NCFE Physical Science Practice

Front

What is Newton's Second Law of Motion?

Back

Newton's Second Law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It can be expressed with the formula F = ma, where F is force, m is mass, and a is acceleration.

Front

Define kinetic energy.

Back

Kinetic energy is the energy that an object possesses due to its motion. It is calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

Front

What is momentum?

Back

Momentum is the quantity of motion an object has, which is the product of its mass and velocity. It is calculated using the formula p = mv, where p is momentum, m is mass, and v is velocity.

Front

How is power defined in physics?

Back

Power is the rate at which work is done or energy is transferred over time. It is calculated using the formula P = W/t, where P is power, W is work, and t is time.

Front

What happens to momentum in a closed system during a collision?

Back

In a closed system, the total momentum before the collision is equal to the total momentum after the collision, according to the law of conservation of momentum.

Front

What is the formula for calculating work done?

Back

Work done is calculated using the formula W = Fd, where W is work, F is force, and d is the distance over which the force is applied.

Front

Explain the concept of gravitational acceleration.

Back

Gravitational acceleration is the acceleration of an object due to the force of gravity. Near the Earth's surface, it is approximately 9.8 m/s².

Front

What is the relationship between mass and weight?

Back

Weight is the force exerted by gravity on an object and is calculated using the formula W = mg, where W is weight, m is mass, and g is the acceleration due to gravity.

Front

Define the term 'force'.

Back

Force is a push or pull acting upon an object, resulting from its interaction with another object. It is measured in Newtons (N).

Front

What is the difference between elastic and inelastic collisions?

Back

In elastic collisions, both momentum and kinetic energy are conserved. In inelastic collisions, momentum is conserved, but kinetic energy is not.