2Question 1 What two things are needed to describe a vector. Direction and magnitudeRemember, force is a vector. Force has a direction (we show it with arrows), and the magnitude is the strength of the force (we measure it in Newtons. The larger the force, the longer the arrow).
3Question 2 Describe magnitude in two different ways. Size or measurement10 degrees50 yards20 m/s225 newtons (Force!)Magnitude is something you can masure.
4Question 3 Give two examples of units for a force. 200 newtons left 66 newtons south2 m/s2 southRecall force is a vector and all vectors need direction and magnitude
5Question 4Identify all of the types of forces acting as you sit in your chair.GravityNormalAppliedBalanced
6Question 5Identify all of the types of forces acting on another object that is moving.GravityNormalFrictionInertia - maybeIf the speed is constant and traveling in a straight line it is balanced.
7Question 6 What happens where forces are balanced? Net force is zero Motion doesn’t changeBut it can be moving, just at a constant speed and direction.Recall: velocity changes when an object speeds up, slows down or changes direction. If velocity changes, the forces are UNBALANCED. This is why forces are BALANCED at a constant speed.
8Question 7 Give two examples of balanced forces. Share out your examples.A car with cruise control on. (Constant speed).An object at rest.
9Question 8 What happens when forces are unbalanced. Net force is NOT zeroVelocity will change therefore acceleration is changing.Slowing downSpeeding upChanging direction
10Question 9 Give two examples of unbalanced forces. Share out your examples.
11Question 9 Give two examples of unbalanced forces. Share out your examples.One team wins a game of tug-o-warAny object that is changing velocity
12Question 10 Decrease mass Increase force For example, how can she increase acceleration?Reduce the amount of weights.Increase force by strengthening her musclesDescribe two ways to increase the magnitude of an object’s acceleration.
13Question 11All objects are pulled towards each other by gravity. The force of this pull is affected by the size of the two objects and/or the distance between them.Example (pg 97): Earth is large enough and close enough to exert force on us (Gravity pulls from Earth’s core).As Mass increases, Gravity increases (and vice versa)As distance increases, gravity decreses (and vice versa).Put the law of universal gravitation in your words and give an example.