Particles with the ___________ charges repel from each other.

Which items are good insulators?

You and your friends climb to the top of a hill to sled ride. You friend pushes you down the hill and end up at the bottom. When do you have the greatest amount of kinetic energy?

A ______ is formed when an electric current passes through an unbroken path of conductors.

For a circuit to work, it must be...

Which two objects use electrical energy to move an object?

Which two objects use electrical energy to move an object?

Which force must the person overcome to push the box across the floor?

A force is best defined as

Describe what is occurring in the image.

At an auto junk yard, a magnet is used to move old cars. How does this magnet work?

In a game of tug-of-war, four friends are pulling on the rope. Describe what is occurring in the image.

During the winter, it often snows in parts of the United States. During this time, car accidents are more common. Why do car accidents occur more often when roads are covered in snow and ice?

While riding his bike from his house to the baseball field, a boy needed to turn left onto a different neighborhood street. "Turning left" is an example of

An astronaut in the future traveled to a distant planet whose mass is 20 times greater than that of Earth. The astronaut noticed that she could not jump as high on this new planet. What is a possible explanation for this?

Shari is using two toy cars to experiment with force and motion. The cars have different masses. Car A has a mass of 100 grams. Car B has a mass of 300 grams. Shari pushes each car forward using the same amount of force. Which car will travel farther?

Sam was riding his bike up a hill. His pedaling caused the bike to move. What type of force did Sam apply to the pedals to make his bike move?

As part of a science project, Samuel slides several different objects down a ramp. The objects Samuel uses are a magnet, a marble, a wooden block, and a metal car. Which two forces are acting on all the objects as they slide down the ramp?

Ms. Adler writes the following description on the board.

1. a pendulum swinging from side to side

2. a motionless tire swing

3. two people exactly balanced on a seesaw

During which of these situations are unbalanced forces at work?

Mr. Brown gave Jen's lab group a ramp and a toy car. He placed large sheets of waxed paper, plastic wrap, glass, and artificial grass on a table. The group was asked to cover its ramp with the material they thought would slow down the car the most. Which material should they use?

Mr. Gates mops the gymnasium floor every day. When he finishes mopping, he puts up the sign below. The effect of which force is weakened when the floor is wet?

Bar magnets have a north pole (N) and a south pole (S). Latisha places a bar magnet on three small straws so that it can roll. Her setup is shown below. Placing which of the following objects at point X will cause the bar magnet to move away from point X?

Mrs. Smith set up four ramps. The ramps had the heights shown here. Mrs. Smith held up a toy car. She explained that the students were going to determine if ramp height affects how far a car travels in 15 seconds. The students were told not to push the cars down the ramp. What force can the students use to move the cars down the ramp?

Stephanie started pushing a bookcase across the room, as shown in picture 1. Then, she removed the books and continues pushing with the same force and direction in picture 2. How does removing the books affect the motion of the bookcase?

Two teams of students are pulling on a long rope with a flag in the middle. The teams pull in opposite directions to try to move the flag across a line on the ground, but the flag does not move. Which statement explains why the flag in the middle of the rope does not move?

Driving to a restaurant with a load of groceries, the driver has to come to a quick stop. When the driver steps on the brakes, the groceries slide forward in the trunk. Which object is likely to slide the shortest distance?

A student is completing an experiement with boxes of different masses. She applies a force of 5 newtons to each box and measures the effect on each box by recording the distance it moves.

Box Mass(grams)

1 236

2 489

3 657

4 813

Which box will be the least affected by the applied force?

Students are experimenting with a toy car on a smooth, wooden ramp that has a height of 1 meter. They apply a force of 2 newtons to the car to push it down the ramp. The students measure how fast it rolls down the ramp. They want to try to get the car to go even faster down the ramp. What could the students do in order to increase the speed of the car?

In order to win a game of tug-of-war, what must happen?

A team of movers needs to move a heavy sofa. One mover puts slippery pads under each leg of the sofa. This allows the sofa to slide easily across the floor. How does the use of the pads change the forces involved in moving the sofa?

Which of the following make up a galaxy? Select all that apply

Which objects give off the most light and heat in a galaxy?

The star Viktor-Omega is 1,000 times hotter and brighter then the star Zena-5. However, the Star Zena-5 appears much brighter when you look up at the night sky. Why does Zena-5 appear so much brighter?

Mars is about the size of two moons. However, it appears to be about 1/20th the size of the moon when it is visible at night? Why would Mars not look bigger then the moon in the night sky?

identify the object: these objects are smaller, icy, and hurling through space. When they get near a planet or the sun they have a shimmering tail as they melt.

identify the object: massive round objects that are comprised of gases. They are extreamely cold and take a very longtime to orbit around the sun.

identify the object: this is the largest object in the entire solar system. It is very bright, hot, made of gases, and provides heat to all of the planets.

Identify the object:

an oddly shapen, smaller, rocky objects that orbits around the sun. There is a large area between Jupiter and mars that you can find a lot of these rocky mishapen objects floating through space

Identify the object:

This object is smaller then most planets and will even orbit around a planet. Sometimes there can be none, one, two, or even 79 of these orbiting around a single planet

Peter has learned that many stars are actually larger than the sun. If this is true, why do these stars appear like points of light in the sky?

Which of the following is true of the sun?

Arelly and Maritza are trying to write a general description of a planet that could apply to any planet in our Solar System. So far, their list looks like this:

a. orbits the sun

b. is nearly round

c. rotates on its axis