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Laws of Motion

1.
A magician suddenly jerks a tablecloth out from under the dishes on a table. This best demonstrates
1. an action-reaction pair of forces.
2. that the dishes have inertia.
3. that gravity tends to hold the dishes securely.
4. that the dishes have no acceleration.
2.
What causes a falling sky diver to slow down after the parachute opens?
1. gravity
2. friction
3. air resistance
4. the ground
3.
What is the speed of a car that travels 200 meters in 25 seconds?
1. 5000 m/s
2. 8 m/s
3. 0.8 m/s
4. 0.125 m/s
4.
If an object is moving with a velocity of $24 m/s$ and has an acceleration of $-4 m/s^2$, how long will it take it to stop?
1. -96 s
2. -6 s
3. -6 m
4. 6 s
5.
Motion can be described by distance, speed, displacement, and velocity, where                        and                        also include direction.
1. speed, velocity
2. distance, displacement
3. speed, displacement
4. displacement, velocity
6.
A car accelerates from 15 m/s to 30 m/s in 3.0 s. What is the car's acceleration?
1. 10 m/s/s
2. 25 m/s/s
3. 15 m/s/s
4. 5.0 m/s/s
7.
Acceleration refers to                   .
1. increasing speed
2. decreasing speed
3. changing direction
4. all of the above
8.
An object traveling 20 m/s accelerates 5 m/s/s for 12 seconds. What is its final velocity?

9.
A car travels 110 km North, turns around and then travels another 80 km South. The final displacement of the car is                 .
10.
How much force does an object with a mass of 100 kg need to accelerate at 18 $m/s^2$?

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