41 questions
1. The unit for Force is -
Newton
Isaac
Friction
Inertia
1. The graph below shows an object in motion. Once the object was in motion, how many times did it experience an unbalanced force?
0
2
5
12
1. The greater the ________ of an object, the greater its inertia.
Force
Height
Speed
Mass
1. Two movers are working together to move a bedroom dresser. One mover is pulling on the dresser with 17 N and the other mover is pushing the dresser with 23 N. What is the total amount of Net Force they are using to move the dresser?
40 N
0 N
6 N
23 N
1. All objects pull with gravity. Your paper, your house, or even your hair pulls with gravity.
Why is it that objects aren’t floating towards your paper or hair?
All objects have gravity, but there it too much friction for them to move.
All objects are attracted to the center of the Earth because the Earth has so much mass.
There is too much force from the air for objects to move.
Other objects don’t have gravity.
What is Newton’s 1st Law also known as?
Law of Inertia
Law of Gravity
Law of Motion
Law of Momentum
All forces have _________ and _________.
Size and Mass
Size and Direction
Direction and Speed
Size and Speed
In 1971, the Apollo 15 spacecraft landed on the moon. During this mission, astronaut David Scott wanted to see what would happen if he dropped a hammer and a feather from the same height while standing on the moon's surface, which has no air. He performed the experiment, dropping both objects at the same time. What happened?
The hammer and the feather floated away.
The hammer hit the ground as the feather floated away.
The hammer hit the ground first and then the feather hit.
The hammer and the feather hit the ground at the same time.
The skydiver is falling through the air with the chute open to slow down. In which direction is the parachute's force exerted on the skydiver?
Left
Right
Down
Up
The picture shows the distance traveled by four identical toy cars in five seconds. Students used different steel springs to push the cars. Which car's spring applied the least amount of force?
Car 1
Car 2
Car 3
Car 4
Newton's second law explains the relationship between
velocity and speed
balanced and unbalanced forces
force, mass and acceleration
weight, force and gravity
Acceleration of an object
decreases as the mass of the object increases.
increases as the force on the object increases.
is in the same direction as the net force on the object.
all of the above
How much force is needed to accelerate a 270 kg rider on her motor scooter at 4 m/s/s? Hint: Force = Mass x Acceleration
270 N
280 N
800 N
1080 N
Two teams are playing tug-of-war. One team is pulling with 17 N and the other team is pulling with 23 N. What is the total amount of Net Force?
40 N
0 N
6 N
23 N
Acceleration is a change in ___.
Time
Velocity
Distance
Mass
Which is a form of acceleration or deceleration?
a car slowing down at a stop sign
a car waiting at a red light
a car driving down the street at the same pace
a car parked on the street
A marble rolls down a ramp and hits a cup at the end of the ramp. Which size marble will exert the smallest force on the cup it runs into?
small
medium
large
no difference
What is the net force on the box above?
5 N up
5 N down
55 N up
55 N left
What is the net force on the box above?
50 N left
80 N left
110 N left
0 N, balanced
Two rhinos escaped from the zoo and now their keepers must apprehend them and return them to the zoo. If both rhinos have the same mass, what will cause one of the rhinos to have more force making it harder to catch?
Less acceleration
more acceleration
the same acceleration
no acceleration
Newton’s third law of motion states that if a force is exerted on an object, another force occurs that
Is equal in size and opposite in direction
Is in the same direction and size
Is equal in speed and opposite in direction
Is in the same direction and speed
Every year the Cub Scouts have a car derby where the scouts design and build their own car from a block of wood. Before the race, each car is weighed and then raced on identical tracks. Why is it important that the cars weigh about the same?
a more massive car exerts less force on the track, creates less friction, and goes faster
a less massive car exerts less force on the track, creates more friction, and goes faster
a less massive car exerts less force on the track, creates less friction, and goes faster
a more massive car exerts less force on the track, creates more friction, and goes faster
Friction occurs when two surfaces touch and apply _____________ and _______________ forces to slow or stop motion.
equal, speed
equal, opposite
speed, velocity
opposite, velocity
One way to increase friction between objects is to use
wax
water
sand
oil
When you kick a ball in soccer,
the action force is the foot on the ball.
the reaction force is the ball on the foot.
the action is the ball flying away after the foot kicks it.
Both A & B
What is one way to reduce friction?
Apply sand to a surface
Add more mass to the object
Use more force to move the object
Change from sliding to rolling friction
Balanced forces applied to an object
produce a net force of zero.
change the direction of a moving object.
cause an object at rest to start moving.
produce a negative net force.
When a grasshopper leaps from a leaf, the force of the grasshopper pushing against the leaf is equal and opposite to the force of
air resistance on the grasshopper
Earth’s gravity on the grasshopper
the leaf pushing against the grasshopper
the leaf pushing against the air
When a swimmer swims through water,
The action force could be the swimmer’s hands and feet pushing on the water.
The reaction force could be the water pushing on the hands and feet
The net force of the action and reaction is what moves the swimmer forward.
All of the above
A good rule to observe when you are around a swimming pool is “no running.” The wet deck around the pool is very slippery because of
elastic friction
rolling friction
fluid friction
static friction
What type of motion is shown by line segment 3?
A constant speed away from the starting point
An accelerating speed away from the starting point
Stopped
A constant speed returning to the starting point
What type of motion is shown by line segment 4?
A constant speed away from the starting point
An accelerating speed away from the starting point
stopped
A constant speed returning to the starting point
What type of motion is shown by line segment 7?
A constant speed away from the starting point
An accelerating speed away from the starting point
stopped
A constant speed returning to the starting point
Which line segment shows a slow acceleration away from the starting point?
Line segment 1
Line segment 2
Line segment 5
None of the above
Which line segment shows the fastest constant speed away from the starting point?
Line 1
Line 2
Line 3
Line 6
Which of the following measurements could be a velocity?
5 m/s2 North
5 s North
5 m/s North
5 m North
Two escalators move people between floors of a shopping mall. One moves up and the other moves down. They both move at the same rate. Which of the following statements is true?
The escalators have the same velocity but different speeds.
The escalators have different speeds and velocity.
The escalators have the same speed and velocity.
The escalators have the same speed but different velocities.
What is the speed of the object during the time interval of 2.0 to 4.0 seconds?
10 m/s
5 m/s
0.0 m/s
6.5 m/s
You are training to run the 100 m race at a track and field meet. You time yourself, and find that you can run it in 10 seconds. At what speed are you able to run the race? Hint: Speed = Distance ¸ Time
1 m/s
10 m/s
100 m/s
1000 m/s
A unit for speed is
feet/second
meters/second
miles/hour
all of the above
The picture shows an inclined plane that was used to move a heavy box. Which of these does the inclined plane change?
The mass of the box being moved
The amount of force required to move the box
The amount of work required to move the box
The amount of energy required to move the box