G4: How things move

An object in motion always changes its position and may change its direction.

• True

• False

Fill in the blank: The speed of an object is determined by the ______ it travels in a unit of time.

• distance

• time

• mass

• volume

The drawing below shows Eric releasing two cars at the top of a ramp. Which statement best describes what happens to the cars as they leave the bottom of the ramp?

• They speed up.

• They stop moving.

• They start spinning.

• They change direction.

Which two measurements are needed in order to calculate the speed of a moving object?

• height and mass

• time traveled and mass

• height and distance traveled

• distance traveled and time traveled

Which of these is always changing with an object in motion?

• direction

• energy

• position

• speed

Marc is at the bowling alley and is wondering how he could figure out the speed of the ball as he rolls it down the lane toward the pins. Which two tools would he need to find the speed of the bowling ball?

• ruler and thermometer

• scale and thermometer

• meter stick and stopwatch

• graduated cylinder and scale

Kim and Heidi are playing marbles. Kim rolls her marble toward the target, but it suddenly moves to the left and misses the target. Heidi looks at the ground and sees a small pebble where the marble was rolling. Which change did the pebble cause in the marble?

• The pebble caused the marble to speed up.

• The pebble caused the marble to bounce up.

• The pebble caused the marble to stop its motion.

• The pebble caused the marble to change direction.

Eric is racing two toy cars down ramps. The ramps are the same height and the same distance, but one car is heavier than the other. Eric predicts the heavier car will travel faster than the lighter car. How can Eric determine which car has the greater speed?

• measure the time it takes the cars to travel the same distance

• measure the distance the cars travel

• measure how long the cars travel

• measure how far the cars travel in the same amount of time

Phillipe is playing baseball. The pitcher throws the ball, and Phillipe prepares to hit the ball with his bat. What is the ball doing right before Phillipe hits it?

• It is speeding up.

• It is slowing to a stop.

• It is changing its position.

• It is changing its direction.

Two cars are racing on a 1 mile track. The red car reaches the finish line after 45 seconds. The black car takes 37 seconds to reach the finish line. Which car had the greatest speed?

• The red car had more speed.

• The black car had more speed.

• Both cars had the same speed.

• You can't tell which car had more speed.