Exploring the Forces of Motion and Gravity

What force pulls objects toward the center of the Earth?

• Magnetism

• Gravity

• Friction

• Air resistance

What is the force that opposes the motion of objects through the air?

• Gravity

• Magnetism

• Air resistance

• Friction

Which of the following is NOT a force?

• Speed

• Friction

• Gravity

• Magnetism

What happens to the motion of an object if the forces acting on it are balanced?

• It speeds up

• It slows down

• It changes direction

• It stays the same

What is the force that acts between surfaces that are in contact and opposes motion?

• Gravity

• Friction

• Air resistance

• Tension

Which of the following would increase the gravitational force between two objects?

• Decreasing the mass of one object

• Increasing the distance between the objects

• Increasing the mass of one object

• All of the above

Which of the following statements about gravity is true?

• Gravity only affects objects on Earth

• Gravity is a force that exists between any two masses

• Gravity is stronger when objects are further apart

• Gravity can be turned off

What unit is used to measure force?

• Meters per second (m/s)

• Kilograms (kg)

• Newtons (N)

• Joules (J)

If you slide a hockey puck on ice, it will eventually stop because of:

• Gravity

• Air resistance

• Friction

• Magnetism

What does Newton's first law of motion state?

• For every action, there is an equal and opposite reaction

• Force equals mass times acceleration

• An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a force

• The acceleration of an object is directly proportional to the net force acting on it