Forces and Effects

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

• Repulsion

• Magnetism

• Friction

• Gravity

Which force opposes the motion of an object through air ?

• Drag

• Thrust

• Lift

• Push

Explain the concept of normal force.

• Normal force is the force that acts perpendicular to the surface of an object.

• The normal force is the force exerted by a surface to support the weight of an object resting on it.

• Normal force is the force that causes an object to move horizontally.

• The normal force is the force exerted by an object to support the weight of a surface it rests on.

How does friction force affect the movement of objects?

• Friction force attracts objects towards each other

• Friction force has no effect on the movement of objects

• Friction force opposes the movement of objects by creating resistance.

• Friction force accelerates the movement of objects

Which force acts on an object when it is in contact with a surface?

• Friction force

• Normal force

• Magnetic force

• Gravitational force

What is the role of air resistance in the motion of objects?

• Air resistance slows down the motion of objects by exerting a force opposite to the direction of motion.

• Air resistance increases the speed of objects by pushing them forward.

• Air resistance causes objects to move in a straight line.

• Air resistance has no effect on the motion of objects.

Differentiate between contact and non-contact forces.

• Contact forces require physical contact, while non-contact forces can act over a distance.

• Contact forces do not involve physical touch.

• Contact forces are stronger than non-contact forces.

• Non-contact forces only occur in a vacuum.

How does gravity force impact the weight of an object?

• Gravity force impacts the weight of an object by pulling it towards the center of the Earth.

• Gravity force impacts the weight of an object by increasing its volume.

• Gravity force impacts the weight of an object by changing its color.

• Gravity force impacts the weight of an object by pushing it away from the center of the Earth.

Give an example of a situation where normal force is at play.

• A ball rolling down a hill

• A book resting on a table.

• A car accelerating on a highway

• A bird flying in the sky

Identify a force that can act on an object without direct contact.

• Pressure

• Friction

• Magnetism

• Gravity