Forces
Net Force
Free-Body Diagrams
Gravity
Friction
100
What is a force?
push or pull.
100
Give an example that best represents balanced forces.
When an object is a rest.
100
Which scenario demonstrate the free-body diagram?
a. an egg is free-falling from a nest in a tree. Neglect air resistance.
b. A book is at rest on a table-top
c. A skydiver is descending with a constant velocity. Consider air resistance.
d. none of these.
b. A book is at rest on a table-top
100
Which statement correctly describes gravity?
a. an attractive force that acts between all objects through contact
b. an attractive force that acts between all objects without contact
c. a repulsive force that acts between all objects through contact
d. a repulsive force that acts between all objects without contact
b. an attractive force that acts between all objects without contact
100
Which is an example of sliding friction?
a. a car’s wheels rolling down the road
b. a bird flying through the air
c. a child applying the brakes on his bike
d. a bowling ball rolling down a lane
c. a child applying the brakes on his bike
200
Forces are classified as:
Contact & Noncontact Forces
200
Based on the tug of war pictured below, what is the net force? The unit must be included within the answer. 
10N
200
Which scenario demonstrate the free-body diagram?
a. an egg is free-falling from a nest in a tree. Neglect air resistance.
b. A book is at rest on a table-top
c. A skydiver is descending with a constant velocity. Consider air resistance.
d. none of these.
a. an egg is free-falling from a nest in a tree. Neglect air resistance.
200
Which refers to the force that one massive object exerts to attract another object?
gravity
200
Which factors can affect the amount of friction acting on an object on a solid surface?
a. the weight of the object and the force of a push
b. the type of surface and the weight of the object
c. the force of a push and the motion of the object
d. the motion of the object and the type of surface
b. the type of surface and the weight of the object
300
Which units are used to measure force?
Newtons
300
Calculate the Net Force from the Free-Body Diagram. Include the direction, unit, and determine if it is balanced or unbalanced.
0N, Balanced
300
Which scenario demonstrate the free-body diagram?
a. skydiver is descending with a constant velocity. Consider air resistance.
b. A football is moving upwards towards its peak after having been booted by the punter.
c. A car is coasting to the right and slowing down.
d. A girl is suspended motionless from a bar which hangs from the ceiling by two ropes.
c. A car is coasting to the right and slowing down.
300
An object in projectile motion will follow which path?
a. curved up from the ground
b. curved down toward the ground
c. straight down toward the ground
d. straight up from the ground
b. curved down toward the ground
300
A person is pushing a box across a table. The measured forces on the box are 10N, 14N, -7N, -10N.
Which force is represented by -7N?
a. force of friction
b. normal force
c. force of gravity
d. push force
a. force of friction
400
Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?
a. Fp
b. Ff
c. FN
d. Fg
C
400
Calculate the Net Force from the Free-Body Diagram. Include the direction, unit, and determine if it is balanced or unbalanced.
5N, to the left.
400
Which scenario demonstrate the free-body diagram?
a. A football is moving upwards towards its peak after having been booted by the punter.
b. A car is coasting to the right and slowing down.
c. A girl is suspended motionless from a bar which hangs from the ceiling by two ropes.
d. A force is applied to the right to drag a sled across loosely-packed snow with a rightward acceleration.
d. A force is applied to the right to drag a sled across loosely-packed snow with a rightward acceleration.
400
Which factors affect the gravitational force between two objects?
mass and distance
400
Which type of friction acts on an object that is not moving?
static friction
500
Which statement describes the force diagram?
a. The forces are balanced.
b. The box will move to the right.
c. The box will move to the left.
d. The forces are unbalanced.
a. The forces are balanced.
500
Unbalanced, because the net force is greater than 0N.
500
Which scenario demonstrate the free-body diagram?
a. skydiver is descending with a constant velocity. Consider air resistance.
b. A football is moving upwards towards its peak after having been booted by the punter.
c. A car is coasting to the right and slowing down.
d. A girl is suspended motionless from a bar which hangs from the ceiling by two ropes.
a. skydiver is descending with a constant velocity. Consider air resistance.
500
________ is the force of gravity that pulls you back to the Earth.
Free Fall
500
A tuna fish body is streamlined to reduce friction. Which type of friction should the fish over come?
fluid friction