ACA G 12 Date: Physics Ms. Amal Dayshoum Name: ....... Forces Mark: /12 "Multiple choice: 1. Newton's First Law says that "Objects in motion stay in motion and objects at rest stay at rest unless..." [1 mark] A. acted on by an unbalanced force. C. gravity happens. B. nothing else happens. D. acted on by a balanced force. 2. Which one is an example of a field force? [1 mark] A. The force of a man puling on his dog through a rope. B. The force exerted by the earth on an apple falling from a tree. C. The force of a car on a cement barrier. D. The force of a soccer player kicking a ball. 3. What unit do we measure force in? [1 mark] A. Joules C. Kilograms B. Newtons D. Force 4. What is inertia? [1 mark] A. The movement of dark matter in space. The bouncing off of objects. B. The movement of gas in the atmosphere. The resistance to change in motion. 11. Short answers: 1. What is the net force for an object moving at a constant velocity? [1 mark] 2. You and your dad are moving the couch from one side to another. Your dad pushes with a force of 35 N to the right and you push with a force of 25 N right. What is the net force on the couch? [1 mark] 3. A net force of 80N is acting on an object at 30"from east. Calculate its x and y components. [2 mark] 4. The adjacent diagram shows the forces acting on an object. Find the magnitude and direction of the net force. (Do the 4 steps). [4 mark] Fs= 110N F2 = 80 N ......5.. ........... ...... ................m.... ..... F4=10ON