Question 1

A 211 student, who is initially at rest, wants to catch a Frisbee. When the Frisbee passes over her head in a straight line at a speed of $$4.0\ \mathrm{m/s}$$, she runs after it in the same direction as the Frisbee, maintaining a constant acceleration of $$2.0\ \mathrm{m/s^2$}. $$The Frisbee is distancing itself at $$4.0\ \mathrm{m/s}. $$How long will it take the student to catch the Frisbee? (Neglect vertical motion of the Frisbee.)

Accepted Answer

$$4.0\ \mathrm{s}$$

Question 2

Which of the following graphs best represents the position $$x of $$the student and the Frisbee as a function of time $$t if $$both start at the same location? The student starts at rest and the Frisbee moves at constant velocity.

Accepted Answer

Graph (a): Both lines start at the same point, Frisbee is a straight line, student is a curve starting below and catching up.

Question 3

Which of the following statements best describes the motion of an object that has a constant net force acting on it?

Accepted Answer

Its acceleration must be in the same direction as the force.

Question 4

A car accelerates from rest at a constant rate of $$3.0\ \mathrm{m/s^2$}$$ for $$5.0\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

$$v = 15\ \mathrm{m/s}$$

Question 5

A ball is thrown straight up with an initial velocity of $$12\ \mathrm{m/s}. $$What is the maximum height it reaches? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$h = 7.3\ \mathrm{m}$$

Question 6

A runner moves with a constant velocity of $$5.0\ \mathrm{m/s}$$ for $$10\ \mathrm{s}. $$What distance does the runner cover?

Accepted Answer

$$50\ \mathrm{m}$$

Question 7

A cyclist starts from rest and accelerates uniformly to a speed of $$8.0\ \mathrm{m/s} in$$ $$4.0\ \mathrm{s}. $$What is the cyclist's acceleration?

Accepted Answer

$$2.0\ \mathrm{m/s^2$}$$

Question 8

A stone is dropped from a height of $$20\ \mathrm{m}. $$How long does it take to reach the ground? (Neglect air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.02\ \mathrm{s}$$

Question 9

A car travels at $$20\ \mathrm{m/s}$$ for $$5.0\ \mathrm{s}$$ and then at $$30\ \mathrm{m/s}$$ for another $$5.0\ \mathrm{s}. $$What is the average speed for the entire trip?

Accepted Answer

$$25\ \mathrm{m/s}$$

Question 10

A projectile is launched horizontally from a $$45\ \mathrm{m}$$ high cliff with a speed of $$10\ \mathrm{m/s}. $$How far from the base of the cliff does it land? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$30.4\ \mathrm{m}$$

Kinematics and Newton's Laws: Exam Study Notes

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