Physical Science Ch 1-2

A 1 kg mass at Earth's surface weighs about?

10 N

When a baseball player hits a ball with a force of 1000 N, the ball exerts force on the bat of ?

1000 N

A car has a mass of 1000 kg and accelerates at 2 m/s squared. What is the magnitude of the force exerted on the car?

2000 N

A girl pulls on a 10 kg wagon with a constant force of 30 N. What is the wagon's acceleration?

3.0 m/s squared

If a jaguar sports car accelerates from zero to 100 km/h in 3.0 sec its acceleration is?

33.3 km/h/s

If a ball rolls down an inclined plane and picks up 4 m/s each second it rolls, its acceleration is?

4 m/s squared

One-half second after starting from rest, a freely falling object will have a speed of about?

5 m/s

Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her avg running speed is?

5 yards/ sec

What is the net force acting on a 1-kg ball in free fall?

9.8 N

The person in the middle weighs 440N and the tension in each rope is 460N. What is the weight of the scaffold?

W= 480

When you step off a bus at 10 m/s, your horizontal speed when you meet the ground is?

about 10 m/s

Newton's second law directly involves?

acceleration

Compared with a 1 kg block of solid iron, a 2 kg block of solid iron has twice as much?

all of the above

Whenever one object exerts a force on a second object, the second object exerts a force on the first that ____

all of these answers are correct

An object is at rest. The forces acting on the object____

are all of the above

Which of Newton's laws focuses on inertia, which on acceleration, and which on action-reaction?

first law-inertia second law-acceleration third law--action-reaction

A book rests on a table. The forces acting on the book that keep it motionless are _____

gravity and the support force

The type of science that involves studying the past which can be biased based on a person's worldview is called:

historical or origins science

An educated guess of the cause of a problem that is testable is called a:

hypothesis

After a ball tossed upward leaves your hand, the force of gravity on it

remains constant

The steps of the scientific method are:

state the problem, make observations, propose hypothesis, conduct experiment and draw conclusion, repeat as needed

A sheet of paper can be pulled from beneath a box of cereal without toppling it if the paper is jerked quickly. This best demonstrates that?

the box has inertia

A 10 kg brick and a 1 kg book are dropped in a vacuum. The acceleration of the 10 kg brick is?

the same as that of the 1 kg book