Forces & Motion – Test 1 Review
A push or pull that acts on an object
force
A change in a moving object’s speed or direction
acceleration
A measure that does not change when an object’s location changes
Reference point
The measure of gravitational force exerted on an object
weight
Speed of an object in a particular direction
velocity
Distance an object moved over the time in which the motion took place
speed
The SI unit for force
newton
The combination of all forces acting on an object
Net force
To calculate an object’s acceleration, what formula would you use?
Acceleration = Vf – Vi time
What is the net force on an object when you combine a force of 10N north with a force of 5N south
5 N north
Distance time
speed
What is the difference between speed and velocity?
Velocity is in a certain direction, speed is not
To produce a change in motion, a force must be ___________
unbalanced
When the net force is equal to 0N, the forces are _________
balanced
____________ forces always cause a change in speed, direction, or both
unbalanced
Does a force applied always cause motion?
No – only if the force is unbalanced
Forces always come in ________
pairs
It takes 5 seconds for a dog to run 80 meters. What is it’s speed?
16 m/s
A pig runs 84 meters in 7 seconds. What is it’s speed?
12 m/s
A track star runs the 100 meter dash in 10 seconds. What is his speed?
10 m/s
A crocodile moves 18 meters, and is traveling at 6 m/s. How long did it take him?
3 seconds
A plane traveled for 2.5 hours at a velocity of 1200 km/hr. What distance did it travel?
3000 km
A plane taking off reaches it’s takeoff velocity of 75m/s after 5 seconds. What is it’s acceleration?
15 m/s/s
A ball rolling down a hill accelerates from 3 m/s to 34.5 m/s in 9 seconds. What is it’s acceleration?
3.5 m/s/s
If a ball is dropped and falls for 10 seconds, how fast will it be going?
98 m/s/s
A car rolls down a hill for 6 seconds – if the car was going 20 m/s at the beginning of the hill, what is it’s final velocity?
78.5 m/s