Which of the following is a non-contact force?
A. A volleyball player spiking the ball
B. A person playing the saxophone
C. A ball falling to the ground
D. A bowling ball rolling down the lane
What is C. A ball falling to the ground
-Gravity is creating the ball to fall and gravity is non-contact.
100
Which one of these is not a lubricant?
a. oil
b. peanut butter
c. soap
d. lotion
What is b. peanut butter
Lubricants reduce friction.
100
If a bowling ball and a beach ball are rolling down a hill, which will get to the bottom first and why?
What is the bowling ball because it has more momentum.
100
Every action has an ___________ and ____________ reaction.
What is equal, opposite
100
T/F: An object's weight is the same as it's mass.
What is False: weight is proportional to mass.
200
Which of the following is a contact force?
a. Two magnets attracted to each other
b. an escalator
c. a meteor falling to Earth
d. A dog pulling a rope
What is d. A dog pulling a rope
200
To start to move a box across the floor you have to overcome __________ friction.
What is static
200
T/F: An unbalanced force is in motion and can accelerate by changing the speed or direction of the force.
What is True
200
What are the forces acting on the bike seat, if the action force is you sitting on the bike seat?
What is the reaction force is the bike seat pushing up on you equal to your weight of force down on the seat.
200
Fluid friction between surface and air is called?
What is air resistance: it is an upward force on any falling objects. The more surface area the more air resistance you will have and the slower it will fall.
300
If an arrow is used to represent how much strength a force has, the longer the arrow the ____________ the _________.
a. greater, strength
b. less, force
c. greater, air resistance
d. less, strength
What is a. a. greater, strength
300
To keep an object moving, you can apply a force greater than static friction, which will increase the ___________ friction.
What is sliding friction.
As long as something is sliding the sliding friction does not change.
300
Two parter:
What is the equation for momentum?
What is the equation for force?
What is momentum: P=mv
Force: F=ma
300
Define an elastic collision?
What is A collision in which the objects do not stick together, or they bounce off of each other.
300
Weight is measured in ____________.
A. kilograms
B. pounds
C. newtons
D. scales
What is C. newtons
It is a force so measured in newtons.
400
Force is measured using?
a. kilograms
b. newtons
c. pounds
d. sight
What is b. newtons
400
Mass is measured in?
A. kilograms
B. newtons
C. pounds
D. inches
What is A. kilograms
400
Solve:
Figure out the force of an object with a mass of 18 kg and an acceleration of 6 m/s squared?
What is F=ma
18 x 6 = 108 NEWTONS (b/c it is force)
400
Define what occurs in an inelastic collision? For example, when two trains collide?
What is Objects stick together/continue same momentum
400
A 10 N force is pushing an object to the right and the static friction is pushing back -10 N. What is the net force?
A. 10 N
B. 20 N
C. -20 N
D. 0 N
What is D. 0 N
This means there is no motion.
500
What is the name of a force that opposes motion?
a. air resistance
b. friction
c. surface area
d.gravity
What is b. friction
500
If an astronaut travels from Earth to space, his/her _______ changes, but his/her ________ stays the same.
A. weight, mass
B. mass, weight
C. force, weight
D. weight, force
What is A. weight, mass
500
What is Newton's second law of motion?
What is The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.
(force, mass, and acceleration)
500
What is Newton's third law of motion?
What is When an object applies a force on a second object, the second object applies an equal force in the opposite direction on the first object.
500
If you push a box with a force of 90 N to the right, and your friend pushes the box 70 newtons to the left, what is the net force and direction?