =  8 SO2 

300

_____ P4  +  ____ O2  = ____ P2O5

P4 + 5 O2 = 2 P2O5 

400

____H2O2 = ___ H2O  +  ___ O2

2 H2O2 = 2 H2O + O2

500

____NO  +  ____O2  = ___NO2

2 NO + O2 = 2 NO2