When you peel some sticky tape from a roll it often tries to go back on again. Explain, as fully as you can, why it does this.

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Using a wheel and axle, a farmer is trying to lift a bucket of water from the bottom of a well. the larger wheel has a radius of 40 cm compared to the axle that has a radius of 10 cm. if a bucket of water is 50 n, then how much effort is required to raise it? 12.5 n 200 n 2 n 500 n