Download Newton`s Laws of Motion Practice Test General Physics

Newton’s Laws of Motion Practice Test
General Physics
1. Draw force diagrams for each of the objects described and shown below. Label the forces and use the
length of the line to represent the relative magnitude of each force. Use arrows to show the directions of
velocity and acceleration where appropriate. ( ------- v ------- a). State if the forces are balanced or
unbalanced.
a. a turkey sleeps on a branch
b. a bucket of water is pulled
up a well at constant speed
c. an applied force causes a bowl of
chili to accelerate across a table.
2. You are driving home with a large pizza (dinner) on the passenger seat of your car. A squirrel runs across
the road in front of the car, so you apply the breaks suddenly. The pizza falls to the floor of your car.
Explain the motion of the pizza as it relates to the law of inertia. (The pizza doesn’t fly off the seat. Newton’s 1st law.)
3. The forces acting on an object are balanced. Describe the motion of the object. (velocity and acceleration)
4. The forces acting on an object are unbalanced. Describe the motion of the object (velocity and acceleration)
5. Match the situation with the description of the forces acting on the object. (you will use one twice)
Situation
a. A car is parked in a lot.
b. A cargo ship is pulled at constant speed by a tugboat.
c. A skydiver slows down when her parachute opens.
d. A boy’s toe breaks because he kicked a rock.
Forces acting on the object
1. Forces are not balanced, Fnet is not 0 N,
so the object accelerates.
2. Forces are balanced. Fnet = 0 N, a = 0 m/s2
3. When two objects interact, they apply the
same size force on each other, in opposite
directions.
6. Find the net force acting on the object. Determine the motion of the object and represent it with velocity
and acceleration arrows. Find the net force and acceleration for each object.
FN = 78.4 N
Ff = 25 N
Fpush = 46 N
8 kg
Fg = 78.4 N
7. A car has a mass of 825 kg. Draw the forces acting on the car as it is at rest.
Calculate the weight of the car.
8. Identify the units used for each quantity listed below:
Time
distance
velocity
acceleration
mass
force
weight
9. What is the difference between mass and weight? How is weight calculated?
10. What is inertia? What determines how much inertia an object has? Does velocity affect an object’s inertia?