Newton’s first law of motion states than an object’s motion will not change unless O the net force acting on it is greater than zero.
O a force continues to be applied to the object.
O its inertia is stronger than the applied force.
O the object has no inertia.
20. Overcoming an object’s inertia always requires a(n)
O large mass.
O massive force.
O unbalanced force.
O two of the above
21. It is more difficult to start a 50-kg box sliding across the floor than a 5-kg box because the 50-kg box has greater
O mass.
O inertia.
O volume.
O velocity.
22. An object’s velocity will not change unless it is acted on by a(n)
O net force.
O strong force.
O unbalanced force.
O opposite but equal force.
23. Which force slows a skateboard when a skateboarder puts a foot down to brake?
O motion
O gravity
O friction
O inertia
24. If two arm wrestlers exert a force on each other’s hands, and the hands don’t move, the forces must be .
O balanced
O unbalanced
O weak
O strong
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25. The first law of motion says that an object at rest will remain at rest unless …
O it continues in a straight line
O a nearby star acts on it
O an outside force acts on it
O it is placed on a flat surface
26. According to the third law of motion, for every action there is ….
O a force sending it backward
O an equal and opposite reaction
O a greater force pushing on it
O a movement in all directions.
27. If one car moves ahead of another car that is traveling in the same direction, do the cars have the same velocity?
O No, they are traveling in different directions.
O Yes, they are traveling in the same direction.
O No, the cars are traveling at different speeds.
O Yes, the direction and speed of the cars is the same.
28. Do two skaters traveling in different directions at the same speed have the same velocity?
O No, because the direction is different
O No, because the skaters are different
O Yes, because the speed is the same
O Yes, because the acceleration is the same
29. A pull or push that acts on an object is called a(n)
O force
O acceleration
O speed
O gravity
30. is the pull that all objects exert on each other.
O Resistance
O Friction
O Inertia
O Gravity