Researchers often use force plates to measure the forces that people exert against the floor during movement. A force plate works like a bathroom scale, but it keeps a record of how the reading changes with time. Figure P5.64 shows the data from a force plate as a woman jumps straight up and then lands. Figure P5.64 a. What was the vertical component of her acceleration during push-off? b. What was the vertical component of her acceleration while in the air? c. What was the vertical component of her acceleration during the landing? d. What was her speed as her feet left the force plate? e. How high did she jump?
Researchers often use force plates to measure the forces that people exert against the floor during movement. A force plate works like a bathroom scale, but it keeps a record of how the reading changes with time. Figure P5.64 shows the data from a force plate as a woman jumps straight up and then lands. Figure P5.64 a. What was the vertical component of her acceleration during push-off? b. What was the vertical component of her acceleration while in the air? c. What was the vertical component of her acceleration during the landing? d. What was her speed as her feet left the force plate? e. How high did she jump?
Researchers often use force plates to measure the forces that people exert against the floor during movement. A force plate works like a bathroom scale, but it keeps a record of how the reading changes with time. Figure P5.64 shows the data from a force plate as a woman jumps straight up and then lands.
Figure P5.64
a. What was the vertical component of her acceleration during push-off?
b. What was the vertical component of her acceleration while in the air?
c. What was the vertical component of her acceleration during the landing?
d. What was her speed as her feet left the force plate?
SA3. A block is given an initial velocity of 5.00 m/s up a frictionless 20.0° incline. How far
up the incline does the block slide before coming to rest?
SA4. A man is pulling a crate along a concrete floor. This time, let's be specific. The
crate has a mass of 100 kg and the man pulls with a force of 1 250 N. The coefficient of
friction between the crate and the floor is 0.2. What is the acceleration of the crate?
SA5. A horizontal force of 80 N is used to pull a 20 N wooden box moving toward the right
along a horizontal, wood surface as shown.
Calculate the magnitude of the frictional force acting on the box.
Determine the magnitude of the force acting on the box.
Determine the mass of the box.
Calculate the magnitude of the acceleration of the box.
A lamp hangs vertically from a cord in a descending elevator. The elevator has a deceleration of 2.4 m/ s2 before coming to a stop.
A. If the tension in the cord is 89 N, what is the mass of the lamp?
B. What is the tension in the cord when the elevator ascends with an upward acceleration of 2.4 m/ s2 ?
Chapter 5 Solutions
College Physics: A Strategic Approach (3rd Edition)
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