NEED HELP!!! IF YOU ANSWER ALL QUESTIONS I WILL GIVE YOU BRAINEST!!!!! 15 POINTS!!!!

1. Using Newton’s first law of physics, which explains why it is harder to swim in water with a current (like the ocean) than in contained water (like a pool)?
A.
Perpetual motion can only be interrupted by an unbalanced force.
B.
The current will interfere with perpetual motion more than still water.
C.
It takes much more strength to swim if there is a current than in a pool.
D.
Still water is an immovable object, but currents have their own momentum.

2. Why is Leonardo DaVinci’s work important for those interested in body mechanics?
A.
He identified the relationship between force and momentum.
B.
He was the first to apply principles of mechanics to machines.
C.
He was one of the first to study the mechanics of the body in motion.
D.
He was a talented athlete who wanted to use mechanics to increase speed.

3. Based on Newton’s third law of motion, will a tennis ball go farther if it hits a tennis racquet that is still or one that is in motion?
A.
One that is still because it will absorb all of the force of the ball.
B.
One that is still because that will have a greater impact on the trajectory.
C.
One that is in motion because both the ball and the racquet will contribute momentum.
D.
One that is in motion because the racquet’s force will cancel the ball’s force out.

4. When you learn to lift weights with the proper body mechanics, good form becomes a habit.
A.
True

B.
False

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