6.) What can friction do on a machine? a. wear out its parts
b. reduce efficiency
c. cause heat
d. all of these

7.) Friction acts ______.
a. opposite the direction of motion
b. parallel or in the same direction of motion
c. perpendicular to the surface
d. at an angle to the surface

8.) Which object would experience air friction?
a. ship
b. ball bearing
c. parachute
d. bicycle

9.) To start an object moving, the applied force must be ______ compared to starting friction.
a. equal
b. less
c. greater
d. much greater

10.) Which statement is correct?
a. Friction is a push
b. Friction is a pull
c. Friction is both a push and a pull
d. Friction has nothing to do with motion
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Yung matinong sagot sana pls​