# Physics

Note: the question with stars next to it is my choice.

(Image)
Car A. - mass: 10 kg, 8 m/s
Car B - mass: 10kg 2 m/s

1. The total momentum of the two cars before a collision is 100 kg m/s

A - 0 kg m/s
B - 50 kg m/s
C - 100 kg m/s
D - 200 kg m/s****

2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s?

A - 4.00 kg m/s
B - 20.0 kg m/s
C - 25.0 kg m/s
D - 100 kg m/s****

3. Which of the following describes the relationship between mass and inertia?

A - When there is more mass, there is less inertia.****
B - When there is less mass there is more inertia.
C - When there is more mass there is more inertia.
D. When there is no mass there is more inertia.

4. Jellyfish sometimes squeeze the sides of their bodies. This pushes a stream of water from the back end of their bodies. According to Newton's third law of motion, how will this behavior affect the movement of the Jellyfish?

A - The jellyfish will move forward.****
B - The inertia of the jellyfish will increase.
C - The jellyfish will move backward.
D - The jellyfish will stay still.

5. Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

A - a 71 kg lion running at 10 m/s
B - a 45 kg zebra running at 13 m/s
C - a 61 kg zebra running at 8.0 m/s
D a 61 kg zebra running at 8.0 m/s.****

6. According to Newton's third law of motion, if a rolling ball collides with a wall and exerts a force of 3 N on that wall, how much force does the wall exert back on the ball?

A - 0 N
B - 3 N****
C - 6 N
D - 9 N

7. After an avalanche, a huge block of stone slid down a mountain and landed in the middle of a road. People in the nearby town had a very difficult time moving it out of the road. The block of stone is difficult to move because...

A - it has a high amount of momentum.
B - has a balanced forces acting on it.
C - it has a high amount of inertia.
D - has an unbalanced forces acting on it.****

8. Which of the following statements is true about a collision between two cars in the absence of outside forces?

A - The total momentum after collision is the same as the total momentum before the collision.
B - The total momentum after the collision is greater than the total momentum before the collision.****
C - The total momentum after the collision is less than the total momentum before the collision.
D - The total momentum after the collision is zero.

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1. 1,3 wrong
5. what is the difference between c and d?
7. wrong
8. wrong

and get this in your mind: Mass is inertia. The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion.

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bobpursley
2. Thanks, mate.
We just started physics so I'm very new to this, it's interesting but quite difficult to understand at times.

Again, thanks!

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3. Oh, C and D I see. I typed the same thing twice. It was a mistake.

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4. 1.100 kg m/s
2.100 kg m/s
3.When there is more mass, there is more inertia
4.The jellyfish will move forward
5.a 61 kg zebra running at 8.0 m/s
6.3N
7.It has a high amount of inertia
8.The total momentum after the collision is the same momentum before the collision
You welcome :) -)_(-

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5. ... you are...

Keep going

i'm just buggin you

almost there

RIGHT BY 100 percent!

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6. XD i'm sorry

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7. i was basically looking at a blank peice of paper for a minute.

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8. and you are %100 correct

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2. 👎

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