Exam 5: Newtons Third Law of Motion: Action and Reaction

A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is greater than 90°, their resultant is

When a tennis racquet hits a ball,

The airspeed of an airplane is 200 km/h. When it is caught in a 200-km/h crosswind, its speed across the ground below is

A river 100 m wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water leaves the west bank. To land at a point due east of its starting point, the boat must be pointed

Nellie Newton pulls her sled by a rope that is 45° to the horizontal. The horizontal and vertical components of force are

When Nellie hangs suspended from a pair of ropes that are not vertical, the tension in each rope is

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the

To say there is no such thing as only one force means

When a skateboarder pushes on a wall,

If vertically falling rain makes slanted 45° streaks on the side windows of a moving car, the speed of the car

Two equal-size vectors at right angles to each other have a resultant that is

The lift experienced by a helicopter involves an action-reaction pair of forces between the

Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is

Action and reaction pairs of forces

Two people, one twice as massive as the other, attempt a tug-of-war with 12 meters of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of

One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is

When a ball falls downward, it may have a net force

A 10-unit vector at 60° from the vertical has a vertical component with a magnitude

A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is less than 90°, their resultant is

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on an isolated piece of tissue paper with his best punch. You