Physics test

A 28N object is sitting on a desk. what is its mass?

2.86Kg

Which has more inertia? A 20 kg mass or a 10kg mass

20 Kg mass

A 20 N physics textbook rests on a table. What is the force the table exerts on the textbook? A.0 N B.9.80 N C.20 N D.40 N

20N

A 28N object is sitting on a desk. What is its weight?

28N

Which has more inertia? A ping pong ball or a baseball?

A baseball

Which has more inertia? A fast bowling ball or a slow bowling ball?

A fast bowling ball

Which has more inertia? A freight train or a car?

A freight train

Which has more inertia? A rock on the earth or a rock in space?

A rock on the earth

According to Newton's ____ law, an object with no net force acting on it remains at rest or in motion with a constant velocity. A.1st B.2nd C.3rd D.4th

A. 1st law

One object has twice as much mass as another object. The first object also has twice as much _______. A. inertia B. velocity C. gravitational acceleration D. energy

A. Inertia

Because weight is a force, its proper units, as used in physics class are _________. A. Newtons B. Kilograms C.m/s^2 D.m/s

A. Newtons

Compared to its weight on earth, a 75 kg object on the moon will weigh _______. (gravitational acceleration on the moon is 1.67 m/s^s) A. less B. more C. the same D. ten times more

A. less

The normal force is _________. A. the contact force acting perpendicular to the surface B. the contact force acting parallel to a surface C. the gravitational force D. the force opposing the motion

A. the contact force acting perpendicular to the surface

The acceleration of an object is ________. A. equal to the force acting on an object multiplied by the mass of the object B. equal to the force acting on an object divided by the mass of the object C. equal to its weight D. equal to mass divided by the force of the object

B. Equal to the force acting on an object divided by the mass of the object

If you go to the Moon, your ____ will decrease but your _____will remain the same. A.mass, weight B.weight, mass C.height, weight D.weight, height

B. Weight and mass

A physics student hits a softball with a bat. What is the force exerted on the softball by the bat? A. equal in both size and direction to the force exerted on the bat by the softball B. equal in size but opposite in direction to the force exerted on the bat by the softball C. opposite in direction but much smaller than the force exerted by the bat on the ball

B. equal in size but opposite in direction to the force exerted on the bat by the softball

An object following a straight line path at constant speed _______. A. has a net force acting on it in the direction of motion B. has zero acceleration C. must be moving in a vacuum D. has no forces acting on it

B. has zero acceleration

A spaceship in deep space fires its engines for 3 seconds. Which of the following describes its motion at the end of the 3 seconds after the engines are turned off? 20 sec A.It continues to accelerate B.It moves with constant speed C.It moves with increasing speed and then gradually decreases D.It gradually decreases speed

B. it moves with constant speed

A baseball player hits a ball. Which is greater: the force of the bat on the ball or the force of the ball on the bat? What happens to the bat and they ball?

Becomes equal and opposite

A 45 kg object is being pushed with a net force of 500 N. What is its acceleration? A. 4.5 m/s^2 B. 6.5 m/s^2 C. 11 m/s^2 D.45 m/s^2

C. 11 m/s^2

"For every action, there is an equal and opposite reaction" is a statement of which of Newton's Laws of Motion? A.1st B.2nd C.3rd D.4th

C. 3rd law

According to Newton's First Law, a moving object acted on by a net force of zero _______. A.remains at rest B.increases its inertia C.decelerates at constant speed D.moves at a constant rate

D. Moves at a constant rate

When forces are acting on an object are balanced, which characteristic of motion remains constant? A. force B. distance C. displacement D.velocity

D. velocity

What are the units for mass?

Kg

What are the units for acceleration

Meters/second^2

What are the units for force?

Newtons

What are the units for weight?

Newtons

Newtons first law states that an object ____________ - all the above

all the above