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29 Cards in this Set
- Front
- Back
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a driver in a car passes a jogger running on a sidewalk. Relative to the jogger, the car is traveling 15 m/s. What is the reference point?
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the sidewalk
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Which of the following is an example of balanced force
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a kid running down a path
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which of the following results in a helpful increase of friction?
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sand applied to an icy sidewalk
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which of the following are 2 factors that determine speed
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distance and time
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Which of the following choices best represents force
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a push or a pull acting on an object
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a windmill is moving in a constantly circular path at 25 m/sec.
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it velocity is not changing
its acceleration is not changing there s a force net of 0N on it NONE OF THE ABOVE **** |
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The SI base unit for weight is?
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Newton
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What are the 2 factors that determine the amount of friction
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the force and the roughness of a surface
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Which of the following is true?
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all matter has has; all mass is affected by gravity
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The force of gravity is:
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is directly related to the amount of mass of the objects
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As the distance between 2 objects increases, the force of gravity between them?
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decreases
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What is the net force on an object that has forces of 5 N North and 10 N South acting on it?
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5 N south
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The difference between speed and velocity is that:
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velocity has direction, while speed does not
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The law of the universal gravitational says that gravitational force is relative to:
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mass and distance
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At 1 point during a race, a runner ran at a speed of 10 m/s west. Four seconds later she was running at a speed of 16 m/s West. What was the runner's acceleration?
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2 m/s2 west
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Which graph shows constant speed?
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see
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The runner in the race with the fastest average speed is the one who covers:
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100 m in 9 s
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If supported by data gathered over a period of time, a hypothesis becomes a:
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theory
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the mass of a can of soda is approximately?
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400 g
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When I am going home from school, I have to slow down to cross the street
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my acceleration becomes negative
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it is easier to keep a toy car rolling that to start strolling bc kinetic friction is greater force than static friction
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false
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when following the scientific method, it is possible to go back to the hypothesis step after testing the hypothesis
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true
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"I think the car will go faster if I make the slope steeper" is an example of a hypothesis
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true
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you are on a boat on the river. The speedometer of the boat says you are traveling at 40 km/hr but you are passing cars on the road parallel to the river (speed limit 50 km/hr). You conclude that you must be traveling downstream, not upstream.
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true
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The changeable factor in an experiment is called the control
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false
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My cat weighs 16 pounds on earth. On the Moon he would weigh less vc the force of the gravity is weaker on the moon than on earth.
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true
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To find the net force on an object you need to take a combination of all the forces acting on the object.
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true
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an unbalanced force can cause an objects motion to change by changing direction or by changing speed
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true
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According to the Universal low of gravitation, the reason why the moon has less gravity that the earth is that it has less mass than the earth.
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true
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