Forces and Motion

What causes an object to fall to the ground?

• air resistance

• time

• gravity

• friction

A student measures the motions of a toy car. She measures the distance the car travels every 20 seconds for 2 minutes. At the end of the 2 minutes, she wants to show her data on a line graph. What should she put along the y-axis of her graph?

• position

• speed

• time

• distance

What information do you need in order to find the speed of a moving object?

• the mass of the object and the distance it moved

• the distance the object moved and the time it took to move that distance

• the position of the object and the force used to move it to that position

• the length of the object and the direction in which it moved

Your friend kicks a rolling ball with a certain force. Then you kick the same ball with a larger force. What will MOST LIKELY happen?

• The ball will move faster and farther when your friend kicks it.

• The ball will move faster and farther when you kick it.

• The ball will move more slowly and farther when you kick it.

• The ball will move faster and not as far when your friend kicks it.

Which tool can be used to measure the distance an object moved?

• meterstick

• spring scale

• watch

• compass

Which best describes the speed of a ball as it is thrown straight up into the air and comes back down?

• The ball goes up at a constant speed, stops, then comes down at a constant speed.

• The ball goes up at a constant speed, stops, and increases speed as it comes down.

• The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.

• The ball goes slower and slower as it goes up, stops, and then comes down at a constant speed.

What can cause a moving object to increase its speed in a forward direction?

• a force pushing on the object from the opposite direction

• a force that continually acts on the object in the direction the object is moving

• an increase in the mass of the object

• a decrease in the mass of the object

A student uses a rubber band to launch the four objects shown in the table.

Object Mass

paper clip 0.5 gram

piece of paper 1 gram

eraser 2 grams

rubber ball 10 grams

If the student pulls the rubber band back the same amount each time, which object will most likely move the fastest when launched?

• paper clip

• piece of paper

• eraser

• rubber ball

A pencil falls off of a desk. What moves the pencil toward the floor?

• mass

• friction

• gravity

• speed

A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is most responsible for causing the wagon to stop?

• A gravity acting on the wagon

• friction acting on the wagon

• the mass of the wagon

• the mass of the child