Vocabulary
True or False (+ Explanation)
Forces
Floating & sinking
Circuits
100
What is friction?
A force between two surfaces that are trying to slide past each other.
100
Mass changes as the force of gravity changes.
False. Mass is not influenced by gravity, and therefore does not change.
100
What are the two forces that are present on a still object?
Gravity and normal force
100
Draw a force diagram of a rock sinking.
stronger gravity (down), upthrust (up)
100
Is this a parallel or a series circuit?
series circuit
200
What is weight?
The force of attraction on an object caused by gravity.
200
We use forcemeters to measure mass in grams or kilograms.
False. Forcemeters are used to measure weight in Newtons (N).
200
Name the types of forces (4).
Gravity, normal force, applied force, and friction
200
An object will ________ when the force of upthrust is weaker than the force of gravity pulling it down.
sink
200
Draw the conventional symbols of two 1.5V cells joined together, open switch, motor, bulb.
300
What is weightlessness?
The state of having no weight because there is no gravity
300
Jupiter has a larger mass than Earth. Therefore, the force of gravity is stronger and we would weigh more on Jupiter.
True. The larger the mass, the stronger force of gravity. Jupiter has a much stronger gravitational force than Earth so we would weigh more on Jupiter.
300
What are the five effects of forces?
Making an object move.
Slowing down a moving object.
Stop a moving object.
Change the direction an object is moving in.
Change the shape of an object.
300
An object will ________ when the force of upthrust is stronger or equal to than the force of gravity pulling it down.
float
300
Describe the terms closed loop and open loop.
Closed loop is when all parts of a circuit are connect so the current can flow.
Open loop is when there is a break somewhere in the circuit so the current cannot flow.
400
What is normal force?
A support force; the force that two surfaces exert that keeps them touching but does not let them come apart or press further together.
400
Open switch allows electricity to flow in the circuit because it "opens" the pathway for the current.
False.
Open switch breaks the circuit and stops the flow of electricity (turns it OFF).
400
Draw the force diagram for this image.
Gravitational force (down)
Applied force (push; towards the right)
Normal force (up)
Friction (against applied force)
400
A pair of scissors will sink when placed in a container filled with water. What can you do to make the scissors float?
Draw a force diagram of the scissors floating.
Create a boat with a wide flat surface.
Force diagram: gravity, upthrust, boat, scissors, water container
400
Draw a circuit diagram for this circuit using the conventional symbols. (This is a 3V battery cell.)
3V cell, bulb, and closed switch
500
What is upthrust?
A force which pushes something upwards in water or air.
500
This is the conventional symbol of two 1.5V cells joined together.
False. The conventional symbol for two 1.5V cells joined together has a the center two lines connected.
500
Michael throws a paintball at a wooden fence. The paintball bursts.
What are the 3 effects of forces present in this action?
1. Making an object move by throwing the paintball. 2. Stopping a moving object by hitting the wooden fence. 3. Changing the shape of an object as the paintball bursts.
500
What is another name for upthrust force?
Buoyancy
500
Is this a parallel or series circuit? Will all the bulbs light up in this circuit? Explain why.
Parallel circuit.
No, the middle bulb in this parallel circuit will not light up because there is an open switch that cuts the flow of the electricity.