Physical Science: Forces, Motion & Simple Machines Review
Terms
undefined, object
copy deck
- 2
- Which Law? As an ice skater pushes harder with his leg muscles, he begins to move faster.
- Newton
- The English mathematician who used math and hundreds of experiments to find out what makes objects start moving, stop moving, speed up, slow down, and change direction.
- air resistance
- Objects moving through air experience a type of friction called __________.
- fulcrum
- The fixed point that a lever pivots around is called the
- 2
- Which Law? A pitched baseball goes faster than one that is gently thrown.
- compound machine
- A machine that utilizes two or more simple machines is called a
- False
- If you were working in space in a weightless environment, no force would be needed to get an object moving.
- balanced
- Equal forces acting on an object in opposite directions are called _________ forces. This results in NO change in an object's overall motion.
- F = M x A
- The correct formula for Newton's second law of motion.
- 3
- Which Law? A swimmer pushes water back with her arms, but her body moves forward.
- unbalanced
- Unequal forces acting on an object that cause a change in the objects motion are called __________ forces.
- True
- It is more difficult for a 350 lb. lineman to change direction than a 200 lb. receiver.
- inertia
- The tendency of an object to resist any change in its motion.
- changing the amount of force or the distance over which you exert the force or the direction of the force.
- Machines make work easier by
- 1
- Which Law? A mug of coffee that has been set on the dashboard slides off as the car begins to move forward
- Galileo
- The Italian astronomer who questioned the idea that a force is needed to keep an object moving.
- 3
- Which Law? When you are standing up in a subway train, and the train suddenly stops, your body continues forward.
- distance
- Work = force x
- 2
- Which Law? When Bobby, age 5, and his dad are skipping pebbles on the pond, the pebbles that Bobby's dad throws go farther and faster than his.
- levers
- Most machines in your body, which consist of bones and muscles, are
- friction
- The force that one surface exerts on another when the two rub against each other is called _________.
- force
- A _________ is any push or pull.
- 2
- Which Law? After you start up your motorbike, as you give it more gas, it goes faster.
- True
- Inertia does not depend upon speed, but rather upon mass.
- physics
- The study of matter, energy, motion and force is known as
- false
- Objects with more inertia will be easier to move.
- joules
- Work is measured in
- 16
- What amount of force will result from a 2-kg object accelerating at a rate of 8 m/s2? ____ Newtons (type in the number, not the number word
- 3
- Which Law? When you pull back on a canoe paddle, the canoe goes forward.
- 3?
- Which Law? As the fuel in a rocket ignites, the force of the gas expansion and explosion pushes out the bottom of the rocket and pushes the rocket upward.
- kilograms
- force is measured in units called?
- 2
- A net force of 10 N causes a mass to accelerate at a rate of 5 m/s2. What is the mass of the object? _____ kg (type in the number, not the number word)
- gravity
- __________ is the force that pulls objects toward Earth.
- 3
- Which Law? A frog leaping upward off his lily pad is pulled downward by gravity and lands on another lily pad instead of continuing in a straight line.