Physics Unit Assessment Review

Physics Unit Assessment Review

Use this help you study/practice for the Unit Assessment

Multiple Choice

A race car traveled 6000 meters (6 Km) in 60 seconds. What is the car's speed?

• 100 m/sec

• 3.14 m/sec

• 1 Km/sec

• 20 Km/sec

Calculating Speed

• Speed = distance/time

• Or s=d/t

• This formula will be given on the assessment

Multiple Choice

Newton’s first law of motion states that, unless acted on by an __________ force, an object at rest stays at rest and an object in motion stays in motion at a constant velocity.

• balanced

• unbalanced

• equal

• none of the answers are correct

Multiple Select

Newton's first law of motion is also called the law of ___________

• physics

• velocity

• speed

• inertia

Multiple Choice

Newton’s first law of motion states that, unless acted on by an unbalanced force, an object at rest stays at ________ and an object in motion stays in motion at a constant velocity.

• motion

• acceleration

• rest

• a constant speed

Multiple Choice

Newton’s first law of motion states that, unless acted on by an unbalanced force, an object at rest stays at rest and an object in motion stays in ___________ at a constant velocity.

• motion

• rest

• acceleration

• stopping motion

Newton's 1st law of Motion

Newton’s first law of motion states that, unless acted on by an unbalanced force, an object at rest stays at rest and an object in motion stays in motion at a constant velocity.

This law is also called the Law of Inertia

Multiple Choice

In the diagram above, the block will move [direction] (up/down/left/right) with the force of [number] Newtons.

• Up, 7

• left, 2

• right, -4

• down, 3

Multiple Select

In the picture, the forces acting on the box are

• balanced

• unbalanced

Force Diagrams (Free - Body Diagram)

• First, look at the direction of the forces

• 2nd, look at the forces on either side of the box

• 2 N right and 2 left

• These forces are in opposite directions - so we subtract them

• 2 N - 2N = 0 N (Balanced force)

Forces cont.

• Now, look at the up and down forces

• 2N Up, and 5 N down (5 is the higher number - Box will move down)

• They are in opposite directions so SUBTRACT! 😀

• 5 N - 2N = 3N Unbalanced(Doesn't equal 0)

Multiple Choice

Newton’s second law of motion says that the acceleration of an object depends on the ____________ of the object and the amount of force applied.

• mass

• force

• weight

• acceleration

Multiple Choice

Newton’s second law of motion says that the acceleration of an object depends on the mass of the object and the amount of ____________ applied.

• mass

• force

• acceleration

Multiple Choice

If a cart with a mass of 15 kg accelerates at 3 meters per second squared, how many Newtons of force will it have?

• 60 N

• 45 N

• 30 N

• 5 N

Multiple Choice

Engineers want a racecar to have as ___________ mass as possible. A car with less mass requires less force to accelerate at the same rate as a car with more mass. So if two cars have the same engine, the car with less mass can accelerate more quickly than the car with more mass.

• little

• much

Multiple Choice

Engineers want a racecar to have as little mass as possible. A car with less mass requires ______force to accelerate at the same rate as a car with more mass. So if two cars have the same engine, the car with less mass can accelerate more quickly than the car with more mass.

• less

• more

Multiple Choice

Engineers want a racecar to have as little mass as possible. A car with less mass requires less force to accelerate at the same rate as a car with more mass. So if two cars have the same engine, the car with less mass can accelerate ________ quickly than the car with more mass.

• less

• more

Newton's 2nd law of Motion

• The law states that Force = Mass x acceleration or F=m x a

• So, the Newton’s second law of motion says that the acceleration of an object depends on the mass of the object and the amount of force applied.

• The smaller the mass of an object, the less force is needed to make the object speed up or slow down (accelerate)

Multiple Choice

Newton's Third Law states that when one object applies a force to a second object, the second object applies an _________ and _______________force to the first object.

• equal, opposite

• smaller, weaker

• larger, stronger

• unequal, in the same direction

Multiple Choice

Ouch! Suppose you bumped your 2 kg hand against the edge of a table with a force of 8 Newtons. Your hand hurts because according to Newton’s third law of motion, the table exerts an equal and opposite force on your hand. The force of _______ exerted by the ________ causes your hand to hurt.

• 2N, floor

• 6 N, cat

• 8 N, table

• 0 N, table

Newton's 3rd law of Motion

• "Every action has an equal and opposite reaction"

• If push on the floor with a force of 16 N, the floor pushes back with force of 16 N.