Front

What is gravity?

Back

Gravity is a force that attracts two bodies towards each other, commonly experienced as the force that pulls objects towards the Earth.

Front

What causes a ball to roll down a hill?

Back

Gravity causes the ball to roll down the hill.

Front

What force causes a ball to slow down and stop after rolling down a hill?

Back

Frictional force causes the ball to slow down and stop.

Front

What are contact forces?

Back

Contact forces are forces that act upon two objects that are in physical contact with each other.

Front

Which of the following is NOT a contact force: pushing an object, the weight of a pen on a table, kicking a soccer ball, or dropping a marble?

Back

Dropping a marble from the roof is NOT a contact force.

Front

What is friction?

Back

Friction is a force that opposes the motion of an object when it is in contact with another object.

Front

What is a force?

Back

A force is a push or a pull applied to an object.

Front

What is the unit of force?

Back

The unit of force is Newtons (N).

Front

What is the difference between contact and non-contact forces?

Back

Contact forces require physical contact between objects, while non-contact forces act at a distance without physical contact.

Front

What is an example of a non-contact force?

Back

Gravity is an example of a non-contact force.