Task 5: True and False /12 (a) T F Using a Force-versus-Position graph the work done is the area under the curve. (b) T F Work will be done if the force and displacement are in opposite directions (ie angle is 180). (c) T F Jeff can do twice as much work as Tom but takes twice as much time. Therefore Jeff has twice the power of Tom. (d) T F Karen moves a crate 5.00 cm horizontally across a desk using an applied force of 10.0 N. The work done is 50.0 N (e) T F If you double the velocity of a car you double the kinetic energy. (f) T F If you double the height of a balloon you double its gravitational energy. (g) T F An example of a non-conservative force is a magnetic force (h) T F An object can have a negative gravitational potential energy. (i) T F A Watt is equivalent to a jouleseconds. (j) T F A falling object at terminal velocity has a change in energy equal to zero. (k) T F The frictional force on a box as it slides to a stop is said to be doing negative work