WorksheetsContact Forces Unit Review
Total questions: 47
Worksheet time: 28mins
This force diagram shows
A balanced force
An unbalanced force right
An unbalanced force left
A net force of 20 N
If the man is pushing with a force of 400 N and it is an unbalanced force, which direction will the car move?
to the right
to the left
What is the Net Force of this picture?
4700 N --->
4700 N <-----
300 N ----->
300 N <------
An elastic material can change shape when ________ is exerted on it.
a force
a moment
an acceleration
a speed
This determines how well the material will resist deformation and return to its normal size or shape after a force has been applied to it.
texture
elasticity
strength
uniformity
A baseball player bats a ball with a force of 1,000 N. The ball exerts a force against the bat of...
Less than 1, 000 N
1,000 N
More than 1,000 N
What two factors affect an object's kinetic energy?
area and volume
mass and weight
weight and height
mass and speed
Increasing an object's mass will increase its kinetic energy.
true
false
Increasing an object's speed will increase its kinetic energy.
false
true
Increasing an object's kinetic energy will increase its peak forces when the object collides with another.
true
false
True or False: When two pool balls collide, neither ball changes shape.
True
False
What is true about the breaking point of a cracker vs a piece of bread?
The breaking point of the cracker and bread are equal.
The breaking point of the cracker is greater than that of the bread.
The breaking point of the bread is greater than that of the cracker.
What is the point to which objects can spring back to their original position after a collision?
Breaking point
Elastic Limit
Forces
Kinetic Energy
What happens if an object goes past its elastic limit?
It bounces back.
It reaches its breaking point!
Nothing.
What is transferred in a collision?
Forces
Speed
Mass
Energy
All solid objects bend or change shape when any amount of contact force is applied to them. What does the amount the object deforms depend on?
Type of material
Thickness
Shape
An increase in kinetic energy due to a speed or mass increase will increase the size of the peak forces between the objects in a collision.
True
False
Which sentence best explains the statement and why you would not sink into the sand?
Flat shoes are better than heels because you get less sand on your toes.
Pressure distribution is less for flat shoes.
Pressure distribution is greater for flat shoes.
The smaller the surface areas, the less is the pressure. So heels create less pressure.
Why won't you sink in mud if you wear boots instead of barefeet?
The surface area is larger spreading out the peak force.
The air inside the boots helps you float.
The peak force is increased by the boots.
If both forces are going in the same direction you should______ those forces
Add
Subtract
Divide
Multiply
When forces are going in the opposite direction of each other you should do what do find the net force
Subtract
Add
Divide
Multiply
Limitations on a design or project are called...
Criteria
Constraints
Trade off
Research
Problem Statement
"The vehicle must travel the farthest distance possible" is an example of...
Criteria
Constraints
Trade off
Research
Problem Statement
"The vehicle needs to go straight" is an example of...
Criteria
Constraints
Trade off
Research
Problem Statement
"The vehicle needs to be able to move itself" is an example of...
Criteria
Constraints
Trade off
Research
Problem Statement
"We only have certain materials that we can use" is an example of...
Criteria
Constraints
Trade off
Research
Problem Statement
It must travel 3 meters
It must drive in a straight line and stay in the 24" wide lane.
What is one word to describe criteria?
Limitations
Requirements
Togetherness
Complete
What is another word for constraints?
Requirements
Complete
Ability
Limitations
When designers make compromises during the Engineering Design Process, this is called _______________.
Additional criteria
More constraints
Increased efficiency
A trade-off
"The next model for a product must be in production in three months" is an example of a...
Criteria
Constraint
Trade off
Research
Problem Statement
A speedboat is not permitted to go faster than 100 knots in a lake. Therefore, the company decides to redesign the throttle so it cannot exceed 95 knots. This is an example of:
constraint.
criteria.
trade-off.
design challenge.
"We cannot work with a partner" is an example of...
Criteria
Constraints
Trade off
Research
Problem Statement
Design and build something that can carry a Ping-Pong ball from the top of a zip line string to the bottom in four seconds (or less!). Your materials are cardboard, paper cup, tape, paperclip, glue, weights. You will have 30 minutes to build then we will test.
What are the criteria for this project?
Design and build something that can carry a Ping-Pong ball from the top of a zip line string to the bottom in four seconds (or less!).
Your materials are cardboard, paper cup, tape, paperclip, glue, weights. You will have 30 minutes to build then we will test.
Design and build something that can carry a Ping-Pong ball from the top of a zip line string to the bottom in four seconds (or less!). Your materials are cardboard, paper cup, tape, paperclip, glue, weights. You will have 30 minutes to build then we will test.
What are the constraints for this project?
Design and build something that can carry a Ping-Pong ball from the top of a zip line string to the bottom in four seconds (or less!).
Your materials are cardboard, paper cup, tape, paperclip, glue, weights. You will have 30 minutes to build then we will test.
Another name for air resistance is...
Buoyancy
Streamline
Gravity
Drag
Air resistance pushes against falling
objects and __________________.
Speeds them up
Keeps them afloat
Slows them down
Spins them
How can wind affect the velocity of an airplane?
If it is blowing from the right side, it could push the plane off direction to the left
If it is blowing from the front (headwind), it would slow the plane down
If it is blowing from the back (tailwind) it would speed the plane up
It would always result in a plane crash and the passengers needing to be rescued.
What direction does air resistance act relative to motion?
in the same direction
in the opposite direction
need more information
depends on the force
