Laws of Motion (Grade 8)
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Laws of Motion
A magician suddenly jerks a tablecloth out from under the dishes on a table. This best demonstrates
- an action-reaction pair of forces.
- that the dishes have inertia.
- that gravity tends to hold the dishes securely.
- that the dishes have no acceleration.
What causes a falling sky diver to slow down after the parachute opens?
- air resistance
- the ground
What is the speed of a car that travels 200 meters in 25 seconds?
- 5000 m/s
- 8 m/s
- 0.8 m/s
- 0.125 m/s
If an object is moving with a velocity of [math]24 m/s[/math] and has an acceleration of [math]-4 m/s^2[/math], how long will it take it to stop?
- -96 s
- -6 s
- -6 m
- 6 s
Motion can be described by distance, speed, displacement, and velocity, where and also include direction.
- speed, velocity
- distance, displacement
- speed, displacement
- displacement, velocity
A car accelerates from 15 m/s to 30 m/s in 3.0 s. What is the car's acceleration?
- 10 m/s/s
- 25 m/s/s
- 15 m/s/s
- 5.0 m/s/s
Acceleration refers to
- increasing speed
- decreasing speed
- changing direction
- all of the above
An object traveling 20 m/s accelerates 5 m/s/s for 12 seconds. What is its final velocity?
A car travels 110 km North, turns around and then travels another 80km South. The final displacement of the car is
How much force does an object with a mass of 100 kg need to accelerate at 18 [math]m/s^2[/math]?