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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
  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.
What causes a falling sky diver to slow down after the parachute opens?
  1. gravity
  2. friction
  3. air resistance
  4. the ground
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
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?
  1. -96 s
  2. -6 s
  3. -6 m
  4. 6 s
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
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
Acceleration refers to                   .
  1. increasing speed
  2. decreasing speed
  3. changing direction
  4. 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 80 km 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]?

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