Weight and weightlessness
Answers are for parents and teachers.
1
An 80 kg person is in a lift accelerating up at a = 1 m/s². What is the weight (N)? (g = 10 m/s²)
880
2
The same person is in a lift accelerating down at a = 1 m/s². What is the weight (N)?
720
3
A lift moves down with a = 2.5 m/s². By what factor does weight decrease? (g = 10 m/s²; give a fraction)
4/3
4
A car (m = 800 kg) passes the top of a convex bridge at 10 m/s, R = 50 m. What is P (N)? (g = 10 m/s²)
6400
5
Why does an astronaut in orbit float? Explain briefly.
The astronaut and the craft fall freely together (a = g); there is no support reaction, so the weight is zero.