6. Intro to Forces (Dynamics)

A $1200kg$ car travels at a constant velocity of $15m/s$. What is the net force acting on the car?

In a game, a block is being pushed to the right with a force of $10N$. Which of the following forces applied to the left would result in balanced forces on the block?

(III) A person jumps from the roof of a house 2.8 m high. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.70 m. If the mass of his torso (excluding legs) is 42 kg, find the average force exerted on his torso by his legs during deceleration.

A rocket traveling 1950 m/s away from the Earth at an altitude of 6400 km fires its rockets, which eject gas at a speed of 1200 m/s (relative to the rocket). If the mass of the rocket at this moment is 25,000 kg and an acceleration of 1.5 m/s² is desired, at what rate must the gases be ejected?

Which of the following lists the three basic steps in the NSC collision prevention formula as applied to $N{e}^{1}wton’s$ First and $S{e}^{2}cond$ Laws?

According to Newton's First and Second Laws, what happens to the acceleration $a$ of a car in a frontal collision if the net force $F\_\mathrm{net}$ acting on it is large and acts in the opposite direction of its initial motion?

According to Newton's First Law, when an object is in motion and no net external force acts on it, what will happen to its motion?

A single force with x-component Fₓ acts on a 500 g object as it moves along the x-axis. The object's acceleration graph aₓ versus t) is shown in FIGURE P5.30. Draw a graph of Fₓ versus t.

According to Newton's First Law, an object cannot remain at rest unless which of the following conditions is satisfied?

According to Newton's Second Law, an increase in $F$, not resistance, results in an increase of load.

According to Newton's Second Law, if several objects all have the same mass ($m$) and different net forces ($F\_\mathrm{net}$) are applied to each, which statement is true about their accelerations ($a$)?

Which of the following is an example of an unbalanced force?

If a monkey floating in outer space throws his hat away, the hat and the monkey will both

According to Newton's First Law, will the $velocity$ of a book change as it moves across a surface with no friction and no external forces acting on it?