Question 1

A 20 N horizontal force is applied to a 4.0 kg box. Friction is negligible. The box moves a horizontal distance of 3.0 meters. What is the work done by the 20 N force?

Accepted Answer

$60 \ \mathrm{J}$

Question 2

A 30.0 kg box slides up a 12.0 meter long incline at an angle of $30.0^\circ$ above the horizontal. Friction is negligible. What is the change in gravitational potential energy?

Accepted Answer

$2190 \ \mathrm{J}$

Question 3

A 5.00 gram bullet has a velocity of $300 \ \mathrm{m/s}$. It strikes a block of wood and penetrates to a distance of $10.0 \ \mathrm{cm}$. What is the average force of the block of wood on the bullet?

Accepted Answer

$2,250 \ \mathrm{N}$

Question 4

A 20.0 kg box slides up a 12.0 m long incline at an angle of $30.0^\circ$ with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of $10.0^\circ$ to the incline and above the incline. If the incline has a coefficient of kinetic friction of $0.100$, then the increase in the kinetic energy of the box is:

Accepted Answer

$241 \ \mathrm{J}$

Question 5

A 120 N force is applied at an angle of $30.0^\circ$ above the horizontal to a 4.00 kg box. The box moves a horizontal distance of $6.00 \ \mathrm{m}$. What is the change in the kinetic energy of the box?

Accepted Answer

$750 \ \mathrm{J}$

Question 6

A 75.0 kg skier slides down a $75.0 \ \mathrm{m}$ high slope without friction. What is the velocity of the skier at the bottom of the slope?

Accepted Answer

$38.3 \ \mathrm{m/s}$

Question 7

A spring with a spring constant of $8.0 \ \mathrm{N/m}$ is initially compressed $5.0 \ \mathrm{cm}$. The work done as it is compressed another $15 \ \mathrm{cm}$, to a total compression of $20 \ \mathrm{cm}$, is:

Accepted Answer

$0.52 \ \mathrm{J}$

Question 8

A spring-powered dart gun is un-stretched and has a spring constant $150 \ \mathrm{N/m}$. The spring is compressed by $8.00 \ \mathrm{cm}$ and a $5.00 \ \mathrm{g}$ projectile is placed in the gun. What is the maximum height of the projectile when it is shot at an angle of $30.0^\circ$ above the horizontal from the gun?

Accepted Answer

$5.03 \ \mathrm{m}$

Question 9

A $90.0 \ \mathrm{kg}$ person is running up the stairs at $0.500 \ \mathrm{m/s}$. What is the power needed to run up the stairs?

Accepted Answer

$441 \ \mathrm{Watts}$

Question 10

A $2.00 \ \mathrm{kg}$ pendulum bob on a string $1.50 \ \mathrm{m}$ long is released with a velocity of $0.00 \ \mathrm{m/s}$ when the support string makes an angle of $60.0^\circ$ with the vertical. What is the tension in the string at the bottom of the swing?

Accepted Answer

$56.1 \ \mathrm{N}$

Physics Study Guide: Work, Energy, Forces, and Motion

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