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Force & Laws of Motion

Total questions: 25

Worksheet time: 16mins

Name
Class
Date
1.

In which direction and with how much force will an object move if you push to the left with 15N of force and your friend pushes to the right with 5N of force?

a)

up with 10N of force

b)

down with 5N of force

c)

left with 10N of force

d)

right with 10N of force

2.

Which of these is evidence that an unbalanced force is acting on an object?

a)

The mass of the object is changing

b)

The object continues moving in a straight line

c)

The object remains at rest

d)

The motion of the object is changing

3.

Stacy is rowing a boat. She wants the boat to move forward. According to Newton's Third Law, in which direction should she move her paddle in the water?

a)

Backwards

b)

Above her head

c)

Forward

d)

East

4.

Forces that are equal in size but in opposite directions are called ______________ forces.

a)

Strong

b)

Crazy

c)

Balanced

d)

Unbalanced

5.
Which type of force(s) will cause a change in an object's motion?
a)
gravity
b)
speed
c)
balanced forces
d)
unbalanced forces
6.
An object will not have any inertia if it is _?
a)
accelerating
b)
moving in a circle
c)
in space
d)
all objects have inertia
7.
An empty truck and a fully loaded truck are next to each other at a traffic light. When the light turns green, the lighter truck increases speed more quickly. Which law best explains this situation?
a)
Newton's first law
b)
Newton's second law
c)
Newton's third law
d)
Conservation of momentum
8.
  A basketball with a mass of 0.60 kg is accelerated with a force of 10.8 N.  If resisting forces are ignored, what is the acceleration of the basketball to the nearest m/s2?
a)
0.06 N
b)
6.48 m/s2
c)
18 N
d)
18 m/s2
9.
The diagram below shows two different forces acting on a cyclist riding a bicycle.
The total mass of the cyclist and the bicycle is 100.0 kg.  Based on this information, what is the acceleration of the cyclist?
a)
0.66 m/s2 backward, because the force of the air slows the cyclist down
b)
0.66 m/s2 forward, because the applied force is greater than the force of the air
c)
2.3 m/s2 backward, because the forces are opposite and not equal
d)
2.3 m/s2 forward, because the cyclist's inertia is greater than the force of the air
10.
Rockets are launched into space using jet propulsion where exhaust accelerates out from the rocket and the rocket accelerates in an opposite direction.
a)
The Law of Inertia
b)
The Law of Acceleration
c)
The Law of Conservation of Momentum
11.
Which one needs a greater net force to move, a kilogram of feathers or a kilogram of iron? 
a)
feathers 
b)
iron
c)
same
d)
depends on their friction
12.
Calculate the Net Force. 
a)
60N, Left 
b)
40N, Right 
c)
0N
d)
60N, Right
13.
Are forces balanced or unbalanced when a marble speeds up rolling down a ramp?
a)
Balanced
b)
Unbalanced
14.
A .030 kg bullet is fired from a gun with a speed of 350 m/s. If the gun has a mass of 0.9 kg, What is the recoil speed of the gun?
a)
11.7 m/s
b)
9.0 m/s
c)
10.5 m/s
d)
10 m/s
15.
A 9 kg blob moving at 5 m/s collides and sticks to a second blob with a mass of 5 kg. If the two bobs stick together, what will the velocity of the two blobs move at?
a)
3.57 m/s
b)
3.2 m/s
c)
10.0  m/s
d)
9.0  m/s
16.

The momentum of an object is the sum of its mass and its velocity.

a)

True

b)

False

17.

Which scenario would most likely occur when a cue ball strikes a pool ball that is at rest?

a)

The cue ball will stop making and also be at rest.

b)

The pool ball will accelerate in the same direction as the cue ball was initially moving.

c)

The cue ball will bounce back from the pool ball around the same velocity.

d)

The pool ball will accelerate to a velocity greater then the cue ball moving.

18.

A mass has a momentum of 50 kg*m/s, when its velocity doubles what happens to its momentum?

a)

The momentum doubles.

b)

The momentum quadruples.

c)

The momentum is halved.

d)

The momentum stays the same.

19.
In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other.  The orange cart has a velocity of 2 m/s and the blue cart has a velocity of -1m/s.  The carts stick together when they collide.  Calculate their final speed.
a)
0.5 m/s
b)
1.0 m/s
c)
0.33 m/s
d)
0.67 m/s
20.

What is the SI unit for momentum?

a)

g m/s

b)

kg m/s

c)

m/s

d)

kg/s

21.

Will a momentum of -22 kg m/s north be the same as 22 kg m/s south?

a)

yes

b)

no

22.

If two objects collide or explode, they experience

a)

the same force for the same amount of time.

b)

different forces for the same amount of time.

c)

different forces for different amounts of time.

d)

the same force for different amounts of time.

23.

Two objects are moving towards each other as shown in the diagram. The magnitude of p1 and p2 are 20 and 10 kg.m/s, respectively. What is the total momentum of the two objects?

a)

30 kg.m/s right

b)

10 kg.m/s right

c)

10 kg.m/s left

d)

30 kg.m/s left

24.

If the collision is elastic, then both momentum and kinetic energy of the system are conserved.

a)

True

b)

False

25.

The momentum of an object is the sum of its mass and its velocity.

a)

True

b)

False

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