Ch 7 Forces Quiz

Which of the following completes Kristopher’s table?

• A. X - Pulls; Y - Pushes

• B. X - Kinetic Force; Y - Potential Force

• C. X - Non-contact Forces; Y - Contact Forces

• D. X - Contact Forces; Y - Non-contact Forces

If the unequal opposing forces are applied to the cart at the same time, what will occur?

• The cart will move to the right.

• The cart will move to the left.

• The cart will alternate between moving left and right.

• The cart will remain stationary.

Gravitational forces affect all objects on Earth. Which of these factors would have the greatest effect on the gravitational force between two objects?

• A. the volumes of the objects

• B. the temperatures of the objects

• C. the distance between the objects

• D. the magnetic charges on the objects

Which statement best explains why the image is an example of balanced or unbalanced force?

• The image is an example of an unbalanced force because the forces act in opposite directions.

• The image is an example of a balanced force because the net force is 0 in the horizontal direction and vertical directions. The wagon will not move left or right, up or down.

• The image is an example of an unbalanced force because the forces have different magnitudes.

• The image is an example of a balanced force because net force is 30 N upward.

What does the gravitational force between two objects depend on?

• A. their shapes

• B. their speeds

• C. their masses

• D. their volumes

Your weight on the moon is about one-sixth of your weight on Earth. Why do you weigh less on the moon?

• The moon exerts a greater gravitational force because it is more dense than Earth.

• The moon exerts a smaller gravitational force because it has less mass than Earth.

• The moon exerts a greater gravitational force because it is closer to Earth than the Sun.

• The moon exerts a smaller gravitational force because objects are closer to its center than on Earth.

Which two factors determine the gravitational attraction between two objects?

• time and temperature

• shape and orbital speed

• color and hardness

• mass and distance

The picture below shows two cue balls that have bounced off the sides of a pool table and are heading toward each other. What will happen when the cue balls hit each other?

• The balls will pull each other, changing the motion and direction of each ball.

• The balls will push each other, changing the motion and direction of each ball.

• The slower-moving ball will pull the other ball, reversing the direction and position of the slower ball.

• The faster-moving ball will push the other ball out of the way, leaving the faster ball's direction unchanged.

A probe traveling through outer space is moving at a constant velocity. Which statement applies to the motion of this probe?

• An unbalanced force is acting on the probe, causing it to accelerate.

• The probe will undergo constant acceleration until a force acts on it.

• The probe will continue on its current path until an unbalanced force acts on it.

• The force that makes the probe move through space is equal to its mass divided by its velocity.

Look at the picture of a car tire below. Why are car tires made with deep treads like this one?

• To increase the amount of friction so the car moves faster.

• To decrease the amount of friction so the car moves faster.

• To increase the amount of friction so the car stays on the road.

• To decrease the amount of friction, so the car slides more easily.