Understanding Forces: Contact and Non-Contact

What unit is used to measure force?

• Joules

• Newtons

• Meters

• Kilograms

What does the magnitude of a force indicate?

• Its color

• Its weight

• Its temperature

• Its strength

What makes a quantity a vector quantity?

• It can only be positive.

• It is measured in meters.

• It has both magnitude and direction.

• It has only magnitude.

What is a key characteristic of contact forces?

• They are always repulsive.

• They only act in a vacuum.

• They require objects to be touching.

• They act at a distance.

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

• Friction

• Electrostatic force

• Magnetic force

• Gravity

What is required for friction to act between two objects?

• They must be electrically charged.

• They must be of different materials.

• They must be in a vacuum.

• They must be touching.

What is the normal contact force?

• The force of gravity acting on an object.

• The force a surface exerts to support the weight of an object.

• The force exerted by a rope when it is pulled.

• The force between two magnets.

What is the role of the normal contact force?

• To pull objects closer

• To support the weight of objects

• To push objects apart

• To prevent objects from moving

Which force is a non-contact force?

• Air resistance

• Gravitational force

• Tension

• Friction

Which force acts through empty space?

• Tension

• Air resistance

• Gravitational force

• Friction