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Type Topic in here!. Question 1 - 10. Which is an example of a balanced force? A. a baby pushed in a stroller on the sidewalk B. a child running down a path C. A car traveling on the highway D. a porch swing hanging from the roof. Answer 1 – 10. D. a porch swing hanging from the roof. - PowerPoint PPT PresentationTRANSCRIPT
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Forces Friction Weight vs mass
Forces & frictionagain
Hodge podge
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Question 1 - 10
• Which is an example of a balanced force?• A. a baby pushed in a stroller on the sidewalk• B. a child running down a path• C. A car traveling on the highway• D. a porch swing hanging from the roof
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Answer 1 – 10
• D. a porch swing hanging from the roof
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Question 1 - 20
• When the net forces equal 0 N, they are considered ___________ forces
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Answer 1 – 20
• Balanced
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Question 1 - 30
• Which of the following always cause a change in speed, direction, or both?
• A. balanced forces • B. Unbalanced forces • C. Neither • D. Any combination of forces
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Answer 1 – 30
• B. Unbalanced forces
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Question 1 - 40
• Two forces act on an object. One force has a magnitude of 10 N and is directed toward the north. The other has a magnitude of 5N directed toward the south. The object experiences a net force of
• A. 5 N south • B. 15N north• C. 50N North• D. 5N North
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Answer 1 – 40
• D. 5N North
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Question 1 - 50
• To produce a change in motion a force must be a(n)
• A. balanced force• B. unbalanced force • C. frictional force • D. gravitational force
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Answer 1 – 50
• B. unbalanced force
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Question 2 - 10
• Define friction
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Answer 2 – 10
• The force that opposes motion between two surfaces that are touching.
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Question 2 - 20
• When I roll a cart across the floor, the force that opposes the motion is called _______________ friction
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Answer 2 – 20
• Kinetic
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Question 2 - 30
• If I push on a car and the car doesn’t move, this is an example of ___________ friction.
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Answer 2 – 30
• static
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Question 2 - 40
• Which is an example of friction that is helpful
a) Friction that causes engine parts to wear outb) Friction between car tires and the road that
moves the car forwardc) Friction that wears holes in your socksd) Wind causing soil erosion
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Answer 2 – 40
• B. Friction between car tires and the road that moves the car forward
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Question 2 - 50
• Which of the following is a helpful decrease in friction?
• A. Force applied while scrubbing• B. oil added to a car engine• C. sand applied to an icy road surface • D. deep tread added to snow tires
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Answer 2 – 50
• B. oil added to a car engine
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Question 3 - 10
• Your mass on the moon would
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Answer 3 – 10
• Be the same
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Question 3 - 20
• If a book falls of a desk, what is the attraction?• a) the book is attracted to the earth• B) the earth is attracted to the book because
of mass• C) both are attracted to each other
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Answer 3 – 20
• C) both are attracted to each other
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Question 3 - 30
• Do all objects have gravitational force? Explain why or why not
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Answer 3 – 30
• Yes but due to the objects’ masses, one may have less gravitational pull than the other.
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Question 3 - 40
• Does your weight change from place to place (explain why or why not)
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Answer 3 – 40
• Yes due to the mass of the objects (like the moon vs the earth) and how far you are from the center of the earth
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Question 3 - 50
• Name the two factors that effect gravitational pull.
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Answer 3 – 50
• Distance from the object and the masses of the objects
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Question 4 - 10
• Which of these is opposed by kinetic friction• A. a book sitting on a table • B. a cat standing in a yard• C. a box sliding on a floor • D. a child leaning on a building
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Answer 4 – 10
• C. a box sliding on a floor
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Question 4 - 20
• Which of these is opposed by static friction?• A. A toy car rolling on the floor • B. soil erosion• C. A working pushing on a box that is too
heavy to move • D. A dog running in the yard
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Answer 4 – 20
•C. A working pushing on a box that is too heavy to move
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Question 4 - 30
• The gravitational pull is greater between two objects that have
• A. greater masses• B. have rougher surfaces• C. are farther apart • D. are moving at a greater speed
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Answer 4 – 30
• A. greater masses
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Question 4 - 40
• When a mover puts furniture on a dolly with wheels, which type of friction is the mover using to make his job easier?
• A. Static • B. Sliding kinetic friction• C. Rolling Kinetic Friction• D. gravitational Friction
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Answer 4 – 40
• C. Rolling Kinetic Friction
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Question 4 - 50
• The force of Gravity • A. is not related to the amount of mass of the objects• B. is related to the amount of mass of the objects
unless the mass is too small• C. is related to the amount of mass of the objects but
only indirectly• D. is directly related to the amount of mass of the
objects.
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Answer 4 – 50
• D. is directly related to the amount of mass of the objects.
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Question 5 - 10
• As the distance between 2 objects increases, the force of gravity between them
• A. decreases• B. doesn’t change• Increases slightly• Increases greatly
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Answer 5 – 10
• A. decreases
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Question 5 - 20
• Which of the following are two factors that determine speed?
• A. acceleration and time• B. Velocity and time• C. distance and time• D. motion and time
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Answer 5 – 20
• C. distance and time
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Question 5 - 30
• A driver of an SUV drives past a jogger on the subdivision walking path. Relative to the jogger, the SUV is moving 15m/s. What is the reference point in this situation?
• A. the SUV• B. the jogger • C. the path on which the jogger is jogging • D. The road on which the the SUV is traveling
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Answer 5 – 30
• C. the path on which the jogger is jogging
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Question 5 - 40
• Which of the following most closely illustrates motion by relating it to a reference point ?
• A. the hands of a clock relative to the numbers on a clock
• B. the distance a race care traveled relative to the time of travel.
• C. the speed of a bike relative to the direction of travel
• D. the velocity change of a train relative to time
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Answer 5 – 40
• A. the hands of a clock relative to the numbers on a clock
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Question 5 - 50
• In which of the following is a skater not accelerating
• A. going straight while speeding up • B. going straight at a constant speed • C. making circles in a constant speed • D. going straight while slowing down
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Answer 5 – 50
• B. going straight at a constant speed