Exam II Review

Lecture 15

Review Problem

Macie pulls a 40 kg rolling trunk by a strap angled at 30° from the horizontal. She pulls with a force of 40 N, and there is a 30 N rolling friction force acting on trunk. What is the trunk’s acceleration?

Slide 5-17

Vector Addition

• Find C = A + B 200 m

450

A

250

B

300

Find T1 and T2

• Mass = 25kg

500650

T1T2

Problem

• 5:24 A 23kg child on slide inclined at 380.• What forces act on child?• Make a free body diagram• Magnitude of normal force?• If the coefficient of static friction is 0.62, will

the child start to slide?

Projectile Motion

• How far down range does the 10kg projectile travel?

400

123m/siv

• Review Session tomorrow, Tuesday, 6:00-8:30pm. I will answer questions. No presentation.