Amber hikes 10 miles East then 5 miles West. The trip takes her 5 hours. What is her displacement?
5 miles East
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monster
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rocket
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gift
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Amber hikes 10 miles East then 5 miles West. The trip takes her 5 hours. What is her speed?
3 miles per hour
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15
What is inertia?
resistance to change in motion
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15
Why is the front of a car designed to crumple during a crash?
It increases the amount of time it takes for the crash to happen, which decreases the acceleration, which decreases the amount of force from the impact.
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15
TRUE or FALSE: In a collision between A and B, increasing the mass of A will always increase the acceleration of B.
FALSE: It will increase the FORCE between the two objects, but will not directly affect the acceleration. The acceleration in a collision is dependent on FORCE
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15
A golfer uses his club to hit his ball across the green. Why does the ball accelerate away from the club more than the club moves away from the ball?
The ball has less mass, so the same amount of force that is applied to both causes the ball to move farther.
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shark
Other team loses 10 points!
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A hovercraft uses blowers to force air underneath it, allowing it to coast on a thin layer of air. What type of force is it reducing?
Friction
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15
What is the net force on the box in the picture?
100 N to the right
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TRUE or FALSE: When a baseball is hit by a baseball bat, they exert equal and opposite forces on one another, which cancel each other out for a net force of 0.
FALSE: The forces are exerted on two different objects, so although there are equal and opposite forces applied, the effects do not cancel each other out.
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15
What type of motion does line B represent - an object moving at a constant speed, and object at rest, or an object moving at an increasing speed?
an object moving at a constant speed
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15
You use a ping pong ball to knock your friends water bottle off their desk. The water bottle falls backward, but the ping pong ball also bounces back towards you. Why does this happen?
Newton's 3rd Law: The ping pong ball exerted a force on the water bottle, but the water bottle exerted a force back on the ping pong ball, pushing it back.
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15
TRUE or FALSE: When two objects with different masses collide, only the larger object exerts a force on the smaller one, causing it to move.
FALSE - both objects exert equal and opposite forces on each other
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15
A frog jumps off of a lily pad, which is in the water, onto a rock. Which will move - the lily pad, the rock, or both, and in which direction?
