Force, Mass , Acceleration
Types of forces
Forces on systems
Earth's surface forces
net force
100
What is the unit for force
Newton or N
100
What is a contact force?
a. A force that can act on an object without touching it
b.A force that pulls objects towards each other
c.A force that arises when two objects are in physical contact with each other
d. A force that happens when two surfaces rub against each other
c
100
Find the weight of a 5kg rock on Mercury with a gravitational pull of 3.59m/s/s.
17.95kg
100
Weight is equal to mass. TRUE or FALSE
False
100
With unbalanced forces, the object will move in the direction of the _________ force.
A. smaller
B. larger
C. Equal
B
200
If the mass increases what happens to the acceleration of an object given the same force is applied
Decrease
200
Which force resists motion when two surfaces are in contact?
Friction
200
Hooke's Law describes the behaviour of which kind of material under tension?
a.plastic
b.elastic
c. metals
d.nonmetals
b
200
The weight of an object _________ as it moves away from the center of Earth.
decreases
200
what is the net force?
40N
300
A 50 kg skater pushed by a friend accelerates 5 m/sec2. How much force did the friend apply?
100N
300
What force keeps a string hanging on a ceiling
Normal Force
300
A spring has a spring constant of 330 N/m. How far is the spring compressed if 150 N of force are used?
0.45 m
300
What is the weight of a 121kg person?
1185.8N
300
what is the net force and direction?
0N
400
Trevor shakes his favorite chew toy with a force of 43 N at an acceleration of 0.18 m/s2. What is its mass? Round answer to the second decimal place.
238.39kg
400
Give an example of a noncontact force
Magnetic force, gravity
400
A block of wood with mass of 12kg is held by a rope and is hanging at a metal rod. what is the tension force?
117.6N
400
A bag of apples is placed on a spring balance. Which gives a reading of 68N. What is the mass of the apples?
9.6kg
400
Find the net force and direction
1N right
500
Calculate the acceleration of a 1500 g object that is moved with a force of 300N.
200m/s2
500
Tension
500
two boxes with mass 1 of 5kg and the other box with mass 2 of 7kg is connected by a rope and they are being pulled along the floor. If the Horizontal force applied to the 7kg box is 30N. What is the acceleration of the box?
2.5m/s2
500
A 10 Kg stone located on the surface of Jupiter has a weight of 230N .Calculate the gravitational field g of this planet? make sure to include unit in your answer
23N/kg
500
What holds planets' orbit around the sun
Gravity or gravitational force