Unit 1- Science Review

Boards were placed on the curb to race identical toy cars on. One board had a rough surface. The other board was smooth. The car on the smooth surface won 5 out of 5 races. The winning car was faster than the other car because of

• Friction

• Gravity

• Bigger tires

• Pressure

If a student needed to measure the height and mass of an object, what tools would they use?

• meter stick and graduated cylinder

• balance and thermometer

• graduated cylinder and thermometer

• balance and meter stick

What force will cause the car to stop?

• Rolling

• Gravity

• Magnetism

• Friction

A student timed how fast a basketball, a golf ball, and a baseball rolled down a ramp that was four inches high and 3 inches wide. He recorded his observations. What should he do next?

• Repeat this investigation using 3 different balls.

• Change the width of the ramp.

• Change the height of the ramp.

• Repeat this identical procedure several times.

Based on the data, place the magnets in order from weakest to strongest.

• Y, Z, X

• X, Z,Y

• Z,Y, X

• X,Y,Z

A student wants to test the force of magnetism by placing objects on top of a piece of cardboard and then moving them with a magnet placed under the cardboard. Which items will help the student with this investigation?

• a penny, aluminum foil, and iron filings

• an iron nail, a paper clip, and a steel screw

• a plastic spoon, foil, and cotton ball

• toothpicks, a paperclip, a penny

When riding a bike, which force most likely causes the bike to go forward?

• Magnetism pulling the bike forward

• Pushing the pedals

• Gravity pulling the bike to the ground

• Pull the bike handles

A teacher dropped a box of paper clips. How will a magnet be helpful to the teacher?

• Gravity will cause the paper clips to fly to the magnet.

• Friction will push the paper clips away from the magnet.

• Magnetism will pull the paper clips to the magnet.

• The magnet will melt the paper clips.

A student is blowing up balloons and accidentally lets one go, sending it flying around the room. He wants to find out how the amount of air inside the balloon affects how long it will fly around when he lets go. Which of the following investigations will help him answer his question?

• Blow different amounts of air into different types of balloons, timing how long each balloon flies around the room.

• Blow the same amount of air into the same kind of balloons, timing how long each balloon flies around the room.

• Blow different amounts of air into the same kind of balloons, timing how long each balloon flies around the room.

• Blow the same amount of air into different types of balloons, timing how long each balloon flies around the room.

A student has a magnet and four different objects. He places the magnet near each of the objects and records whether the objects attract, repel, or stay the same. What is this experiment designed to answer?

• How does the gravitational force of different objects affect a magnet?

• Which objects will respond to a magnetic force?

• How can magnetic force affect an object's shape?

• Which type of magnet will apply force on an object?