Exploring Forces: Contact and Noncontact

What is a force that pulls objects toward each other?

• Friction

• Gravity

• Magnetism

• Electricity

Which of the following is an example of a noncontact force?

• Pushing a door

• Pulling a rope

• Gravity pulling an apple to the ground

• Kicking a ball

How does friction affect the motion of an object?

• It speeds up the object

• It slows down the object

• It changes the color of the object

• It makes the object heavier

Which of the following statements is true about magnetic forces?

• They only work when objects are touching

• They can attract or repel objects without touching

• They only attract objects

• They only repel objects

If two forces acting on an object are equal in size but opposite in direction, what type of forces are they?

• Unbalanced forces

• Balanced forces

• Magnetic forces

• Gravitational forces

Explain how gravity and weight are related.

• Gravity is the force that gives objects weight

• Weight is the force that gives objects gravity

• Gravity and weight are not related

• Weight is the opposite of gravity

Describe what happens to an object when unbalanced forces act on it.

• The object remains at rest

• The object changes its motion

• The object becomes lighter

• The object becomes heavier

Which of the following scenarios best illustrates friction in action?

• A magnet sticking to a refrigerator

• A ball rolling on the ground and eventually stopping

• A leaf falling from a tree

• A balloon floating in the air

How can you increase the friction between two surfaces?

• Make the surfaces smoother

• Add a lubricant between the surfaces

• Increase the roughness of the surfaces

• Decrease the weight on the surfaces

What happens to the gravitational force between two objects if the distance between them increases?

• The gravitational force increases

• The gravitational force decreases

• The gravitational force stays the same

• The gravitational force becomes zero