Which of the following scenarios demonstrates Newton's 2nd Law? A cyclist is launched forward when the bicycle is stopped by the corner of a side walk. A box sliding on the floor slowly comes to a rest due to friction. A planet exerts an attractive force on all objects on its surface. A person feels a push back when they push on a wall.

A fisherman in a boat is using a “10-lb test” fishing line.This means that the line can exert a force of 45 N without breaking (1lb=4.45 N) (a) How heavy a fish can the fisherman land if he pulls the fish up vertically at constant speed? (b) If he accelerates the fish upward at 2.0 m/s2 what maximum weight fish can he land? (c) Is it possible to land a 15-lb trout on 10-lb test line? Why or why not?

Which of the following observations would be adequately explained by Newton's third law?   Question 5 options:   1)  When turning a corner, a passenger in a car feels pushed against the door.   2)  The friction of a surface causes a sliding object to come to rest.   3)  A car's tires slip on an ice-covered surface.   4)  One skater pushes against another and both move off in opposite directions.   5)  The Earth is held in orbit around the Sun by a gravitational force of attraction.

In the classic 1950 science-fiction film Rocketship X-M, a spaceship is moving in the vacuum of outer space, far from any star or planet, when its engine dies. As a result, the spaceship slows down and stops. What does Newton’s first law say about this scene?

Imagine a landing craft approaching the surface of Callisto, one of Jupiter’s moons. If the engine provides an upward force (thrust) of 3260 N, the craft descends at constant speed; if the engine provides only 2200 N, the craft accelerates downward at 0.39 m/s2. (a) What is the weight of the landing craft in the vicinity of Callisto’s surface? (b) What is the mass of the craft? (c) What is the magnitude of the free-fall acceleration near the surface of Callisto?

To understand Newton's 3rd law, which states that a physical interaction always generates a pair of forces on the two interacting bodies. In Principia, Newton wrote:To every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts. (translation by Cajori) The phrase after the colon (often omitted from textbooks) makes it clear that this is a statement about the nature of force. The central idea is that physical interactions (e.g., due to gravity, bodies touching, or electric forces) cause forces to arise between pairs of bodies. Each pairwise interaction produces a pair of opposite forces, one acting on each body. In summary, each physical interaction between two bodies generates a pair of forces. Whatever the physical cause of the interaction, the force on body A from body B is equal in magnitude and opposite in direction to the force on body B from body A.Incidentally, Newton states that…

A certain car (Mazda Miata) has a mass of 1080 kg and can go from zero to 26.8 m/s (0 to 60 mph)in 7.9 seconds. What magnitude of net force must act on the car to cause this?

A flea jumps by exerting a force of 1.10 x 10-5 N straight down on the ground. A breeze blowing on the flea parallel to the ground exerts a force of 0.660 x 10-6 N on the flea. Find the direction and magnitude of the acceleration of the flea if its mass is 6.10 x 10-7 kg. Do not neglect the gravitational force. (Assume that the breeze blows in the +x-direction and that the +y-direction is up.) magnitude direction m/s² o counterclockwise from the +x-axis

The amusement park ride shown above takes riders straight up a tall tower and then releases an apparatus holding seats. This apparatus free-falls back to Earth and is stopped safely right above the ground. Which of the following indicates the magnitude of the gravitational force exerted on a rider of mass m on the way up and on the way down?