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Your Phun Physics Teacher

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Forces Concepts Math Misc.

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Row 1, Col 1

30 N (up)

A book sits on a table and applies

a force of 30N to the table

(down). How much force is

applied by the table on the book?

1,2

True

True or False: Weight is

equal to the force due to

gravity acting on an

object.

1,3

.5kg x 9.8m/s² = 4.9N

A 0.5kg pear falls from a

tree. Calculate the force

acting on the falling pear.

(Ignore air resistance.)

1,4

True; Force has both magnitude

(amount) AND direction.

True or False: Force is

a vector quantity.

2,1

5N

A force of 15N and a force

of 20N are acting on an

object in opposite directions.

The net force is…

2,2

Acceleration is the same, 9.8 m/s².

Which has a greater

acceleration due to gravity, a

tennis ball or a steel ball of

the same size?

2,3

m=(90N)/(9.8m/s²)

=9.2kg

What’s the mass of a

bicycle that weighs 90N?

2,4

9.8 m/s²

A ball is thrown straight up.

At the top of its path, the

ball’s acceleration is…

3,1

True; if there was a net force

acting on the object, then that

object would have to be accelerating.

True or False: If an object is

moving with constant

velocity, then the object has

no net force acting on it.

3,2

Neither! Their masses are the same.

Which has the greater

mass, 20kg of feathers or

20kg of bricks?

3,3

Fnet=(5kg)(4m/s²)

=20N

An object with a mass of 5kg

accelerates at 4m/s². What is

the net force applied?

3,4

Which ball has a greater

force due to gravity, a tennis

ball or a steel ball of the

same size?

The steel ball.

Force due to gravity = (mass)(9.8 m/s2)More mass means more force due to gravity

4,1

(kg) x (m/s²)

What two units, when

multiplied together, equal a

Newton?

4,2

True.

Fbug = Fwindshield

mbug abug = mwindshield awindshield

True or False: A bug hits a car

windshield. The acceleration of

the bug is much greater than the

acceleration of the windshield.

4,3

a=(100N)/(40kg)

=2.5m/s²

A 40kg object

experiences 100N of net

force. What is the object’s

acceleration?

4,4

False:

Objects moving at a constant

velocity have a net force of zero.

True or False: Objects move

only when a net force is

exerted on them.

5,1

False:

The acceleration doubles.

True or False: If the force

acting on a cart doubles, the

cart’s acceleration

quadruples.

5,2

The acceleration is cut in half

(half as much acceleration).

A truck is moved by a force.

Suddenly, a concrete block is

dropped onto the truck so its

mass doubles. What happens to

the truck’s acceleration?

5,3

Fnet = 70N-10N = 60N

m=(60N)/(4m/s²)

=15kg

A box is being pulled with an

applied force of 70N and there’s a

friction force of 10N. If the

acceleration of the object is 4m/s²,

what is the mass of the box?

5,4

False:

Friction resists an

object’s motion.

True or False: Friction

causes an object to move.