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Newton's laws, force

Chs. 5 & 6

QuestionAnswer
What do you need to know to calculate an object's acceleration? Final velocity, starting velocity, and time it takes to change velocity
Two forces act on an object. One force has a magnitude 10N and is directed North, the other has a magnitude of 5N and is directed South. What is the net force? 5 N north
What is the formula to determine speed? distance/time
In 2.5 h you walk 9 km. When you divide 9km by 2.5 h what are you calculating? speed
You are in Chicago, IL. You decide to head south to Austin, TX. In one hour, you travel 50 km. What is your velocity? 50km/h south
What is acceleration? Change in velocity, speed, or direction
What is a force that opposes motion between two surfaces that are touching? friction
When does an object's velocity remain constant? speed and direction do not change
moving faster, slowing down, and curving away are all examples of what? change in in acceleration
If you slow down as you ride a bike up a hill, what do you experience? acceleration, deceleration, and negative acceleration
What is your acceleration if you walk 1000m at a constant speed of 10 m/s? there is no acceleration
A 5kg object has less inertia than a ________ object (4 kg, 6000 g, 2 kg, 1500 g) 6000 g
Think of Newton's 3rd law- if you are holding a 20 N lead weight motionless in your hand, what must be true? Your hand exerts an upward force of 20 N
What is the acceleration of a 9 kg mass if a force of 90 N acts on it? 10 m/s/s
What force is necessary to accelerate a 1500 kg car at a rate of 50 m/s/s? 75000 N
What is the mass of an object if a force of 75 N accelerates an object 5 m/s/s? 15 kg
What is Newton's 3rd law of motion? Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.
If a car driver suddenly makes a sharp turn, the passenger slides to the side of the car because of what? inertia
Why do you tend to fall backward when an airplane takes off? Gravity
What is momentum? Mass X Velocity
Created by: sjhague
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