A push or pull on an object. It makes an object move, stop, change directions, speed up or slow down.
Force
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If you want to put an object into motion, the forces on the object must be...
Balanced
Unbalanced
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An invisible force that pulls objects towards the Earth.
Gravity
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A force that opposes motion when two objects rub against each other.
Friction
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Objects with ________ surfaces have high friction.
rough
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Objects with ________ surfaces have low friciton.
smooth
rough
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True or False: More friction allows things to move more smoothy.
False
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What is the unit used to measure force?
Newtons
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What is the formula for finding the speed of an object?
Distance divided by time
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If an object is not moving, the forces must be....
Balanced
Unbalanced
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April and Jessica are playing tug of war. They are both pulling with 50 Newtons of force. Their forces would be ______________ and the rope ____________ move.
Unbalanced; would
Unbalanced; would not
Balanced; would
Balanced; would not
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If 2 people are pushing a box in opposite directions with the same amount of force, the box ___________ move.
will
will not
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If a ball is rolling across the sand at the beach, what will cause the ball to slow down and stop?
inertia
balanced forces
friction
gravity
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When there is no change in the speed of an object, (the speed is staying the same) we say the object is....