1st quarter
Energy
2nd Quarter
Forces
5 types of potential
100
Working in a science laboratory is safe if you follow some simple safety precautions. Which of the following procedures can be dangerous in a science laboratory? a. Picking up pieces of broken glass b. Wearing goggles when heating liquids c. Wearing gloves when cleaning up spills d. Tying back long hair when heating substances.
a. Picking up pieces of broken glass
100
A student holds a ball at the top of a ramp. He lets go of the ball and the ball speeds up as it rolls down the ramp. How do the potential energy and the kinetic energy of the ball change as the ball rolls down the ramp? Why? a. The potential energy decreases and the kinetic energy increases. The potential energy is transformed into kinetic energy as the ball rolls down the ramp. b. The potential energy decreases and the kinetic energy increases. As soon as the ball starts moving it no longer has potential energy; it has only kinetic energy. c. The kinetic energy and potential energy both decrease. Both forms of energy are used up as the ball moves and are not transformed into any other form of energy. d. The potential energy and the kinetic energy both stay the same. One form of energy cannot be transformed into a different form of energy.
a. The potential energy decreases and the kinetic energy increases. The potential energy is transformed into kinetic energy as the ball rolls down the ramp.
100
Like charges always a. Repel each other b. Attract each other c. Cancel out each other’s charge d. Point toward the north pole
a. Repel each other
100
One person is pushing on a box with a force of 100 newtons, and another person is pushing on the same box in the opposite direction with a force of 90 newtons. What is the resulting force on the box? a. The ratio of the two forces b. The sum of the two forces c. The product of the two forces d. The difference between the two forces
d. The difference between the two forces
100
A student has two identical rubber bands. She stretches each rubber band around two pegs so that one rubber band is stretched a little bit and the other rubber band is stretched a lot. When the rubber bands are stretched, which rubber band has more elastic energy? a. The rubber band that is stretched a little has more elastic energy. b. The rubber band that is stretched a lot has more elastic energy. c. The rubber bands have the same amount of elastic energy no matter how much they are stretched. d. Neither rubber band has any elastic energy.
b. The rubber band that is stretched a lot has more elastic energy.
200
If you do not understand a direction or part of a lab procedure, you should a. Figure it out as you do the lab. b. Try several methods until something works. c. Ask the teacher before proceeding d. Skip it and go on to the next part.
c. Ask the teacher before proceeding
200
Electricity is produced in a hydroelectric plant when moving water turns a turbine. Which describes this energy transformation from the turning turbine to electricity? a. kinetic energy into electric energy b. nuclear energy into electric energy c. thermal energy into electric energy d. chemical energy into electric energy
a. kinetic energy into electric energy
200
The primary reason an ice cube feels cold to the touch is that a. conduction causes coldness to leave the ice. b. radiation from the hand enters the ice. c. conduction causes heat to leave the hand. d. convection currents leave the hand.
c. conduction causes heat to leave the hand.
200
Which direction does the force of friction go? a. Straight down b. Perpendicular to the surface c. In the same direction as the movement d. In the opposite direction as the movement
d. In the opposite direction as the movement
200
A girl and a boy are playing on a teeter-totter. They both weigh the same. While the boy is down and the girl is up, which child has more gravitational potential energy? a. The boy has more gravitational potential energy. b. The girl has more gravitational potential energy. c. They have the same amount of gravitational potential energy. d. They do not have any gravitational potential energy.
b. The girl has more gravitational potential energy.
300
How many centimeters are 365 millimeters? a. 3.65 cm b. 36.5 cm c. 3,650 cm d. 3.065 cm
b. 36.5 cm
300
The batteries in some new flashlights can be charged by turning a handle. Once the battery is charged , the flashlight can be turned on. Which of the following describes the energy transformations that occur in this process? a. Mechanical energy to chemical energy to electrical energy to radiant energy b. Heat energy to chemical energy to electrical energy to radiant energy c. Mechanical energy to chemical energy to electrical energy to sound energy d. Mechanical energy to electrical energy to sound energy
a. Mechanical energy to chemical energy to electrical energy to radiant energy
300
A wave with a high frequency and a low amplitude will be a. Soft and high pitched b. Soft and low pitched c. Loud and high pitched d. Loud and low pitched
a. Soft and high pitched
300
Two students are having a tug-of-war. One student is pulling to the west with a force of 410 netwons. The other student is pulling to the east with a force of 320 newtons. What is the result of the tug-of-war? a. The knot in the rope will remain stationary? b. The knot in the rope will move west c. The knot in the rope will move north d. The knot in the rope will move east
b. The knot in the rope will move west
300
How can you decrease the amount of gravitational potential energy of a book on a book case? a. put it on a higher shelf b. put it on a lower shelf c. increase its mass d. open the book
b. put it on a lower shelf
400
How many centimeters are in 5.6 meters? a. 56 centimeters b. 0.56 centimeters c. 560 centimeters d. 506 centimeters
c. 560 centimeters
400
What does the Law of Conservation of Energy say about the energy in the universe? a. Energy is constantly created b. Energy is constantly destroyed c. Energy is never created or destroyed d. Energy stays in the same form.
c. Energy is never created or destroyed
400
Electric force varies depending on the a. Charge and distance between charged objects b. Charge and mass of charged objects c. Height and mass of charged objects d. Mass and distance between charged objects
a. Charge and distance between charged objects
400
Which direction does the force of gravity go? a. Straight down b. Perpendicular to the surface c. In the same direction as the movement d. In the opposite direction as the movement
a. Straight down
400
The gravitational potential energy of an object depends on which of the following? a. Both the mass of the object and the object’s distance from the center of the earth b. The mass of the object but not the object’s distance from the center of the earth c. The object’s distance from the center of the earth but not the mass of the object d. Neither the mass of the object nor the object’s distance from the center of the earth
a. Both the mass of the object and the object’s distance from the center of the earth
500
As a ball rolls down a hill, where will it have the greatest kinetic energy and the least potential energy? a. top of the hill b. midway down the hill c. at the bottom of the hill d. at the far end of the straight path after the hill
c. at the bottom of the hill
500
Jackie used a portable electric drill to remove screws from a broken wooden table. He noticed that the screws holding the table together were warm to the touch after being removed from the wood. What explains this phenomenon? a. Mechanical energy from the drill was converted into thermal energy due to friction. b. Electrical energy from the drill was converted into chemical energy due to resistance. c. Thermal energy from the drill was converted into mechanical energy due to inertia. d. The process of removing the screw concentrated the thermal energy that was already present in the wood.
a. Mechanical energy from the drill was converted into thermal energy due to friction.
500
Darren is holding a Van de Graff generator. After a while, his hair starts to stand on end. Why does this occur? a. He accumulated protons in his hair and the individual hairs attracted to one another b. He accumulated electrons in his hair and the individual hairs attracted to one another. c. He accumulated electrons in his hair and the individual hairs repelled one another. d. He accumulated protons in his hair and the individual hairs attracted one another.
c. He accumulated electrons in his hair and the individual hairs repelled one another.
500
What direction does the resistance of a surface go? a. Straight up b. Perpendicular to the surface c. In the same direction as the movement d. In the opposite direction as the movement
b. Perpendicular to the surface
500
A coconut falls from a tree. Which coconut will have the greatest gravitational potential energy? a. One buried in the sand b. One landing on the sand c. One falling from a tree d. One at the top of the tree
d. One at the top of the tree
M
e
n
u