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Physics Ch. 5 Test

force a push or pull that always acts on an object
acceleration a change in a moving object's speed or direction
friction a force that always acts on oppose motion
mass a measure that does not change when an object's location changes
weight the measure of gravitational force
velocity the distance and direction traveled over time
gravity the force of attraction between two objects
What is an object that appears to stay in place that helps you detect motion in another object? A. newton B. lubricant C. black hole D. reference point D
Which is an example of friction that is helpful? A. car engine parts wearing out B. tires moving a car forward on a road C. holes developing in your socks D. erosion of soil by wind B
To calculate an object's acceleration, you need to know A. distance traveled and speed B. starting point, ending point, and object's mass C. starting velocity, final velocity, and time it takes to change velocity D. average speed and distance C
The gravitational pull is greater between two objects that A. have greater masses B. have rougher surfaces C. are farther apart D. are moving at greater speed A
What is the net force on an object when you combine a force of 10N north with a force of 5N south? A. 5N south B. 15N north C. 50N north D. 5N north D
Mass is A. different on the moon than on Earth B. a measure of gravitational force C. a measure of the amount of matter D. measured in newtons C
Dividing the total distance traveled by the total time is how to calculate A. average speed B. average velocity C. average acceleration D. average motion A
The difference between speed and velocity is that A. velocity involves time, while speed does not B. speed involves time, while velocity does not C. velocity has direction, while speed does not D. speed has direction, while velocity does not C
To produce change in motion, a force must be a(n) A. balanced force B. unbalanced force C. frictional force D. gravitational force B
When a mover puts furniture on a dolly with wheels, which type of friction is the mover using to make his job easier? A. static friction B. sliding kinetic friction C. rolling kinetic friction D. gravitational friction C
Friction occurs because of A. the roughness of an object's surface B. only the weights of any two objects C. only the masses of any two objects D. unbalanced forces A
A hiker's velocity begins at 1.8m/s uphill and changes to 1.5m/s uphill. How do you know that the hiker has a negative acceleration? A. his direction changes B. his direction was unchanged C. his speed increased D. his speed decreased D
In which of the following is a skater NOT accelerating? A. going straight while speeding up B. going straight at a constant speed C. making circles at a constant speed D. going straight while slowing down B
A student has a weight of 420N on Earth. What is the student's weight on the moon? (moon's gravity=1/6 of Earth's gravity) A. 70N B. 2,520N C. 70Kg D. 2,520Kg A
An unbalanced force can cause an object's motion to change by A. starting but not stopping motion B. starting or stopping motion C. stopping but not starting motion D. changing direction or speed only B
The law of universal gravitation says that gravitational force is A. related to mass and distance B. related to weight and distance C. related to mass and friction D. related to weight and friction A
Any change in position over time is an example of ___. motion
The newton is the SI unit of ___. force
The speed of an object in a particular direction is ___. velocity
A force that always acts to oppose motion is ___. friction
An object's ___ can change with its location. weight
Describe two differences between mass and weight. Mass is the measure of matter in an object and stays constant with location. Weight is the gravitational force on an object and changes with location.
Describe how to determine average speed. Divide distance by time average speed = d/t
Describe both speed and velocity, and state the differences between the two. Speed is the distance something travels and the time it takes to get to a certain distance. Velocity is speed with direction and cannot change direction.
Describe how unbalanced forces affect both moving objects and nonmoving objects. They can cause a moving object to move faster or slow down and eventually stop.
What would you call a building if you compared it with a moving student? A. reference point B. compass C. ruler D. beacon A
When something changes position, what is it doing? A. being static B. being a reference point C. being lubricated D. moving D
What two things does speed depend on? A. velocity and friction B. velocity and time C. distance and friction D. distance and time D
What is the SI unit for speed? A. kilogram B. newton C. m/s D. m/s/s C
What is a way to reduce friction? A. wear batting gloves to bat B. press harder while sanding wood C. push harder while cleaning D. wax skis before skiing down a slope D
A force that holds objects to Earth's surface is called ___. gravity
The combination of all forces acting on an object is called ___. net force
A combined force that causes something to move is called ___. unbalanced force
A combined force that does not cause something to move is called ___. balanced force
What changes when gravitational force changes? weight
The amount of matter in an object is called ___. mass
If you move to Jupiter, your mass would be ___. unchanged
If you move to Jupiter, your weight would be ___. changed
Your speed is not changing, but your direction is changing. You are still ___. accelerating
If a driver's acceleration is positive, then the driver's velocity is ___. negative
A change in motion is caused by a(n) ___. unbalanced force
A unit for force is a(n) ___. newton
The force that pulls everything toward Earth's center is Earth's ___. gravity
A unit of mass is ___. Kg
A force that opposes motion between two surfaces is ___. friction
Friction is greater when surfaces have more ___. roughness or hills
Created by: itslizzie143