Working Hard or Hardly Working

Front

What is the scientific definition of work?

Back

Work is defined as the transfer of energy that occurs when a force is applied to an object and the object moves in the direction of the force.

Front

What is the formula for calculating work?

Back

W = F × d, where W is work, F is the force applied, and d is the distance moved in the direction of the force.

Front

What are the units of work?

Back

The unit of work is the Joule (J), which is equivalent to a Newton (N) times a meter (m).

Front

If a force of 10 N moves an object 5 m, how much work is done?

Back

W = F × d = 10 N × 5 m = 50 J.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in energy of that object.

Front

How does gravitational force affect work done in lifting an object?

Back

The work done in lifting an object is equal to the gravitational force acting on it multiplied by the height it is lifted.

Front

Calculate the work done in lifting a 5 kg object to a height of 2 m (g = 10 N/kg).

Back

W = m × g × h = 5 kg × 10 N/kg × 2 m = 100 J.

Front

What is the average force exerted if 240,000 J of work is done over a distance of 40 m?

Back

F = W / d = 240,000 J / 40 m = 6000 N.

Front

True or False: The force of friction does work when it acts on an object.

Back

True, the force of friction can do work by opposing the motion of an object.

Front

What is the significance of the direction of force in calculating work?

Back

Work is only done when the force applied causes displacement in the direction of the force.