What is the difference between speed and velocity?
Both are the rate at which something moves, but velocity has direction.
100
There is a relationship between force, mass, and ________.
acceleration
100
Newton’s first law of motion is also called the law of _____.
What is inertia
100
When a kangaroo jumps, the kangaroo’s action force acts on the ground and the reaction force
a. is exerted by the ground.
b. acts on the kangaroo.
c. is greater than the action force.
d. two of the above
100
What is the net force is one force is pushing to the right with
25 newtons and another force is pushing to the left with 25 newtons?
0 newtons
200
What is the difference between positive and negative acceleration?
positive = speeding up
negative = slowing down
200
What net force is required to accelerate a car at a rate of 2 m/s2 if the car has a mass of 3,000 kg?
Force = 6000 Newtons
200
The tendency of an object to resist a change in its motion is called _____.
What is inertia
200
If the following objects are all moving at the same velocity, which of the objects has the greatest momentum?
a. pea
b. marble
c. volleyball
d. bowling ball
200
What is the net force on a box with a force pushing at 30 newtons to the left and a force pushing with 40 newtons to the right? include direction
10 newtons to the right
300
What is the formula for speed?
Speed is distance divided by time
300
What is the mass of a truck if it produces a force of 14,000 N while accelerating at a rate of 5m/s2 ?
2800 kilograms
300
_____ is a force that counters motion whenever two surfaces come into contact.
What is friction
300
When you stand on the floor, the force of your body pushing down on the floor is
a. matched by the floor pushing up on your body.
b. less than the reaction force applied by the floor.
c. a reaction to the floor pushing up.
d. none of the above
300
Give an example of something with balanced forces acting on it.
something sitting still or moving at constant speed.
400
What is the speed of a car that travels 50 miles in .5 hours?
100 miles per hour
400
Any change in velocity for any reason is called _______.
acceleration
400
. Without an unbalanced force acting on it, a moving object will
What is maintain a constant speed
400
Describe an example of an action and reaction that result in motion.
Teacher decides
400
Give an example of unbalanced forces acting on an object.
something must move
500
What is the acceleration of an object that is traveling 5000 m/s and after 60 seconds is going 2500 m/s?
-41.7 m/s/s
500
The greater the mass of an object, the ______ it will accelerate when a given net force is applied to it.
less
500
True or false: If you don’t try to stop a rolling skateboard, it will keep moving forever.
False
500
Compare and contrast action-reaction forces and balanced forces.
Balanced Forces act on same object - cancel each other out
Action/Reaction Forces act on different objects and result in
motion
500
Give an example of an object that has 4 forces acting on it at the same time. Be specific.