Suppose a 94.5 kg mass is 3.75 m above the ground, and is droppedfrom rest.
a) If there is no friction, at what speed will the mass hit theground?
m/s
b) Suppose the mass now hits the ground at speed 5.72 m/s. How muchwork was done by friction on the mass? (Give the answer as apositive number.)
J
2. In procedure 1: a box of mass M starts from rest at height h,and slides down a frictionless incline.
a) If the mass of the box increases, the acceleration of the box onthe incline
decreases
increases
remains the same
b) Suppose the speed of M at the bottom of the incline was v. Atwhat height would M have to start so the speed of M at the bottomis 2v?
4h
h
between h and 2h
between 2h and 4h
more than 4h
2h
3. In procedure 2: an inclined plane is 120 cm long, and is tippedat angle ? = 10.5o. The 0 cm mark is at the bottom. Photogate 1 isat the 29.3 cm mark, and photogate 2 is at the 62.5 cm mark alongthe track, Assume
- The bottom of the track is at 0 J potential energy.
- The total mass of the cart is 654 g.
- The track is totally frictionless
NOTE: Be careful of units!
a) Find the potential energy of the cart .
- At photogate 1: J
- At photogate 2: J
b) Suppose the cart is released at rest at photogate 2 (the higherpoint on the track). Find the speed of the cart as it passesphotogate 1.
m/s
4. âin procedure 3: a spring is at the bottom of a frictionlessincline. When a box of mass M compresses the spring distance x andis released from rest, the box slides distance d up the incline(measured from where the box is at rest).
a) Suppose a box of mass 2M is used to compress the spring distancex,and is released from rest. The distance the box will slide up theincline is
d/2
between d and 2d
d/4
2d
between d/2 and d/4
between d/2 and d
d
4d
between 2d and 4d
b) Suppose a box of mass M is used to compress the spring distance2x, and is released from rest. The distance the box will slide upthe incline now is
d/2
2d
between d and 2d
between d and d/2
d/4
4d
between d/4 and d/2
between 4d and 2d
d
Suppose a 94.5 kg mass is 3.75 m above the ground, and is droppedfrom rest.
a) If there is no friction, at what speed will the mass hit theground?
m/s
b) Suppose the mass now hits the ground at speed 5.72 m/s. How muchwork was done by friction on the mass? (Give the answer as apositive number.)
J
2. In procedure 1: a box of mass M starts from rest at height h,and slides down a frictionless incline.
a) If the mass of the box increases, the acceleration of the box onthe incline
decreases
increases
remains the same
b) Suppose the speed of M at the bottom of the incline was v. Atwhat height would M have to start so the speed of M at the bottomis 2v?
4h
h
between h and 2h
between 2h and 4h
more than 4h
2h
3. In procedure 2: an inclined plane is 120 cm long, and is tippedat angle ? = 10.5o. The 0 cm mark is at the bottom. Photogate 1 isat the 29.3 cm mark, and photogate 2 is at the 62.5 cm mark alongthe track, Assume
- The bottom of the track is at 0 J potential energy.
- The total mass of the cart is 654 g.
- The track is totally frictionless
NOTE: Be careful of units!
a) Find the potential energy of the cart .
- At photogate 1: J
- At photogate 2: J
b) Suppose the cart is released at rest at photogate 2 (the higherpoint on the track). Find the speed of the cart as it passesphotogate 1.
m/s
4. âin procedure 3: a spring is at the bottom of a frictionlessincline. When a box of mass M compresses the spring distance x andis released from rest, the box slides distance d up the incline(measured from where the box is at rest).
a) Suppose a box of mass 2M is used to compress the spring distancex,and is released from rest. The distance the box will slide up theincline is
d/2
between d and 2d
d/4
2d
between d/2 and d/4
between d/2 and d
d
4d
between 2d and 4d
b) Suppose a box of mass M is used to compress the spring distance2x, and is released from rest. The distance the box will slide upthe incline now is
d/2
2d
between d and 2d
between d and d/2
d/4
4d
between d/4 and d/2
between 4d and 2d
d
