Science Semester 2 Final
A cross country runner runs 10 km in 40 minutes what is his average speed?
0.25 km/min
A softball pitcher throws a ball at 42 m/s if the battery is 18 m from the picture approximately how much time does it take for the ball to reach the batter?
0.43 seconds
Silver has a resistance of 0.01980's. What voltage would produce a current of 100 amps?
1.98 V
A 5 kg medicine ball is thrown up word at a speed of 2 m/s. How much energy does it have?
10 J
How much force is required to lift a rock a vertical distance of 8 m if 80 J of work were done?
10 N
When a car traveling at 30 m/s it hits the gas pedal, it speeds up to 65 m/s and 3.5 seconds. What is the cars acceleration during that time?
10 m/s squared
A group of bike riders took a four hour trip during the first three hours they traveled a total time of 50 km, but during the last hour they traveled only 10 km. What was the groups average speed for the entire trip?
15 km/hr
Find the acceleration of the bicycle list in the graph to the right
15 m/s^2
A 500 N force is applied to a 25 m/s object. The mass of the object is
20 kg
What is the potential energy of a 55 kg box that is sitting 8 m above the ground
4312 J
What is the current produced by a 9 V battery flowing through a resistance of 0.2 ohms?
45 Amps
A high-speed train travels with an average speed of 227 km/h the train travels for two hours, how far does the train travel?
454 km
A constant force of 2 N is used to push a box 4 meters across the floor. How much work is done?
8 J
Find the acceleration of a car that goes from 32 m/s to 96 m/s in 8 seconds
8.0 m/s^2
A man wearing 800 N is standing on a chair. In order to support the man, what force is the chair exerting
800 N up
An object has a velocity of 9 m/s and a mass of 20 kg. What is the kinetic energy of the object?
810 J
What is the weight of a person with a mass of 95 kg
931 N
Which circuit below contains the greatest voltage?
A circuit with a current of 25 amps and a resistance of 16 ohms
Current
A flow of electric charge
What is an example of something that has a lot of inertia?
A teacher
And object that is falling freely has a constant what?
Acceleration
For any object, the greater the force that's applied to it, the greater it's ____________ will be.
Acceleration
The upward force on an object falling through the air is...
Air resistance
Carl and Joanne are playing catch. Carl throws a fastball to Joanne and it hurts Joannes hand. Why is this the case?
Greater the acceleration, the greater the force
When an object is dropped what happens to potential and kinetic energy as it falls?
Greatest potential energy goes down, kinetic energy goes up
Momentum describes
How much force is needed to change an objects motion
And object that has kinetic energy must be...
In motion
Which of the following will increase the resistance of a wire?
Increasing the temperature of the wire
What process is the method by which a neutral object obtains an electrical charge?
Induction
If a card were to quickly be pulled off of a cup what property would explain why the coin falls into the cup rather than moving with the card?
Inertia
The speed you read on a speed-diameter is...
Instantaneous speed
A material through which electrons do not flow easily is an
Insulator
Which of the following is not a potential energy?
Kinetic
Temperature measures the average __________ Of the particles in a material
Kinetic energy
A baseball player swings his bat and misses the ball but it's a fly that was hovering over home plate. Thanks acceleration of the fly compared to what the acceleration of the balls would have been with the same force applied to it would be......
Larger
The sum of kinetic energy and potential energy within the system is called...
Mechanical energy
Kinetic energy is...
Moving energy
Electric charges always flow from ________ areas to ________ areas
Negative to positive
Particles in the atom that have no charge
Neutrons
The relationship among mass, force, and acceleration is explained by
Newton's 2nd Law of Motion
Which of the following laws of motion states, " to every action there is an equal but opposite reaction"?
Newton's third law
Circuit that has more than one pathway for current to travel through
Parallel circuit
Mr. Robinson and his class are conducting an experiment. The class needs to choose a good insulator. Which of the following could be used as an insulator?
Plastic plate
An object in motion must be undergoing a change of....
Position
Positively charged particles in an atom
Protons
Thermal energy is transferred to the solar panel by....
Radiation
Circuit that has only one pathway for current to travel through
Series circuit
What would be a not good insulator for electrical charge?
