forces
Which of the following is an example of exerting a force?
a.a child running through a field
b.a train speeding down a track
c.a carpenter hammering a nail
d.an airplane soaring through the sky
a carpenter hammering a nail
The tendency of an object to resist change in its motion is known as ____.
a.mass
b.inertia
c.force
d.balance
b.inertia
Which of the following is an example of rolling friction?
a.your shoes on a sidewalk as you walk
b.bike tires on the road as you ride
c.a boat on the water as it sails
d.two hands rubbing together
b.bike tires on the road as you ride
Speed equals distance divided by ____.
a.time
b.velocity
c.size
d.motion
a.time
The product of an object’s mass and velocity is called its ____.
a.inertia
b.momentum
c.acceleration
d.force
b.momentum
Balanced forces acting on an object ____.
a.always change the object’s motion
b.sometimes change the object’s motion
c.never change the object’s motion
d.are not related to motion
c.never change the object’s motion
The greater the mass of an object, ____.
a.the easier the object starts moving
b.the greater its inertia
c.the more balanced it is
d.the more space it takes up
b.the greater its inertia
Air resistance is a type of ____.
a.motion
b.acceleration
c.velocity
d.friction
d.friction
When you know both the speed and direction of an object’s motion, you know the _____.
a.average speed of the object
b.acceleration of the object
c.distance the object has traveled
d.velocity of the object
d.velocity of the object
The SI unit for force is the ____.
a.newton
b.meter
c.kilogram
d.pound
a.newton
What happens when two forces act in the same direction?
a.they cancel each other out
b.the stronger one prevails
c.they add together
d.their sum divided by two is the total force
c.they add together
The achievement of lifting a rocket off the ground and into space can be explained by ____.
a.Newton’s first law
b.Newton’s second law
c.Newton’s third law
d.The law of conservation of momentum
c.Newton’s third law
In physical science, a push or a pull is called a(an) ____.
a.force
b.acceleration
c.inertia
d.motion
a.force
To determine the acceleration rate of an object, you must calculate the change in speed during each unit of ____.
a.velocity
b.time
c.motion
d.deceleration
b.time
If you know the distance an object has traveled in a certain amount of time, you can determine ____.
a.the size of the object
b.the speed of the object
c.the location of the object
d.the acceleration of the object
b.the speed of the object
The force that one surface exerts on another when the two rub against each other is called ____.
a.friction
b.acceleration
c.inertia
d.gravity
a friction
It is rare for any motion to ____.
a.stay the same for very long
b.change quickly
c.increase in velocity
d.decrease in speed
a.stay the same for very long
If speed is measured in kilometers per hour and time is measured in hours, the unit of acceleration is ____.
a.hours
b.kilometers per hour
c.kilometers per hour per hour
d.kilometers
c.kilometers per hour per hour
If a bicyclist travels 30 kilometers in two hours, her average speed is ____.
a.30 km/h
b.60 km/h
c.15 km/h
d.2 km/h
c.15 km/h
Any force that causes an object to move in a circle is called a (an) ____.
a.balanced force
b.unbalanced force
c.gravitational force
d.centripetal force
d.centripetal force
Which of the following is the correct equation for acceleration?
a. a= initial speed - final speed / time
b. a= time/final speed minus initial speed
c. a= final time- initial time x time
d a= final speed - initial speed / time
d a = final speed- initial speed/ time
Average speed is ____.
a.equivalent to velocity
b.the rate at which an object is moving at a given instant
c.the rate at which a slope changes
d.the total distance traveled divided by the total time
d.the total distance traveled divided by the total time
In an acceleration graph showing speed versus time, a straight line shows the acceleration is ____.
a.decreasing
b.increasing
c.changing
d.constant
d.constant