Forces Review

Which of the following is the cause of an acceleration or a change in an object’s motion?

speed

inerti

a fo

rce

velocit

y

0% 0%0%0%

1. speed2. inertia3. force4. velocity

Which of the following forces is an example of a field force?

gravit

ational force

fricti

onal force

normal

force

tensio

n

0% 0%0%0%

1. gravitational force2. frictional force3. normal force4. tension

A cart is pushed with an acceleration of 2 m/s2. If µ = 0.5, what does the net force equal?

FA FFr

FA – FN

FA

– FFr 0

0% 0% 0%0%0%

1. FA

2. FFr

3. FA – FN

4. FA – FFr

5. 0

An army ranger is lifted by a cable to a helicopter at a constant velocity?

FT Fg

FT –

Fg

Fg

– FT 0

0% 0% 0%0%0%

1. FT

2. Fg

3. FT – Fg

4. Fg – FT

5. 0

A bike is coasting to a stop. What is the net force equal to?

Grav

itational F

orce Zero

Fricti

onal Force

Norm

al Fo

rce

0% 0%0%0%

1. Gravitational Force2. Zero3. Frictional Force4. Normal Force

Which of the following is the tendency of an object to maintain its state of motion?

accelera

tion

inerti

a fo

rce

velocit

y

0% 0%0%0%

1. acceleration2. inertia3. force4. velocity

An object with a mass of 100kg has what weight in Newtons?

9.8 980 0500

25% 25%25%25%1. 9.82. 9803. 04. 500

With a constant applied force, mass is directly proportional to acceleration. This statement describes which of Newton’s Laws?

1st 2nd

3rd

None of t

he ab...

0% 0%0%0%

1. 1st2. 2nd3. 3rd

4. None of the above

If a nonzero net force is acting on an object, then the object is definitely

at rest.

moving w

ith a co

nstant ..

.

being acce

lerated.

losin

g mass.

0% 0%0%0%

1. at rest.2. moving with a

constant velocity.3. being accelerated.4. losing mass.

Which are simultaneously equal but opposite forces resulting from the interaction of two

objects?

net exte

rnal fo

rces

field force

s

gravit

ational force

s

action-re

action pairs

0% 0%0%0%

1. net external forces2. field forces3. gravitational forces4. action-reaction pairs

What is not true regarding action reaction forces?

They are an applic

ation ..

They act on th

e same ob...

They act on diff

erent ob...

All are tr

ue.

0% 0%0%0%

1. They are an application of Newton’s 3rd Law.

2. They act on the same object.

3. They act on different objects.

4. All are true.

The magnitude of the force of gravity acting on an object is

fricti

onal force

.

weigh

t.

inerti

a.

mass.

0% 0%0%0%

1. frictional force.2. weight.3. inertia.4. mass.

In the terminology “a 500-N block”, the 500-N refers most

specifically to the block's:

mass.

force

.

weigh

t.

None of t

he above.

0% 0%0%0%

1. mass.2. force.3. weight.4. None of the above.

It is generally easier to overcome friction when an object is moving than at rest because …

µk is

greater t

han µs

µs is g

reate

r than µk

Fg in

crease

s when an ob...

Fg d

ecrease

s when an o...

0% 0%0%0%

1. µk is greater than µs

2. µs is greater than µk

3. Fg increases when an object moves

4. Fg decreases when an object moves

As a car coasts on a level road yet slows down, the net force acting on the tires is:

greater t

han the norm

al ...

equal to th

e normal fo

rce...

the norm

al force

times t..

zero

.

0% 0%0%0%

1. greater than the normal force times the coefficient of static friction.

2. equal to the normal force times the coefficient of static friction.

3. the normal force times the coefficient of kinetic friction.

4. zero.

If an object changes its direction of motion:

the m

ass of t

he object h..

the in

ertia of t

he object...

the sp

eed of the object

...

a force

must

have been ...

0% 0%0%0%

1. the mass of the object had to change.

2. the inertia of the object had to change.

3. the speed of the object stays the same.

4. a force must have been applied to the object.

If no forces are acting on an object, its motion will:

continue in

the sa

me dir...

slow down and eventu

all...

continue at t

he same sp

...

continue in

the sa

me dir...

0% 0%0%0%

1. continue in the same direction with the same speed.

2. slow down and eventually stop.

3. continue at the same speed but could change direction.

4. continue in the same direction but could change speed.

If the net force is negative and the speed is positive:

the sp

eed will

decrease

...

the sp

eed will

increase

ov..

the sp

eed will

stay t

he ...

the sp

eed will

immediat

e..

0% 0%0%0%

1. the speed will decrease over time.

2. the speed will increase over time.

3. the speed will stay the same.

4. the speed will immediately drop to zero.

Which of the following will not change as you increase the slope of a ramp?

Norm

al Fo

rce Fgx

coeffi

cient o

f fric

tion Fgy

0% 0%0%0%

1. Normal Force2. Fgx

3. coefficient of friction

4. Fgy

Which of the following about an object on a ramp will increase if you decrease the slope of a ramp?

Fricti

onal Force

Grav

itational F

orce Fgx

Coefficie

nt of F

riction

0% 0%0%0%

1. Frictional Force2. Gravitational Force3. Fgx

4. Coefficient of Friction

What happens to the normal force as the angle of a ramp increases?

Norm

al fo

rce in

crease

s

Norm

al fo

rce decre

ases

Norm

al fo

rce re

mains co...

0% 0%0%

1. Normal force increases

2. Normal force decreases

3. Normal force remains constant

What happens to the coefficient of friction as the angle of a ramp increases?

µ incre

ases

µ decrease

s

µ remains c

onstant

0% 0%0%

1. µ increases2. µ decreases3. µ remains constant

The gravitational force on an object is 98N. What is the object’s mass in kg?

98 9.8 980 10

0% 0%0%0%

1. 982. 9.83. 9804. 10

A 1000kg car is at rest on a slope of angle 10o. What equals the normal force?

Fg

Fg sin

10

Fg co

s10

Fg ta

n10 FFr

0% 0% 0%0%0%

1. Fg 2. Fg sin103. Fg cos104. Fg tan105. FFr

A 1000kg car is at rest on a slope of angle 10o. What equals the frictional force?

Fg

Fg sin

10

Fg co

s10

Fg ta

n10 FFr

0% 0% 0%0%0%

1. Fg 2. Fg sin103. Fg cos104. Fg tan105. FFr