May the force be with you
Solutions to the problems
Equations
Physicists dream of pulleys
Elevators are ruined
100

This force keeps Slinky Dog together in the movie Toy Story!

What is spring force

100

The net force of a 60N force directed to the right and a 17N force directed to the left

What is 43N to the right

100

A physics book rests on a bookshelf near the window of the classroom. Write the Fnet equation

What is Fnet = Fn - Fg

100

A 5 kg block is attached to the left end of a string and a 10kg block is attached to the right side of a string. Determine the mass of the system

What is 15kg

100

An elevator is accelerating up, a person feels

Heavier

200

Contrary to it's name, this unique force is associated with the surface of things.

What is normal force

200

A fisherman reels in a bass of 5kg at a rate of 3.0 m/s2 . The force exerted by the fisherman is

What is 15N

200

A box is getting dragged by a string across the floor. Write the Fnet equation for the horizontal component of the motion.

Fnetx = T - Fk

200

A 20kg block is attached to the left side of a string and a 2 kg block is attached to the right side of the string. Determine the magnitude of the acceleration of the system

What is 8.0 m/s2

200

An elevator is accelerating down, a person feels

lighter
300

This force results in a large acceleration on humans but a very small acceleration on the Earth

What is gravitational force

300

A 20kg bucket hangs from a string. Determine the tension

What is 196N upwards

300

A person lays down on their inner spring mattress. Write the Fnet equation for the vertical component of the person.

Fnety = Fsp - Fg

300

A 3.0 kg block is at rest on a frictionless table when it is attached by a string to a 4.0 kg block. The 4.0kg block is allowed to fall from the table. Determine the acceleration of the system.

What is 5.7 m/s2

300

An elevator accelerates up at 18 m/s2. A 75kg man would appear to weigh

2085N

400

This upward directed force keeps a stoplight from falling on to your car!

What is tension

400

A 1000kg car accelerates at a rate of 7 m/s2. The coefficient of friction between rubber and the road is 0.9. Determine the force exerted by the engine to move the car.

What is 7000N

400

A 195kg piano on the ground cannot be pushed to the right by a person. Write the Fnet equation of the horizontal forces acting on the piano

Fnet = Fpush - Fs

400

A 400kg crate is on the left side of a pulley system and a 750kg counterweight is on the right side of a pulley system. Determine the tension in the cable.

What is 5112N


**Acceleration is 2.98 m/s2

400

An elevator accelerates down at 18 m/s2. A 75 kg man appears to weigh

What is 615N

500

Without this force, walking would be impossible

What is friction

500

A 3kg sign is hung outside a restaraunt by two strings. The strings make an angle of 35 degrees to the sign. Determine the tension in each string.

What is 25.6N

500

A 1200kg car is accelerating at 2m/s^2 down the highway. What is minimum static friction coefficient?

What is 0.2


500

A 45kg block is at rest on a table with friction and attached to another block hanging off the edge. The block hanging is allowed to fall. The system accelerates at a rate of 9 m/s2. The coefficient of friction is 0.5. What is the mass of the hanging block?

What is 782kg

500

A 68kg person stands on an elevator. The instant the elevator begins to move, the person feels 35N heavier. What is the acceleration of the elevator.

0.51 m/s2