Forces and Motion

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

• Lifting a heavy object

• Pulling a door open

• Pushing a door open

• Sitting on a chair

What is friction?

• Force that opposes motion

• Force that causes motion

• Force that has no effect on motion

• Force that supports motion

Which of the following is an example of an unbalanced force?

• Pushing a car to make it move forward

• Pulling a car to make it move backward

• Leaving a car parked on a flat surface

• Sitting in a car while it is stationary

What happens when two forces are balanced?

• The net force acting on the object is doubled.

• The net force acting on the object is zero.

• The net force acting on the object is negative.

• The net force acting on the object is undefined.

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

• Pulling a door open

• Pushing a door open

• Lifting a heavy object

• Throwing a ball

What is the force that opposes motion between two surfaces?

• friction

• inertia

• magnetism

• gravity

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

• A person pulling a heavy object with more force than the object is pushing back.

• A person pushing a wall with less force than the wall pushes back.

• A person pushing a wall with no force at all.

• A person pushing a wall with the same amount of force that the wall pushes back.

What is an unbalanced force?

• A force that only affects the shape of an object, but not its motion.

• A force that causes a change in an object's motion or shape.

• A force that does not cause any change in an object's motion or shape.

• A force that causes an object to move in a straight line without any change in its shape.

Which of the following is an example of a force?

• magnetism

• color

• gravity

• temperature

What is the force that pulls objects towards the center of the Earth?

• magnetism

• friction

• electricity

• gravity