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Forces and Motion Review
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What is the orange arrow showing?
Friction force
Which of Newton's laws is this showing?
Newton's third law
If you let go of the magnets in this picture what would they do?
Repel
If you let go of the magnets in this picture what would they do?
Attract towards each other
If a skateboarder has a mass of 20 kg and a momentum of 40 kg m/s, what is the velocity of the skateboarder?
20 m/s
If a skateboarder has a mass of 20 kg and has a velocity of 10 m/s, what is their momentum?
200 kg m/s
In which direction does the force of friction work?
Opposite of motion
I push Brilliant Bob on a skateboard and he has a mass of 60 kg and is accelerating at 2 m/s^2. What is the force I used to push him?
120 N
If I push a 10 kg block with a force of 10 N, what is the acceleration of the block?
1 m/s^2 or m/s/s
What is Newton's 3rd law of motion?
For every action, there is an equal but opposite reaction.
What is Newton's 2nd law of motion?
F=m x a-The more mass, the more force you need to make it accelerate
What is Newton's 1st law of motion?
Intertia-An object in motion stays in motion and an object at rest stays at rest unless acted on by an unbalanced force.
Where around a magnet is the magnetic field the strongest?
The poles (ends)
A swimmer pushing off from the wall of pool exerts a force of 1 N on the wall. what is the reaction force of the wall on the swimmer?
1 N
What force causes an object in motion to remain in motion?
Inertia