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Physical Science Semester 2 Unit 8 Exam
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True or False: Force and Acceleration are NOT vectors.
False.
True or False: Velocity is a vector.
True.
A 2 kg rabbit starts from rest and is moving at 6 m/s after 3 seconds. What force must the rabbit exert to make this change in speed? (hint: use the velocity formula to find acceleration first, then use the force formula to solve for force)
F= 4 N
A car is driving down the road with a constant velocity. What can you say about the acceleration of the car? What can you say about the net force acting on the car?
a = 0m/s^2, F = 0 N
What are the units for acceleration?
m/s^2
What are the units for velocity?
m/s
What are the units for mass?
kg
An object has an initial velocity of 13 m/s and a final velocity of 20 m/s. The object's acceleration is 3 m/s^2. How long is the object traveling for?
t =2.33 s
An object has an final velocity of 55 m/s and a constant acceleration of 3 m/s^2 in the same direction. What will the object's velocity be at t = 10 s?
Vi = 25 m/s
An object has an initial velocity of 3 m/s and a constant acceleration of 2 m/s^2 in the same direction. What will the object's velocity be at t =6 s?
Vf = 15 m/s
A large textbook is pushed across the desk in your classroom. What forces are acting on this textbook? Draw a Free Body Diagram showing the forces.
Upward force = FN (normal force), Downward force = Fg (force of gravity), Right force = Fapp (applied force), Left force= Ff (force of friction)
What are the units for force?
N (newtons) or kg x m/2^2
What are the units for time?
s (seconds)
What formula involves final velocity and initial velocity?
Vf = Vi + at
An object has an acceleration of 4 m/s^2 and a mass of 25 kg. Calculate the force acting on the object.
F = 100N
An object has an acceleration of 3 m/s^2 and a mass of 15 kg. Calculate the force acting on the object.
F = 45 N
What is the formula for force?
F =ma
True or False: The units for velocity are m/s^2 and the units for acceleration are m/s.
False. The units for velocity are m/s. And the units for acceleration are m/s^2
True or False: Velocity and Acceleration are BOTH vectors.
True. Acceleration is derived from velocity.
What has magnitude and direction?
Velocity and Acceleration
Is velocity a scalar or a vector?
velocity is a vector
Is speed a scalar or a vector?
speed is scalar
What do you use the pythagorean theorem for in kinematics problems?
Displacement with vectors
What is the pythagorean theorem?
a^2 + b^2 = c^2
What is the formula for acceleration?
Acceleration = velocity/ time
What is the formula for velocity?
Velocity = displacement/ time
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