Unit 2 Test

Mass

The amount of matter or “stuff” in an object

Weight

Thea measure of the force of gravity acting on a body

Mass - universal measurement of matter

Weight - measurement of gravitational force dependent on location

What is the difference between mass and weight?

Friction

The force that resists the motion of an object

opposite

Friction works in the ___________ direction as the motion of an object

Inertia

An object’s tendency to resist a change in motion

Train; it has a greater mass

Which has more inertia: a train or a car? Why?

kg

What is the unit of mass?

N (w)

What is the unit of weight?

N (F)

What is the unit of force?

m/s²

What is the unit of acceleration?

Newton’s First Law of Motion

An object at rest stays at rest and an object in motion stays in motion unless acted on by an unbalanced force

Inversely Proportional

the value of one quantity increases and another will decrease

mass (m) and acceleration (a)

Which pair of variables has an inversely proportional relationship in F=ma?

Directly Proportional

One quantity goes up by a certain percentage, the other quantity goes up by the same percentage

force (F) and acceleration (a)

Which pair of variables has a directly proportional relationship in F=ma?

The acceleration will increase by three times (triple)

What happens to the acceleration of an object if you increase the force by 3 times?

The acceleration will increase by 2 times (double)

What happens to the acceleration of an object if you lower the mass by ½?

100N, Newton’s Third Law

Teddy swings his bat and hits a ball with a force of 100N. The ball hits the bat with a force of ________. Why?

3N to the initial force of 17N

A 20 Newton force and a 17 Newton force are acting on a block in opposite directions. What additional force must be added to produce equilibrium (no net force)?

Newton’s 3rd Law of Motion

For every action force, there is an equal and opposite reaction force

Neither the car or train; Newton’s 3rd Law

When a train and car collide, which experiences the bigger force? Why?

The car; it has less mass compared to the train

When a train and car collide, which experiences the bigger acceleration? Why?

Red Arrow: Force of Friction (F_f) or Force Applied (F_a)

Green Arrow: Force of Friction (F_f) or Force Applied (F_a)

Purple Arrow: Force of Gravity (F_g)

Blue Arrow: Normal Force (F_n)

Label the diagram with the appropriate forces

Rest

The act of not moving

Motion

Action or process of moving or being moved

Force

A push or pull

Force of Gravity

The downward force that holds all objects on the surface of the Earth

Normal Force

The force something exerts on something else because gravity is pulling it down

Applied Force

A push or pull that is applied to an object by a person or another object

Acceleration

Object’s capacity to gain or lose speed, or change direction

Newton’s 2nd Law of Motion

The force required for a certain object to accelerate depends on the object’s mass