Work and Power

Front

What is a force?

Back

A force is a push or pull acting on an object, which can cause it to accelerate, decelerate, or change direction. An example of a force is weight.

Front

What is the formula for work?

Back

Work is calculated using the formula: Work = Force x Distance.

Front

True or false: If an object does not move, no work is done on it.

Back

True. If the distance moved is zero, the work done is also zero.

Front

What is power in terms of work?

Back

Power is the rate at which work is done, calculated as Power = Work / Time.

Front

How do you calculate the work done when lifting an object?

Back

Work done (W) is calculated using the formula: W = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What unit is work measured in?

Back

Work is measured in joules (J).

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in energy. Energy can be transferred or transformed through work.

Front

If a 12-newton box is moved up a ramp, what information is needed to calculate power?

Back

To calculate power, you need to know how long the task took.

Front

What is the gravitational force acting on a 6.8 kg object?

Back

The gravitational force (weight) can be calculated using the formula: Weight = mass x gravity (approximately 9.81 m/s²). For 6.8 kg, it is about 66.7 N.

Front

What is the work done when lifting a 6.8 kg object to a height of 1.3 m?

Back

The work done is approximately 8.84 J, calculated using W = mgh.