Newton's Laws of Motion

Front

Which statement describes the meteor's motion?
Options:
Its velocity was 7.8 km/s northward.
Its acceleration was 468 km/s².
Its speed was 468 km/s northward.
Its acceleration was 7.8 km/s².

Back

Its velocity was 7.8 km/s northward.

Front

A student graphed the position of a cart during a 7-second time interval. Which statement best describes the cart?

Back

The cart moved at a constant velocity of 0.5 m/s for the entire 7 seconds.

Front

Which of the following best describes the velocity of an object? 30 m/s, 30 m east, 30 m/s east, 30 m/s²

Back

30 m/s east

Front

What is the difference between the velocity and the speed of an object?

Back

Velocity has a direction associated with it, while speed has no specific direction.

Front

The three vehicles are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity. The pickup truck has a changing velocity because the pickup truck -

Back

is traveling on a curve in the road

Front

The picture shows an aerialist walking on a tightrope and holding a balancing bar. An action-reaction pair of forces exists between -

Back

the aerialist's feet and the rope

Front

Four boxes are sliding with constant speed before each box experiences an unbalanced force of 8 N. Which box would experience the greatest acceleration when the unbalanced force is applied? Options: The box with a mass of 2 kg, The box with a mass of 4 kg, The box with a mass of 6 kg, The box with a mass of 8 kg

Back

The box with a mass of 2 kg

Front

The unusual strength of a glue makes it able to hold a heavy object, or load, as shown in the diagram below. If the load exerts a strong downward force, the glue -

Back

exerts an upward force that is equal to the downward force

Front

Two forces applied to a 17 kg box, as shown. The box is on a smooth surface. Which statement best describes the acceleration of the box?

Back

The box accelerates at 1.0 m/s² to the right because the net force is 17 N to the right.

Front

The list includes six situations. Which objects in the list experience an unbalanced force? Options: The book, the ball, and the car; The ball, the car, and the bird; The can, the swing, and the bird; The book, the ball, the can, and the swing

Back

The can, the swing, and the bird