Force and motion

Keisha has two large dogs and a small dog. The dogs like to play tug-the-rope together. Each of these three diagrams shows one way the dogs play together with the rope. Look at each arrow and the number that goes with it. They show the direction and amount of force each dog exerts on the rope. Which are unbalanced?

• Left

• Middle

• Right

• All of them

Keisha has two large dogs and a small dog. The dogs like to play tug-the-rope together. Each of these three diagrams shows one way the dogs play together with the rope. Look at each arrow and the number that goes with it. They show the direction and amount of force each dog exerts on the rope. What is the overall force and direction for the middle image?

• Left

• 8 N

• 32 N

• Right

• 9 N

• 39 N

• Left

• Right

Which combinations of forces would best move a large, heavy box across a room? Choose the three statements that apply.

• Two people push on the box from the same side
• Two people pull on the box from the same side
• One person pushes on one side of the box, and one person pulls from the other side of the box.
• One person pushes on one side of the box, and one person pulls from the same side of the box.

What is determined by the distance an object travels and the time it takes to travel that distance?

• Direction
• Mass
• Speed
• Force

• The road
• A traffic light
• The truck driver
• A roadside tree

• 10.62 hrs

• 0.09 hrs

• 26,550 hrs

• 0 hrs

Carmen is helping load furniture and boxes onto a moving truck. She picks up boxes of her things, places them on a cart, and pushes the cart to the moving van. Which term best describes the type of force Carmen uses?

• Contact
• Friction
• Gravity
• Noncontact

Ahmed saw all of these things as he walked to school this morning. Which one is an example of a force pushing downward toward the ground?

• A bird sat on a telephone wire.
• A woman moved her child from one place to another in a wagon.
• A man pulled weeds in his garden.
• A dog tugged on rope a child held.