Yr7 Frictional and gravitational forces quiz

What are 2 factors that determine the amount of friction between 2 objects?

• Force and roughness between surfaces

• The color and brightness of the objects

• How smelly or not smelly the objects are

• Whether Grogu is using his levitation powers or not... May the Force be with you, always!

Answer explanation

Force and roughness between surfaces determine the amount of friction between 2 objects.

What are the main types of friction?

• Static and kinetic

• North and south

• Positive and negative

• Heavy and light

Answer explanation

Friction is classified into static friction (when objects are not moving) and kinetic friction (when objects are in motion).

Which factor does not affect the amount of friction between two surfaces?

• The type of materials in contact

• The weight of the object

• The color of the materials

• The surface area in contact

Answer explanation

The color of the materials does not affect the amount of friction between two surfaces.

What is the primary difference between friction and gravity?

• Friction is a force that always opposes motion, while gravity is a force that always attracts objects towards each other.

• Friction can only act at a distance, while gravity can act when objects are touching.

• Friction is stronger than gravity.

• Friction is not affected by the mass of the objects, while gravity is.

Answer explanation

Friction is a force that always opposes motion, while gravity is a force that always attracts objects towards each other.

How does friction affect the motion of a sliding object?

• It increases the speed of the object.

• It decreases the speed of the object.

• It does not affect the speed of the object.

• It makes the object change direction.

Answer explanation

Friction between a sliding object and its surface creates resistance, which decreases the speed of the object.

Which factor does not affect the gravitational force between two objects?

• The color of the objects

• The mass of the objects

• The distance between the objects

• The shape of the objects

Answer explanation

The color of the objects does not affect the gravitational force between two objects. The mass, distance, and shape are factors that do influence the gravitational force.

What is the difference between mass and weight?

• Mass is a measure of how much matter an object has, while weight is the force of gravity on an object.

• Mass can change when an object goes to space, while weight remains the same.

• Weight is measured in kilograms, while mass is measured in newtons.

• There is no difference; mass and weight are the same.

Answer explanation

Mass is a measure of how much matter an object has, while weight is the force of gravity on an object.

Which of the following is a way to reduce friction?

• Use lubricants

• Increase the surface roughness

• Use heavier objects

• Increase the surface area in contact

Answer explanation

Using lubricants is a way to reduce friction by creating a slippery layer between surfaces, decreasing the resistance to motion.

What type of friction occurs when an object just starts moving from rest?

• Rolling friction

• Static friction

• Kinetic friction

• Fluid friction

Answer explanation

Static friction occurs when an object just starts moving from rest, providing the initial resistance to motion.

Which of these is not a typical effect of friction?

• Producing heat

• Causing objects to stop

• Generating electricity

• Wearing out materials

Answer explanation

Generating electricity is not a typical effect of friction. Friction usually produces heat, causes objects to stop, and wears out materials.