Work Prelesson

Which of these is working:
1. A man climbing stairs
2. A man sitting down
Which of these is working harder?
1. A woman pushing hard on a car.
2. A woman pushing lightly on a feather.
To be doing work you have to be using
1. force
2. speed
3. mass
4. acceleration
When pushing on an object you do work if:
1. The object moves
2. The object stays at rest
3. The object pushes back
So, we know now that to be doing work there has to be a force and it has to be moving.
Which of the following is more work?
1. Pushing a heavy car
2. Pushing a light car
Which of the following is more work?
1. Pushing a car a long distance
2. Pushing a car a short distance
So, more work is done if more force is used and for a longer distance.
What, then, is the equation for work?
1. W = Fd
2. W = F/d
3. W = F + d
4. W = F - d
If W = Fd, what does that mean?
1. Work equals force times distance.
2. Work equals force divided by distance.
3. Work equals force plus time.
4. Work equals force minus time.
When we say something is working (like a clock) we mean:
1. It has enough energy to function
2. It has a job to perform
3. It is using time while functioning
When we say something is "working" we mean it has energy to be able to work. So which of the following is true:
1. Work and energy are related.
2. Work and energy are words that we use incorrectly, because they are not related.
We call work "applied energy". This means:
1. Work uses energy
2. Work lowers energy.
3. Work doesn't need energy.
Energy and work have the same units which are:
1. Joules
2. watts
3. power
4. newtons