There will be a pop quiz tomorrow on 4.1 and 4.2 (main concepts are mass, weight, work and energy). Review your notes and worksheets!
Here are some additional practice questions:
1. Determine the force of gravity acting on a 16.5-kg object on Earth's surface.
2. Provide a scenario in which the object in #1 would 'lose' its weight but not its mass. Explain how the weight is reduced in your scenario.
3. Determine the amount of work down by a car engine if it exerts a force of 1000N to move the car a distance of 0.8 km.
4. A backpack was lifted from the floor to be placed on the top shelf of a student's locker. The height of the shelf is 1.6 m. The backpack itself is 0.6 kg and contains 4 heavy textbooks - each with a mass of 1.75 kg. Determine the amount of energy required to move the backpack onto the shelf.