Skin
When a ball is dropped it bounces until it eventually stops. Why does this happen?
Some of the balls energy is converted to other forms, such as thermal and sound
Which of the following best describes how a swimmer moves through the water?
The swimmer pushes backwards on the water and the water pushes with an equal force but opposite back from the swimmer?
And astronaut is planning a trip to a newly discovered planet. According to the law of universal gravitation, the astronauts wait on the new planet will be greater than his weight on earth if...
The new planet has more gravity than earth
A student drops a father and a rock at the same time from Mrs. Taylor's window. If air resistance wasn't a factor, what should she observe?
The rock and feather fall at the same rate
Ferromagnetism
The strong attraction of a substance to a magnetic field
Compared to the inertia of the 2 kg ball, the inertia of 4 kg ball is...
Twice as great
Green plants convert light energy from the sun into _______ During photosynthesis
chemical potential energy
The law of ____________________ states that energy cannot be created or destroyed.
conservation of energy
Negatively charged particles in an atom
electrons
The size of the gravitational force between two objects depends on their....
masses and the distance between them
The function of a generator is to change...
mechanical energy to electrical energy
The rate at which work is done is called
power
The mechanical energy of a coconut falling from a tree __________.
remains constant
The kinetic energy of an object increases as its __________ increases.
speed
Grounding
Allowing charges to move freely along a connection between a conductor and the ground.
Where would a roller coaster have the greatest potential energy?
At the top of the hill
What requires more work? A. Pushing a box with a force of 150 N a distance of 15 m B. Lifting a 20 kg mass of distance of 10 m
B
When two forces on the same object equal and opposite, these forces are called ___________ forces
Balanced
A group of students is playing a tug-of-war. The students on both sides of the roads are. With equal force of that the rope is not moving. This is an example of...
Balanced forces
Consider a watermelon that starts from rest and just dropped straight down from a tall building. Air resistance can be ignored. Which statement about the watermelons in motion is false? A) The watermelon falls with a constant velocity B) The watermelon has a positive acceleration C) After two seconds it's velocity is 19.6 m/s D) The watermelons acceleration due to gravity is 9.8 m/s squared
C
Which of the following types of energy does not directly result when a rocket is set off using chemical energy? A. Potential B. Sound C. Radiant D. Thermal
C
Which statement is false? A. Weight depends on the force of gravity B. Mass is the amount of matter in an object C. Weight Is a constant no matter where you are located D. Mass is a constant no matter where you are located
C
The law of conservation of charge states...
Charge cannot be created nor destroyed but it can be transferred
Energy stored in food would be considered
Chemical potential
And object in motion with no unbalanced forces acting on it will...
Continue to move in its path at a constant speed
The __________ Energy of an object depends on both the height and the mass of an object
Gravitational potential
The __________ Energy of an object increases with its height.
Gravitational potential
If you ride your bike down the street road for 500 m then turn around and ride back to your starting point your distance is ____________ Your displacement
Greater than
This exerts a force that causes other electric charge to move
Electrical fields
Which two areas of physical signs are closely related to the development of electric motors and generators?
Electricity and magnetism
Temporary magnet made by placing a piece of iron inside a current carrying
Electromagnets
A device that detects electrical charge on an object
Electroscope
An example of energy conversion from kinetic to thermal energy would be
Friction
This contains a piece of metal that melts if it gets too hot in order to open a circuit...
Fuse
A car moves around a wide turn going 45 mph the whole time the car has a constant....
Speed
The graph at the right represents the motion of a car. According to the graph as time increases, the speed of the car....
Stays the same
Potential energy is......
Stored energy
What would represent a device that can easily turn the circuit on or off?
Switch
The horses on a carousel or Merry go round or accelerating because......
The direction of the horses motion is constantly changing
A firefighter feels the hose pushing backwards onto him as he uses it to put out a fire what is the most likely cause of this?
The escaping water exerts an equal and opposite force on the hose
3 m/s north is an example of...
Velocity
A device that measures the voltage difference in a circuit
Volt meter
The force or push that causes electric charge to move is called
Voltage difference