Unit 6 Test Review: Force and Motion (Net Force, PE/KE, Inclined Planes)

1. Please watch this video for some info about forces. Calculating Balanced and Unbalanced Forces What is a force 2. When two or more forces are acting on the same object, in the SAME direction, you ADD the forces. The unit of force is a Newton (N).25 N + 20 N = 5 N left 45 N right 10 N right 45 N left 3. When two forces are acting on the same object in OPPOSITE directions, you subtract the forces.12 N - 10 N = 22 N 12 N 2 N 4. When forces are BALANCED, the net force is zero (0) To the right To the left 5. A big tractor pulls a box with a force of 400N to the left. A small tractor pulls that same box with a force of 200N to the right. What is the net force on the box and what direction will it move? net force is 600 Nthe box will not move net force is 200 Nthe box will move to the right net force is 200 Nthe box will move to the left. net force is 600 Nthe box will move to the left 6. In the diagram 2 people are pushing books. What is the net force being applied to the books? 25 N 5 N to the right 5 N to the left zero, the forces are balanced 9. The boy in the picture is trying to pull a dog on its leash, but the boy and the dog are moving in the same direction. Which of the following best describes this situation? The forces are balanced, and the net force is zero. The forces are unbalanced, and the boys force is greater. The forces are unbalanced, and the dog's force is greater. The forces are balanced, and the dog is stronger than the boy. 10. What is the net force? 15 N 5 N to the left 5 N to the right 15 N left 11. What is the net force? 19 N to the right 4 N to the left 7 N to the right 3 N to the right 12. What is the net force? 25 N 10 N down 5 N up 10 N up 13. These boys are both pulling with 10 N of force. What will happen? The boy in blue will win due to unbalanced forces. They will not move at all due to balanced forces. The boy in red will win due to unbalanced forces. They will not move at all due to unbalanced forces. Match the terms on the right with an example from the left. potential energy resting energy (ie. at the top of the first hill on roller coaster) kinetic energy energy of motion (ie. maximum at the bottom of the first hill in roller coaster) friction thermal energy (friction) that causes a decrease in roller coaster's kinetic energy gravity attractive force that pulls objects towards Earth (ie higher objects have more PE due to gravity) Which object would have the most kinetic energy? slow car walking cat gliding bird speeding plane Why must the first hill be the tallest in a roller coaster? Kinetic Energy is due to later hills and loops Potential energy of first hill must be sufficient or ride will get stuck If the first hill is the tallest, the ride will always crash The first hill's height is not important Find the terms listed below. Click on the first and last letter of each word to highlight it. To mark a word click its first letter then click its last. UNBALANCED POTENTIAL SUBTRACT BALANCED FRICTION GRAVITY FORCE RAMP ADD Match the terms on the right with an example from the left. Force A push or pull that makes something move or to be put into motion Motion Changing location or moving from one place to another Friction The force that is created when two objects rub against each other as they move past each other Gravity A force that pulls one object towards the center of another object Newton's 1st Law When an object is in motion it tends to stay in motion until acted on by an outside force Newton's 2nd Law Force equals mass multiplied by acceleration Newton's 3rd Law For every action, there is an opposite and equal reaction Fill in the blanks for Newton's First Law.An object at rest stays at rest or an object that is in motion at a constant rate in a straight line keeps moving at that rate unless an outside force acts on it.Fill in the blanks for Newton's Second Law.The amount of force needed to make an object change its motion depends on the mass of the object and the amount of force required.Fill in the blanks for Newton's third law.For every action, there is an equal and opposite reaction.