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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

Answer 1 – 10

• D. a porch swing hanging from the roof

Question 1 - 20

• When the net forces equal 0 N, they are considered ___________ forces

Answer 1 – 20

• Balanced

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

Answer 1 – 30

• B. Unbalanced forces

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

Answer 1 – 40

• D. 5N North

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

Answer 1 – 50

• B. unbalanced force

Question 2 - 10

• Define friction

Answer 2 – 10

• The force that opposes motion between two surfaces that are touching.

Question 2 - 20

• When I roll a cart across the floor, the force that opposes the motion is called _______________ friction

Answer 2 – 20

• Kinetic

Question 2 - 30

• If I push on a car and the car doesn’t move, this is an example of ___________ friction.

Answer 2 – 30

• static

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

Answer 2 – 40

• B. Friction between car tires and the road that moves the car forward

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

Answer 2 – 50

• B. oil added to a car engine

Question 3 - 10

• Your mass on the moon would

Answer 3 – 10

• Be the same

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

Answer 3 – 20

• C) both are attracted to each other

Question 3 - 30

• Do all objects have gravitational force? Explain why or why not

Answer 3 – 30

• Yes but due to the objects’ masses, one may have less gravitational pull than the other.

Question 3 - 40

• Does your weight change from place to place (explain why or why not)

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

Question 3 - 50

• Name the two factors that effect gravitational pull.

Answer 3 – 50

• Distance from the object and the masses of the objects

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

Answer 4 – 10

• C. a box sliding on a floor

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

Answer 4 – 20

•C. A working pushing on a box that is too heavy to move

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

Answer 4 – 30

• A. greater masses

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

Answer 4 – 40

• C. Rolling Kinetic Friction

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.

Answer 4 – 50

• D. is directly related to the amount of mass of the objects.

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

Answer 5 – 10

• A. decreases

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

Answer 5 – 20

• C. distance and time

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

Answer 5 – 30

• C. the path on which the jogger is jogging

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

Answer 5 – 40

• A. the hands of a clock relative to the numbers on a clock

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

Answer 5 – 50

• B. going straight at a constant speed