A massive truck and a small insect have a head-on collision. According to Newton’s Third Law, which of the following statements is correct regarding the forces of the impact?

The insect exerts a greater force on the truck because it undergoes a much larger acceleration.

No forces are exchanged because the mass of the insect is negligible compared to the truck.

The truck and the insect exert forces of equal magnitude on each other in opposite directions.

The truck exerts a greater force on the insect than the insect exerts on the truck.

Question

True or False: According to Newton's First Law, a spacecraft traveling at $1000\ \text{m s}^{-1}$ in deep space (where friction and gravity are negligible) will continue to move at that same speed and in the same direction forever without using its engines.

A small research rocket of mass $500\ \text{kg}$ is launched vertically. The rocket engine provides an upward thrust of $7400\ \text{N}$ . Taking $g = 9.8\ \text{m s}^{-2}$ , what is the upward acceleration of the rocket?

A book rests on a horizontal table. The Earth pulls down on the book with a gravitational force (weight). According to Newton’s Third Law, what is the reaction force to this weight?

Aristotle believed that the 'natural state' of an object was to be at rest. How does Newton's First Law modify this view?

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9.8

m s−2

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True

False

The book pushing down on the table

The friction between the book and the table

The table pushing up on the book

The book pulling up on the Earth

It suggests that force is required to maintain a constant velocity.

It states that being at rest and moving at a constant velocity are equivalent states when the net force is zero.

It states that objects prefer to be in motion rather than at rest.

It agrees that all objects eventually stop without intervention.

4.8\ \text{m s}^{-2}

9.8\ \text{m s}^{-2}

5.0\ \text{m s}^{-2}

14.8\ \text{m s}^{-2}