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Unit 4. Forces and Motion
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A box is pushed by two persons. The image shows the forces they produced. How much is their net force? [choices: A. 0 Newtons, B. 40 Newtons, C. 20 Newtons]
B. 40 Newtons
What will be your mass in outer space if your mass on Earth is 45 kilograms? [choices: A. 450 kilograms, B. 0 kilograms, C. 45 kilograms]
C. 45 kilograms
What is the type of force that is produced in this object when you pull it on both sides?
Spring force
A lubricant such as oil makes surfaces slippery. That means it can _____________ the friction between 2 rubbing objects. [choices: A. increase, B. decrease]
B. decrease
What is the name of the force by air particles which fights the pull of gravity on a falling object?
Air resistance force
TRUE or FALSE: The wider a parachute is the slower it is to fall to the ground.
TRUE
TRUE or FALSE: the smoother the surface, the more friction it will produce.
FALSE: the lesser friction it will produce.
What type of force is produced when two objects rub together?
friction
Rubbing two surfaces together produces which type of energy? [choices: A. chemical, B. electrical, C. heat]
C.heat
You blow a pingpong ball and it rolled across the table. Is there work done on the pingpong ball? [Yes or No]
YES
What type of energy is inside this cake? [ choices: A. chemical, B. mechanical, C. Thermal]
A. chemical
The picture shows two forces acting on a box in opposite directions. How much will be the net force? [choices: A. 0 Newtons, B. 20 Newtons, C. 4 Newtons]
C. 4 Newtons
If you put a ball on the ground and it does not move, the forces acting on it are ____________ . [choices: A. balanced, B. unbalanced]
A. balanced
The 2 forces acting on an object in opposite directions is called a ___________ .
force pair
What type of force your body produce when you push something? [Choices: A. friction force, B. tension force, C. applied force]
C. applied force
TRUE or FALSE: If your weight on Earth is 650 N, your weight in outer space would be 0 N.
TRUE. You don't have a weight in outer space.
Which among the three is the unit used to measure weight? [grams, newtons, kilograms]
newtons
TRUE or FALSE: Gravity is a kind of energy.
FALSE. It is a kind of force.
The pull of gravity on an object is called ___________ . [Choices: A. weight, B. energy, C. mass]
A. weight
The amount of matter in an object is called ___________ . [Choices: A. force, B. mass, C. weight]
B. mass
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