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science
Unit 1
Question | Answer |
---|---|
which of the following are two factors that determine speed? | distance and time |
when the net forces equal to 0 N, they are which of the following? | Balanced |
which pf the following always causes change in speed, direction, or both? | unbalanced forces |
what is a force that opposes motion between two surfaces that are in contact? | friction |
which are the two factors that determine the amount of friction? | the force an the roughness of the surface |
which of these is an example of kinetic friction | a box sliding on a floor |
which of these is an example of static frication | a worker pushing a non-moving box |
in which of the following activities frication helpful | car tired moving forard |
in which of the following is frication harmful | car engine parts wearing out |
what is the net force on an object when you combine a force of 10 N north with a force of 5 N south? | 5 N north |
dividing the distance traveled b the total time is how to calculate | average speed |
the difference between speed and velocity is that | velocity has direction, while speed does not |
when a mover puts furniture in wheels, which type of friction is the mover using to make the job easier? | rolling kinetic friction |
A hiker's velocity begins at 1.8 m/s uphill and changes to 1.5 m/s uphill. How do you know that the hiker has a negative acceleration? | the speed decreased |
In which of the following is a skater NOT accelerating? | going strait in a constant speed |
An unbalanced force can cause an object's motion to change by? | changing direction or speed, start or stopping motion |
What would you call a building if you compared it with a moving student? | a referance piont |
What is the SI unit for speed? | m/s |
What is a way to reduce friction? | wax skies before skiing down a slope |
which of the following is an example of balanced force? | a porch swing hanging from the porch roof |