Contact Forces Review

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion. It depends on the mass of the object and the square of its velocity, expressed as KE = 1/2 mv².

Front

How does mass affect kinetic energy?

Back

The greater the mass of an object, the more kinetic energy it has when moving at the same speed. For example, a 60 g ball will have more kinetic energy than a 6 g ball if both are rolling down a ramp.

Front

What is potential energy?

Back

Potential energy is the stored energy in an object due to its position or state. It can be converted into kinetic energy when the object is in motion.

Front

What is the relationship between potential energy and kinetic energy in a closed system?

Back

The amount of potential energy put into a system is equal to the amount of kinetic energy that will be in the system, assuming no energy is lost to friction or other forces.

Front

What is friction?

Back

Friction is a contact force that resists the motion of two surfaces that are pressed together. It acts in the opposite direction of the movement.

Front

What factors affect the amount of friction between two surfaces?

Back

The amount of friction depends on the types of surfaces in contact and the force pressing them together. Rough surfaces create more friction than smooth surfaces.

Front

What is the formula for calculating kinetic energy?

Back

The formula for kinetic energy (KE) is KE = 1/2 mv², where m is mass and v is velocity.

Front

What is the role of force in overcoming friction?

Back

A large amount of force is required to overcome friction and initiate or maintain motion between two surfaces.

Front

What is a contact force?

Back

A contact force is a force that acts at the point of contact between two objects, such as friction, tension, and normal force.

Front

What is gravitational potential energy?

Back

Gravitational potential energy is the energy an object possesses due to its height above the ground, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.