Introduction to Forces 6.7A

What is normal force?

• The force that pulls objects towards the center of the Earth.

• The support force exerted upon an object that is in contact with another stable object, acting perpendicular to the surface.

• The force that opposes the motion of an object in a fluid.

• The force that acts parallel to the surface of contact.

What is the effect of distance on gravitational force?

• As the distance between two objects increases, the gravitational force between them decreases.

• Gravitational force remains constant regardless of distance.

• As distance increases, gravitational force increases.

• Gravitational force is only affected by the mass of the objects.

What is the role of gravity in juggling?

• Gravity has no effect on juggling.

• Gravity pulls the juggling balls downwards, and the juggler must apply force to counteract this.

• Gravity helps to keep the juggling balls in the air.

• Gravity only affects the speed of the juggling balls.

What is friction?

• A force that accelerates an object in motion.

• A force that opposes the motion of an object, caused by the contact between two surfaces.

• A type of energy that increases with speed.

• A force that only acts on stationary objects.

What is the difference between gravitational force and normal force?

• Gravitational force pushes objects away from each other, while normal force pulls objects towards a surface.

• Gravitational force pulls objects towards each other, while normal force acts perpendicular to a surface to support an object resting on it.

• Gravitational force is stronger than normal force in all situations, while normal force only exists in a vacuum.

• Gravitational force is a contact force, while normal force is a non-contact force.

What happens to the normal force when you push harder against a surface?

• The normal force decreases.

• The normal force remains the same.

• The normal force increases when you push harder against a surface.

• The normal force becomes zero.

What happens to the force of gravity if two objects have the same mass?

• The gravitational force increases with distance.

• The gravitational force decreases with distance.

• The gravitational force between them is the same regardless of their distance.

• The gravitational force becomes zero.

What type of force does a juggler apply to keep the balls in the air?

• Gravitational force

• Frictional force

• Applied force

• Normal force

Which surface would create the least friction for sliding?

• Socks

• Bare feet

• Running shoes

• Carpet

What is gravity?

• A force that repels two bodies away from each other.

• A force that attracts two bodies towards each other, depending on their masses and the distance between them.

• A type of energy that can be harnessed for power.

• A phenomenon that only occurs on Earth.