# Laws of Motion (Grade 8)

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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

- 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.

2.

What causes a falling sky diver to slow down after the parachute opens?

- gravity
- friction
- air resistance
- the ground

3.

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

4.

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

5.

Motion can be described by distance, speed, displacement, and velocity, where and also include direction.

- speed, velocity
- distance, displacement
- speed, displacement
- displacement, velocity

6.

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

7.

Acceleration refers to

- increasing speed
- decreasing speed
- changing direction
- 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 [math]m/s^2[/math]?

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