Download Name: Period: Newton`s 2nd Law: Find the missing force 1. A 5 kg

Name:
Period:
Newton’s 2nd Law: Find the missing force
1. A 5 kg box is being pushed across the floor (force diagram pictures below)
a. Calculate FG and FN
b. Write an expression for FNETx
c. The car accelerates at a rate of 1.9 m/s2. What is the net force?
d. If Fapplied is 70 N, what is Ffriction?
2.
In a Physics lab, Ernesto and Amanda apply a 34.5 N rightward force to a 4.52-kg cart to accelerate it across a
horizontal surface at a rate of 1.28 m/s/s. Determine the friction force acting upon the cart.
3.A 5.00 kg rocket is acted upon by an upward force of 59.0 N supplied by its engine.
a) What is the net upward force acting on it?
b) What is its acceleration?
Name:
Period:
3.a. What is the mass of a rocket weighing 196 N?
b.What upward force must be supplied by its thrusters in order to accelerate it upward at 4.00 m/s2?
4.An elevator is moving up at a constant velocity of 2.5 m/s, as illustrated in the diagram below: The man has a mass of
85. kg.
a.
Construct a free-body diagram for the man.
b.
What force does the floor exert on the man?
5.
The elevator now accelerates upward at 2.0 m/s2.
a.
Construct a free-body diagram for the man.
b.
What force does the floor now exert on the man?
Name:
Period:
6.
Upon reaching the top of the building, the elevator accelerates downward at 3.0 m/s2.
a.
Construct a free-body diagram for the man.
b.
What force does the floor now exert on the man?
7. An object is sitting at rest on the table. It has a mass of 2.5 kg. You decide to push down on it with a force of 23 N.
a. What is the net force?
b. Write an algebraic expression for net force
C. Solve for the normal force
Name:
Period:
Topics covered on exam
Review Guide
1. Newton’s Laws
a. Newton’s First Law
i. Inertia
ii. Broom demos
b. Newton’s Second Law
i. Calculating Fnet
ii. Calculating a
iii. Drawing force diagrams to aid in calculating Fnet / a
iv. “Find the missing force”
c. Newton’s Third Law
i. What does it mean?
ii. Be able to state it
2. Force Diagrams
a. Be able to properly label forces (normal, tension, drag, friction, applied, etc.)
b. Be able to draw forces with correct lengths /direction
c. Be able to identify equal / unequal forces
3. Second Law Problems
a. Find the net force given a force diagram and calculate a
b. Given a, calculate all the forces acting on an object